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The Crystal Structure Study of CaSrFe0.75Co0.75Mn0.5O6−δ by Neutron Diffraction
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作者 Amara Martinson Mandy Guinn Ram Krishna Hona 《Journal of Materials Science and Chemical Engineering》 2024年第1期29-35,共7页
The crystal structure of CaSrFe<sub>0.75</sub>Co<sub>0.75</sub>Mn<sub>0.5</sub>O<sub>6−δ</sub> is investigated through neutron diffraction techniques in this study. The... The crystal structure of CaSrFe<sub>0.75</sub>Co<sub>0.75</sub>Mn<sub>0.5</sub>O<sub>6−δ</sub> is investigated through neutron diffraction techniques in this study. The material is synthesized using a solid-state synthesis method at a temperature of 1200˚C. Neutron diffraction data is subjected to Rietveld refinement, and a comparative analysis with X-ray diffraction (XRD) data is performed to unravel the structural details of the material. The findings reveal that the synthesized material exhibits a cubic crystal structure with a Pm-3m phase. The neutron diffraction results offer valuable insights into the arrangement of atoms within the lattice, contributing to a comprehensive understanding of the material’s structural properties. This research enhances our knowledge of CaSrFe0.75</sub>Co0.75</sub>Mn0.5</sub>O6−δ</sub>, with potential implications for its applications in various technological and scientific domains. 展开更多
关键词 xrd Neutron diffraction Perovskite Oxides Crystal Structure Solid-State Reaction
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Fitting Full X-Ray Diffraction Patterns for Quantitative Analysis: A Method for Readily Quantifying Crystalline and Disordered Phases 被引量:3
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作者 Steve J. Chipera David L. Bish 《Advances in Materials Physics and Chemistry》 2013年第1期47-53,共7页
Fitting of full X-ray diffraction patterns is an effective method for quantifying abundances during X-ray diffraction (XRD) analyses. The method is based on the principal that the observed diffraction pattern is the s... Fitting of full X-ray diffraction patterns is an effective method for quantifying abundances during X-ray diffraction (XRD) analyses. The method is based on the principal that the observed diffraction pattern is the sum of the individual phases that compose the sample. By adding an internal standard (usually corundum) to both the observed patterns and to those for individual pure phases (standards), all patterns can all be normalized to an equivalent intensity based on the internal standard intensity. Using least-squares refinement, the individual phase proportions are varied until an optimal match is reached. As the fitting of full patterns uses the entire pattern, including background, disordered and amorphous phases are explicitly considered as individual phases, with their individual intensity profiles or “amorphous humps” included in the refinement. The method can be applied not only to samples that contain well-ordered materials, but it is particularly well suited for samples containing amorphous and/or disordered materials. In cases with extremely disordered materials where no crystal structure is available for Rietveld refinement or there is no unique intensity area that can be measured for a traditional RIR analysis, full-pattern fitting may be the best or only way to readily obtain quantitative results. This approach is also applicable in cases where there are several coexisting highly disordered phases. As all phases are considered as discrete individual components, abundances are not constrained to sum to 100%. 展开更多
关键词 Full-pattern QUANTITATIVE X-Ray diffraction xrd
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CRYSTAL STRUCTURE OF A LONG-PERIOD ORDERED PHASE IN Fe-C MARTENSITE AND COMPUTER SIMULATION OF ITS ELECTRON DIFFRACTION PATTERNS
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作者 REN Xiaobing WANG Xiaotian +1 位作者 K.SHIMIZU T.TADAKI(National Laboratory of Solid State Microstructures,Nanjing University Nanjing 210093,China)(School of Materials Science and Engineering,Xi’an Jiaotong University Xi’an 710049,China)(Kanazawa Institute of Techn 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第1期23-26,共4页
Different structure models of a long-period ordered phase in Fe-C martenstie formed during aging have been checked by computer simulation of electron diffraction(ED) patterns based on these models.The results showed t... Different structure models of a long-period ordered phase in Fe-C martenstie formed during aging have been checked by computer simulation of electron diffraction(ED) patterns based on these models.The results showed that the simulated ED pattern of γ'-FexC(Ⅱ) model proposed by the present authors is in good agreement with experimentally observed ED pattern.It was also confirmed that the incommensurate superperiod stems from the coexistence of several γ'-Fe_xC(H) phases with different superperiods.The Fe(144)C(24)(Fe6C) model proposed by Uwakweh et al.generated ED patterns remarkably different from the experimental ones. 展开更多
关键词 Fe-C martensite long-period ordered phase crystal structure computer simulation electron diffraction pattern
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Diffraction Pattern of a Rotated Grating
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作者 Pirooz Mohazzabi Daniel J. Mattson Joel Ambriz Ponce Jr 《Journal of Applied Mathematics and Physics》 2019年第8期1870-1876,共7页
Diffraction patterns of a rotated grating are investigated from both theoretical and experimental points of view. It is shown that as the grating rotates, the angle of deviation of each diffracted line relative to the... Diffraction patterns of a rotated grating are investigated from both theoretical and experimental points of view. It is shown that as the grating rotates, the angle of deviation of each diffracted line relative to the incident light goes through a minimum, and that the angle between any two successive diffracted lines goes through a minimum value which is the same for all adjacent diffracted lines. It is also shown that the angle between diffraction lines with n=1 and n=-1 is not sensitive to small variations of the grating from being normal to the incident light. Finally, a method is suggested for determining the line distance of a diffraction grating with high accuracy. 展开更多
关键词 diffraction pattern Rotated GRATING ANGLE of Deviation
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ELECTRON DIFFRACTION PATTERNS ANALYSIS OF PRECIPITATES IN LD_(10) ALLOY
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作者 Jin, Tounan Yin, Zhimin(Department of Materials Science and Engineering,Central South University of Technology, Changsha 410083) 《中国有色金属学会会刊:英文版》 CSCD 1995年第3期119-123,共5页
ELECTRONDIFFRACTIONPATTERNSANALYSISOFPRECIPITATESINLD_(10)ALLOY¥Jin,Tounan;Yin,Zhimin(DepartmentofMaterialsS... ELECTRONDIFFRACTIONPATTERNSANALYSISOFPRECIPITATESINLD_(10)ALLOY¥Jin,Tounan;Yin,Zhimin(DepartmentofMaterialsScienceandEngineer?.. 展开更多
关键词 PRECIPITATE SIMULATED diffraction pattern TRANSFORMATION matrix
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Phase Identification Using Series of Selected Area Diffraction Patterns and Energy Dispersive Spectrometry within TEM
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作者 Kun-Lin Lin 《Microscopy Research》 2014年第4期57-66,共10页
Transmission electron microscopy (TEM) is a very powerful technique for materials characteriza-tion, providing information relating to morphology, composition, and crystal structure. Selected area diffraction patterns... Transmission electron microscopy (TEM) is a very powerful technique for materials characteriza-tion, providing information relating to morphology, composition, and crystal structure. Selected area diffraction patterns (SADPs) are crystallographic data that can be obtained using a TEM in-strument. Conventional identification through SADP/TEM is tricky and tedious, thereby increasing the difficulty of phase identification. To establish a procedure for phase identification of known and unknown phases, in this study we examined two samples: one, a known phase, was Si with alignment;the other, unknown, was the TixOy phase at the 96.4Au-3Ni-0.6Ti interlayer/ yttria-stabilized zirconia (YSZ) interface of a steel/96.4Au-3Ni-0.6Ti interlayer/YSZ joint. The procedures for phase identification of the known and unknown phases are described herein using a series of SADPs and energy dispersive spectrometry within TEM that would be useful for general researchers. 展开更多
关键词 Phase Identification Transmission Electron MICROSCOPY SELECTED Area diffraction pattern Energy DISPERSIVE Spectroscopy
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X-ray Powder Diffraction Pattern of Bi_4(SiO_4)_3
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作者 Hongchao LIU Changlin KUO (Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1997年第2期145-148,共4页
In cooperation with figure-of-merits the Rietveld analysis can appraise both angular and intensity data of powder diffraction. In this work, X-ray diffraction pattern of Bi4(SiO4)3 was redetermined with intensity figu... In cooperation with figure-of-merits the Rietveld analysis can appraise both angular and intensity data of powder diffraction. In this work, X-ray diffraction pattern of Bi4(SiO4)3 was redetermined with intensity figure-of-merits, which qualify agreement between observed and calculated relative intensities. F30 is 158.90 (0.0059, 32), intensity figure of merit Rint is 8.7, I20(17), 8.0. The values of figure-of-merits show that the data of JCPDS cards are distorted. Both the experimental and calculated peak positions and heights are listed in detail. 展开更多
关键词 SiO4 X-ray Powder diffraction pattern of Bi4 BI
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Study on the Diffraction Patterns of α"-Fe_(16)N_2 with Jack-1 and Jack-2 Structural Parameters
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作者 Zhiquan LIU and Douxing LI (Laboratory of Atomic Imaging of Solids, Institute of Metal Research, CAS, Shenyang 110015, China) Xiaolei XU, Liang WANG and Zukun HEI (Institute of Materials and Technology, Dalian Maritime University, Dalian 116026, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2000年第4期362-366,共5页
Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulat... Two body centered tetragonal (bet) crystal structures of α'-Fe_(16)N_2 with x=0.25, z=0.3125 (Jack-1) and x=0.222, z=0.306 (Jack-2) respectively, were analyzed theoretically with EMS software package. The simulation of diffraction patterns indicates that both diffraction patterns of the same axis in these two structures obey bcc extinction rule. The conclusion is also obtained from the analyses of the diffracted waves. α'-Fe_(16)N_2 precipitates in the diffusion layer of ion-nitrided α-iron have been studied with transmission electron microscope (TEM). We have distinctly observed the electron diffraction patterns of α'-Fe_(16)N_2 in [100], [111], [110], [011], [210], [021], [311], [113], [331] and [133] zone axes with perfect symmetry, which indicate the parallel orientation relationship with α matrix:<001>α'//<001>α'// {100}.α'// {100}tα. The analyses of diffraction patterns, which obey bcc extinction rule, verify the bct structure of α'-Fe_(16)N_2 discovered by X-ray diffraction. 展开更多
关键词 Study on the diffraction patterns of JACK N2 with Jack-1 and Jack-2 Structural Parameters FE
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Computer Simulated Diffraction Patterns of Laves Fe_2Mo and μ-Fe_7Mo_6 Phases
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作者 沙维 《Rare Metals》 SCIE EI CAS CSCD 1992年第2期145-146,共2页
关键词 Fe7Mo6 Phases Computer Simulated diffraction patterns of Laves Fe2Mo and MO
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IDENTIFICATION AND SIMULATION OF X-RAY POWDER DIFFRACTION PATTERN
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作者 Shao Fan LIN Xiang Jun LU Wei Fan ZHENG 《Chinese Chemical Letters》 SCIE CAS CSCD 1991年第11期873-876,共4页
A new method for pattern identification and simulation of X-ray powder diffraction data is described, which can give definite phase composition of the unknown rapidly and correctly. The method is implemented in Micros... A new method for pattern identification and simulation of X-ray powder diffraction data is described, which can give definite phase composition of the unknown rapidly and correctly. The method is implemented in Microsoft Fortran 77 for the IBM PC/XT/AT personal computer or their compatibles. 展开更多
关键词 IDENTIFICATION AND SIMULATION OF X-RAY POWDER diffraction pattern
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Method for Signals Detection in Single Crystal Diffraction Patterns through a Diffraction Pattern Indexing Software
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作者 Tania Paola Campos Frias Rafael Vazquez Perez Carlos Elias Omelas-Gutierrez 《Journal of Mechanics Engineering and Automation》 2015年第9期525-532,共8页
The correct use of information in science and technology is very important for its progress. Nowadays, the equipment used for the scientific and technological development provides results that are later interpreted by... The correct use of information in science and technology is very important for its progress. Nowadays, the equipment used for the scientific and technological development provides results that are later interpreted by the researchers, in most of the above mentioned equipment the results are images full of information which has to be analyzed. A powerful stage with multiple benefits in this field is the image pre-processing by means of intelligent systems, which are capable to do image analysis throwing very useful results that enhance the scientific and technological information. There are currently more than 500 functions in the computational vision specialized open source library OpenCV, which associated with the C++ programming language. These functions are used for application development in many areas of computer vision such as products inspection, medical images, safety, user's interfaces, camera calibration, stereoscopic vision and robotics. In this development and research work, by using the available functions and modifying the exposed methods, we present a proposal for signal detection in images originated in the transmission electron microscope (known as diffraction patterns), which are attached to the detailed analysis of crystalline structures used in the study of the materials science, the results show a profit of at least 18% in the detection of signs by means of the method proposed in this work. 展开更多
关键词 diffraction pattern OPENCV DETECTION image pre-processing.
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硼砂煅制工艺优化及质量评价
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作者 杨辛欣 洪禹昕 +5 位作者 张睿 赵晶丽 刘佳 王楚盈 许天阳 于澎 《中成药》 CAS CSCD 北大核心 2024年第2期404-410,共7页
目的 优化硼砂煅制工艺,并对其进行质量评价。方法 以铺设厚度、煅制温度、煅制时间为影响因素,失水率、蓬松度、粉碎率、四硼酸钠含量为评价指标,星点设计-效应面法优化硼砂煅制工艺。采用扫描电镜(SEM)、热重分析(TG)、拉曼光谱、X射... 目的 优化硼砂煅制工艺,并对其进行质量评价。方法 以铺设厚度、煅制温度、煅制时间为影响因素,失水率、蓬松度、粉碎率、四硼酸钠含量为评价指标,星点设计-效应面法优化硼砂煅制工艺。采用扫描电镜(SEM)、热重分析(TG)、拉曼光谱、X射线衍射(XRD),比较硼砂煅制前后质量差异。结果 最佳条件为铺设厚度2 cm,煅制温度365℃,煅制时间100 min。煅制后,硼砂微观形态、成分组成、晶型结构发生变化,失去全部结晶水而转变为非晶体状态。结论 该方法稳定可行,可用于工业大批量生产煅硼砂。 展开更多
关键词 硼砂 煅制工艺 星点设计-效应面法 扫描电镜(SEM) 热重分析(TG) 拉曼光谱 X射线衍射(xrd)
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高强双相钢氩离子抛光EBSD制备研究
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作者 王贞 袁玮 李媛媛 《广州化工》 CAS 2024年第18期86-88,共3页
利用Gatan公司的685型多功能氩离子抛光镀膜仪对铁素体-马氏体高强双相钢EBSD样品进行制备。采用正交法研究了氩离子加速电压、抛光时间以及入射角度对高强双相钢EBSD衍射花样标定率的影响。结果表明,随着加速电压、抛光时间及氩离子入... 利用Gatan公司的685型多功能氩离子抛光镀膜仪对铁素体-马氏体高强双相钢EBSD样品进行制备。采用正交法研究了氩离子加速电压、抛光时间以及入射角度对高强双相钢EBSD衍射花样标定率的影响。结果表明,随着加速电压、抛光时间及氩离子入射角度的增加,可有效地降低砂纸打磨痕迹对EBSD衍射花样标定的影响,且花样标定率明显提高,试样表面平整度增加。 展开更多
关键词 高强双相钢 EBSD 氩离子抛光 衍射花样
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硅灰对水泥胶砂耐硫酸侵蚀性能影响的试验研究
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作者 杨光 滕梦丹 +2 位作者 陈晨 胡家兴 王钟基 《科技通报》 2024年第9期29-35,共7页
为更好地研究硅灰对水泥胶砂耐硫酸侵蚀性能的影响,本文将硅灰按不同配合比进行试验,将水泥胶砂置于pH=1的硫酸侵蚀环境中。通过探究试样的外观、质量损失率、抗压强度损失率、硫酸侵蚀下的生成物、微观结构,并结合相关理论分析了硅灰... 为更好地研究硅灰对水泥胶砂耐硫酸侵蚀性能的影响,本文将硅灰按不同配合比进行试验,将水泥胶砂置于pH=1的硫酸侵蚀环境中。通过探究试样的外观、质量损失率、抗压强度损失率、硫酸侵蚀下的生成物、微观结构,并结合相关理论分析了硅灰对水泥胶砂抗硫酸侵蚀作用的影响。实验研究表明:随着硅灰掺量的增加,水泥胶砂的抗硫酸侵蚀能力增强,XRD(x-ray diffraction)衍射表明,在硫酸侵蚀下表面生成物为二水石膏(CaSO_(4)·2H_(2)O),反应时会消耗Ca(OH)_(2),同时也会产生一定的体积膨胀;SEM(scanning electron microscope)检测表明,掺入硅灰可以提高试样的密实度,从而提高水泥胶砂的抗硫酸侵蚀性能。从宏观和微观角度综合来看,硅灰掺量为15%时的抗硫酸侵蚀性能最好。 展开更多
关键词 硅灰 水泥胶砂 硫酸侵蚀 xrd衍射 SEM检测
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盾构克泥效浆液成分与渗透扩散研究 被引量:2
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作者 陈豪 张康健 +2 位作者 史勇 陈勇 张志强 《科学技术与工程》 北大核心 2024年第16期6916-6926,共11页
盾构隧道近接既有结构施工中常采用克泥效工法辅助控制地层位移。克泥效浆液的流变和渗透扩散性能对盾壳外环向间隙的填充效果具有重要影响。基于克泥效浆液X射线衍射试验(X-ray diffraction, XRD)和黏度试验,研究浆液微观成分及流变性... 盾构隧道近接既有结构施工中常采用克泥效工法辅助控制地层位移。克泥效浆液的流变和渗透扩散性能对盾壳外环向间隙的填充效果具有重要影响。基于克泥效浆液X射线衍射试验(X-ray diffraction, XRD)和黏度试验,研究浆液微观成分及流变性能。基于多孔介质多相流控制方程,建立砂土中克泥效浆液扩散数值模型,分析浆液配比、地层渗透系数和注浆压力对扩散性能的影响。结合宾汉姆流体砂土渗流公式,验证数值模型的可靠性。结果表明:克泥效浆液成分主要为石英、斜长石、伊利石、正长石,且随A液水粉比增加,斜长石含量增加,伊利石含量减小。克泥效浆液的塑性黏度与屈服强度随A液水粉比的减小而增大,宾汉姆模型对浆液流变曲线的拟合优度大于0.95。克泥效浆液在环向间隙中的填充扩散阶段约为25s,而后再向地层中发生渗透扩散,渗透扩散速度远小于填充扩散。随A液水粉比、地层渗透系数、注浆压力增加,克泥效在地层渗透距离均会增加。 展开更多
关键词 克泥效 宾汉姆流体 X射线衍射(xrd)试验 渗透扩散 数值模拟
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亲水胶体对蛋白棒贮藏品质的影响
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作者 薛宇赟 胡雪微 +3 位作者 温成荣 冯丁丁 傅宝尚 祁立波 《食品与发酵工业》 CAS CSCD 北大核心 2024年第21期163-169,共7页
该文研究了3种常见的亲水胶体海藻酸钠(sodium alginate,SA)、羧甲基纤维素钠(carboxy methyl cellulose sodium,CMC-Na)、黄原胶(xanthan gum,XG)的不同添加量(0.3%、0.5%、0.8%,质量分数)对贮藏14 d时蛋白棒的水分含量、水分活度、硬... 该文研究了3种常见的亲水胶体海藻酸钠(sodium alginate,SA)、羧甲基纤维素钠(carboxy methyl cellulose sodium,CMC-Na)、黄原胶(xanthan gum,XG)的不同添加量(0.3%、0.5%、0.8%,质量分数)对贮藏14 d时蛋白棒的水分含量、水分活度、硬度、XRD衍射图谱、老化焓值、微观结构以及感官评定进行分析。结果表明,与空白对照组相比,3种亲水胶体的添加均可赋予蛋白棒面团更柔软的质地,改善蛋白棒的组织结构,提升蛋白棒保水能力,延缓蛋白棒的老化,其中添加CMC-Na效果最佳。添加0.5%(质量分数)CMC-Na的蛋白棒延缓保水能力最佳,减缓硬度降低的效果最显著,且更好地延缓了蛋白棒的老化。 展开更多
关键词 亲水胶体 蛋白棒 水分含量 xrd衍射图谱 微观结构
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应用XRD光谱研究水旱利用方式下盐碱土粘粒矿物演化特性 被引量:8
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作者 张志丹 李桥 +4 位作者 罗香丽 姜海超 郑庆福 赵兰坡 王继红 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2014年第8期2273-2278,共6页
以吉林省典型盐碱土为研究对象,对比分析水田与旱田利用方式下土壤粘粒矿物的组成特征,并利用X射线衍射(XRD)光谱研究两种利用方式下粘粒矿物的演化规律。结果表明,水田利用方式下,盐碱土各项理化性质均优于旱田利用,且水田利用较旱田... 以吉林省典型盐碱土为研究对象,对比分析水田与旱田利用方式下土壤粘粒矿物的组成特征,并利用X射线衍射(XRD)光谱研究两种利用方式下粘粒矿物的演化规律。结果表明,水田利用方式下,盐碱土各项理化性质均优于旱田利用,且水田利用较旱田利用更能促进盐碱土颗粒风化,提高粉粒颗粒含量。水田利用下土壤有强烈的脱钾过程,粘粒矿物的水化程度较高,伊利石结晶度降低。XRD光谱分析表明,两种利用方式下粘粒矿物组成相似,但衍射峰的强度及峰位存在差异。旱田利用的盐碱土粘粒矿物演变过程主要为S/I混层矿物→蛭石,水田方式下演变过程则主要为黑云母→伊利石和S/I混层矿物→蛭石→高岭石;长期水田利用后的盐碱土会出现一类羟基化的"绿泥石化"矿物。研究结果表明水田利用更有助于改善土壤结构,培育高肥力土壤,对盐碱土的改良效果较好。利用XRD光谱分析方法,较为全面的测定了粘粒矿物的各项特性,并针对两种利用方式进行对比分析,是土壤矿物研究的新视角。 展开更多
关键词 xrd光谱 利用方式 盐碱土 粘粒矿物 演化
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不同温度下U_3O_8结构的XRD研究 被引量:5
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作者 张延志 汪小琳 +2 位作者 赖新春 管卫军 王勤国 《核化学与放射化学》 CAS CSCD 北大核心 2003年第2期69-73,共5页
在大气环境及25~850℃条件下,用X射线衍射(XRD)法研究了八氧化三铀(U3O8)的结构变化情况。在实验温度范围内发现,U3O8存在两种相结构,相变温度约为300℃。低于300℃时,U3O8为底心正交结构(Amm2),在300℃附近转变为对称性更高的简单六... 在大气环境及25~850℃条件下,用X射线衍射(XRD)法研究了八氧化三铀(U3O8)的结构变化情况。在实验温度范围内发现,U3O8存在两种相结构,相变温度约为300℃。低于300℃时,U3O8为底心正交结构(Amm2),在300℃附近转变为对称性更高的简单六方结构(P 62m)。在两种相结构稳定的温度范围内,U3O8的点阵参数随温度的增加呈现出规律性变化。 展开更多
关键词 温度 U3O8 结构 X射线衍射法 八氧化三铀 点阵参数
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化学共沉淀法制备磁性活性炭及XRD分析 被引量:7
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作者 刘军 杜茹男 +3 位作者 武一 侯佳男 黄爽 孙剑平 《沈阳建筑大学学报(自然科学版)》 CAS CSCD 北大核心 2017年第2期378-384,共7页
目的优化化学共沉淀法制备磁性活性炭复合材料的最佳制备条件,确定制备高纯度磁性活性炭的主要因素.方法通过控制反应温度、pH值、粉末活性炭不同的投加顺序和不同的搅拌条件制备出相应的磁性活性炭复合材料;并对所制备的磁性活性炭复... 目的优化化学共沉淀法制备磁性活性炭复合材料的最佳制备条件,确定制备高纯度磁性活性炭的主要因素.方法通过控制反应温度、pH值、粉末活性炭不同的投加顺序和不同的搅拌条件制备出相应的磁性活性炭复合材料;并对所制备的磁性活性炭复合材料进行X射线衍射分析表征(XRD),同时利用扫描电子显微镜(SEM)对最佳条件下制备的磁性活性炭材料进行形貌分析.结果制备磁性活性炭的最佳条件为:机械搅拌、反应温度为70℃、pH值为9及滴加沉淀剂(Na OH)前投加粉末活性炭.结论反应温度、pH值、粉末活性炭的投加顺序及搅拌条件是化学共沉淀法制备磁性活性炭的影响因素.在不同的影响因素下粉末活性炭表面负载磁性物质的纯度有一定的差别,其中pH值是决定生成高纯磁性物质的主要因素. 展开更多
关键词 化学共沉淀法 磁性活性炭 X射线衍射 磁性物质
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预处理对海洋黏土矿物XRD测试结果的影响 被引量:4
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作者 王颖 乔淑卿 +3 位作者 葛晨东 石学法 方习生 董智 《海洋科学进展》 CAS CSCD 北大核心 2018年第2期242-252,共11页
海洋沉积物为环境和古气候再造提供良好的地质示踪记录,其中海洋黏土矿物被作为有效指标广泛应用。黏土矿物的预处理方法对其相对组成计算结果影响较大,因此寻找适合不同海域环境简便而有效的预处理方法是黏土矿物研究中很有意义的工作... 海洋沉积物为环境和古气候再造提供良好的地质示踪记录,其中海洋黏土矿物被作为有效指标广泛应用。黏土矿物的预处理方法对其相对组成计算结果影响较大,因此寻找适合不同海域环境简便而有效的预处理方法是黏土矿物研究中很有意义的工作。从渤海中部和印度洋海盆选取2个表层沉积物样品分别代表浅海和深海沉积物,采用不同的预处理方法进行处理。通过其X射线衍射(XRD)测试结果进行对比分析,探索适合特定区域黏土矿物的预处理方法。结果显示,预处理中使用的双氧水、盐酸、醋酸和连二亚硫酸钠-重碳酸钠-柠檬酸钠(DCB)等都对样品黏土矿物分析结果产生一定的影响。若碳酸盐衍射峰不掩盖黏土矿物的信息表达,可不用盐酸或者醋酸去除碳酸盐;DCB方法去除氧化铁时所加试剂会与黏土矿物层间离子发生交换导致数据失真,因此建议一般不使用;去除有机质能促使黏土矿物更好的分散,且质量分数为10%的H_2O_2为最佳。 展开更多
关键词 黏土矿物 有机质 碳酸盐 氧化铁 X射线衍射
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