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锰氧化合物纳米材料的研究现状及应用
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作者 胡婕 杨俊霞 曾毅 《石油石化物资采购》 2024年第1期40-42,共3页
在纳米技术发展日新月异的今天,纳米材料的应用在各个领域也逐渐渗透开来,成为人们所关注的热点之一。锰氧化物纳米材料,因其独特的结构、卓越的电化学性能、优质的磁性等优点,在催化、新能源存储、自然环境保护等领域显示出广泛且重要... 在纳米技术发展日新月异的今天,纳米材料的应用在各个领域也逐渐渗透开来,成为人们所关注的热点之一。锰氧化物纳米材料,因其独特的结构、卓越的电化学性能、优质的磁性等优点,在催化、新能源存储、自然环境保护等领域显示出广泛且重要的前景。基于此,旨在回顾锰氧化物纳米材料的研究现状,总结其合成方法、结构特点、应用领域以及全球重点领域未来的发展趋势。 展开更多
关键词 锰氧化合物 纳米材料 研究现状及应用
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影响巨磁电阻钙钛矿锰氧化合物居里温度的结构分析 被引量:1
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作者 张栋杰 都有为 《功能材料》 EI CAS CSCD 北大核心 2002年第5期495-496,499,共3页
测定了La1 -xAx(MnB)O3型巨磁电阻钙钛矿化合物在不同组成时的居里温度 ,利用A位离子对晶格能的贡献和B位离子极化力的变化分别对A和B位离子掺杂及A B位离子组成同时变化时钙钛矿的居里温度进行了分析 ,结果与实验一致。
关键词 巨磁电阻 钙钛矿 锰氧化合物 居里温度 结构分析 晶格能 极化
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多孔锰氧化合物的研究进展 被引量:1
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作者 王建芳 刘宗怀 苏智魁 《商洛学院学报》 2008年第5期27-32,共6页
多孔锰氧化合物是一种新型的功能材料,因具有许多优良的性能而被用作分子筛、离子筛、催化剂及二次电池的正极材料等领域。综述了多孔锰氧化合物的结构特征、制备方法及应用,展望了多孔锰氧化合物的开发应用前景,新结构和新特性的多孔... 多孔锰氧化合物是一种新型的功能材料,因具有许多优良的性能而被用作分子筛、离子筛、催化剂及二次电池的正极材料等领域。综述了多孔锰氧化合物的结构特征、制备方法及应用,展望了多孔锰氧化合物的开发应用前景,新结构和新特性的多孔锰氧化合物的开发将是今后的发展方向。 展开更多
关键词 多孔材料 锰氧化合物 制备
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天然锰氧化合物参与环境中有机物迁移转化的研究进展
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作者 张飙 《轻工科技》 2017年第5期90-92,共3页
天然锰氧化合物具有较大的比表面积和相对较高的氧化还原电位。同时在各种自然环境介质中都发现有天然锰氧化合物的存在。天然自然环境中不少有机物的迁移转化过程显然是涉及到了天然锰氧化合物的参与。因此,对自然环境中有机物迁移转... 天然锰氧化合物具有较大的比表面积和相对较高的氧化还原电位。同时在各种自然环境介质中都发现有天然锰氧化合物的存在。天然自然环境中不少有机物的迁移转化过程显然是涉及到了天然锰氧化合物的参与。因此,对自然环境中有机物迁移转化过程中天然锰氧化合物的参与作用的研究对评估有机污染物环境风险和探索有机污染的生成机理都有不小的参考价值。本文对天然锰氧化合物的种类、分布、理化性质以及目前对其参与的一些典型有机污染物迁移转化过程的研究做了简要介绍。 展开更多
关键词 天然锰氧化合物 有机污染物 催化 迁移转化
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钙钛矿型稀土锰氧化合物Nd_(0.5)Sr_(0.4)Pb_(0.1Mn_(1-x)Fe_xO_3中Mn位的Fe替代效应 被引量:10
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作者 鲁毅 李庆安 +1 位作者 邸乃力 成昭华 《物理学报》 SCIE EI CAS CSCD 北大核心 2003年第6期1520-1523,共4页
对Nd0 5Sr0 4Pb0 1 Mn1 -xFexO3系列多晶样品的结构 ,磁和转变特性进行了实验研究 .在x =0 0 0— 0 10的范围内获得了单相样品 ,Fe3+ 的替代并没有引起整个系列的结构变化 ,然而Mn位的掺杂却强烈地抑制了Nd0 5Sr0 4Pb0 1MnO3的... 对Nd0 5Sr0 4Pb0 1 Mn1 -xFexO3系列多晶样品的结构 ,磁和转变特性进行了实验研究 .在x =0 0 0— 0 10的范围内获得了单相样品 ,Fe3+ 的替代并没有引起整个系列的结构变化 ,然而Mn位的掺杂却强烈地抑制了Nd0 5Sr0 4Pb0 1MnO3的铁磁性和金属—绝缘体转变 .在低掺杂情况下 (x≤ 0 0 6)Mn被Fe替代 ,金属—绝缘体转变温度TP 平均下降了 19K ,当x≥ 0 0 8铁磁金属态完全过渡为绝缘态 .这主要归因于Fe3+ 的渗入影响了化合物eg 展开更多
关键词 钙钛矿型稀土锰氧化合物 磁结构 磁性材料 磁转变特性 Nd0.5Sr0.4Pb0.1Mn1-xFexO3 Fe替代效应 双交换作用
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无机层状化合物的剥离技术及应用研究 被引量:9
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作者 侯文艳 刘宗怀 张国春 《材料导报》 EI CAS CSCD 北大核心 2007年第1期110-113,共4页
从无机层状化合物构造出发,描述了不同电性无机层状化合物的结构和剥离方法。在此基础上着重介绍了层状锰氧化物的剥离过程,并利用剥离/重组技术成功合成了一系列纳米级锰氧化物功能材料,所合成的纳米级锰氧化物功能材料期待在选择性吸... 从无机层状化合物构造出发,描述了不同电性无机层状化合物的结构和剥离方法。在此基础上着重介绍了层状锰氧化物的剥离过程,并利用剥离/重组技术成功合成了一系列纳米级锰氧化物功能材料,所合成的纳米级锰氧化物功能材料期待在选择性吸附剂、选择性催化剂及锂离子二次电池正极材料等方面得到广泛应用。 展开更多
关键词 无机层状化合物 锰氧化合物 剥离 重组 纳米功能材料
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Understanding the roles of Brønsted/Lewis acid sites on manganese oxide-zeolite hybrid catalysts for low-temperature NH_(3)-SCR
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作者 Hyun Sub Kim Hwangho Lee +2 位作者 Hongbeom Park Inhak Song Do Heui Kim 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第10期79-88,共10页
Although metal oxide-zeolite hybrid materials have long been known to achieve enhanced catalytic activity and selectivity in NO_(x)removal reactions through the inter-particle diffusion of intermediate species,their s... Although metal oxide-zeolite hybrid materials have long been known to achieve enhanced catalytic activity and selectivity in NO_(x)removal reactions through the inter-particle diffusion of intermediate species,their subsequent reaction mechanism on acid sites is still unclear and requires investigation.In this study,the distribution of Brønsted/Lewis acid sites in the hybrid materials was precisely adjusted by introducing potassium ions,which not only selectively bind to Brønsted acid sites but also potentially affect the formation and diffusion of activated NO species.Systematic in situ diffuse reflectance infrared Fourier transform spectroscopy analyses coupled with selective catalytic reduction of NO_(x)with NH_(3)(NH_(3)-SCR)reaction demonstrate that the Lewis acid sites over MnO_(x)are more active for NO reduction but have lower selectivity to N_(2)than Brønsted acids sites.Brønsted acid sites primarily produce N_(2),whereas Lewis acid sites primarily produce N_(2)O,contributing to unfavorable N_(2)selectivity.The Brønsted acid sites present in Y zeolite,which are stronger than those on MnO_(x),accelerate the NH_(3)-SCR reaction in which the nitrite/nitrate species diffused from the MnO_(x)particles rapidly convert into the N_(2).Therefore,it is important to design the catalyst so that the activated NO species formed in MnO_(x)diffuse to and are selectively decomposed on the Brønsted acid sites of H-Y zeolite rather than that of MnO_(x)particle.For the physically mixed H-MnO_(x)+H-Y sample,the abundant Brønsted/Lewis acid sites in H-MnO_(x)give rise to significant consumption of activated NO species before their inter-particle diffusion,thereby hindering the enhancement of the synergistic effects.Furthermore,we found that the intercalated K+in K-MnO_(x)has an unexpected favorable role in the NO reduction rate,probably owing to faster diffusion of the activated NO species on K-MnO_(x)than H-MnO_(x).This study will help to design promising metal oxide-zeolite hybrid catalysts by identifying the role of the acid sites in two different constituents. 展开更多
关键词 Hybrid metal oxide-zeolite The role of acid sites Manganese oxides Physical mixing Selective catalytic reduction of NOx with NH3
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固相法合成Li_(0.25)Na_(0.75)MnO_2的性能
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作者 杜柯 黄殿华 +1 位作者 胡国荣 彭忠东 《电池》 CAS CSCD 北大核心 2014年第5期264-267,共4页
以Li2CO3、Na2CO3、Mn3O4为原料,采用固相法合成了锂离子电池正极材料Li0.25Na0.75Mn O2。在高温(800℃)下合成的材料具有P2结构、P63/mmc空间群;在较低温度(500-700℃)下合成的材料为具有一定层错的混合结构。在600℃下合成的材料... 以Li2CO3、Na2CO3、Mn3O4为原料,采用固相法合成了锂离子电池正极材料Li0.25Na0.75Mn O2。在高温(800℃)下合成的材料具有P2结构、P63/mmc空间群;在较低温度(500-700℃)下合成的材料为具有一定层错的混合结构。在600℃下合成的材料在2.0-4.8 V充放电,电流为0.1 C时的首次放电比容量为213.3 m Ah/g,电流为0.2 C时循环34次,容量保持率为83%。材料在充放电过程中会发生结构转变,形成与Li2Mn O3结构类似、但更稳定的新相。 展开更多
关键词 锂离子电池 正极材料 固相法 锂钠锰氧化合物
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可用于电池正极材料的Todorokite的性质研究
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作者 刘斌 夏熙 《新疆教育学院学报》 2002年第4期103-111,共9页
从环保和可持续发展的角度 ,二次电池都应该成为开发和研究的重点 ,本文主要介绍可用于二次电池正极材料的Todorokite的性质和合成方法 ,以期在此基础上能尽快将此材料用于实际生产。
关键词 电池正极 材料 性质 二次电池 TODOROKITE Δ-MNO2 电池 晶胞参数 锰氧化合物 锂离子电池
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LiMn_2O_4正极材料高温电化学性能的研究 被引量:8
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作者 李智敏 仇卫华 +1 位作者 曹全喜 张华 《硅酸盐学报》 EI CAS CSCD 北大核心 2004年第1期10-14,共5页
采用固相反应法制备了正极材料LiMn2O4与LiAl0.1Mn1.9O3.9F0.1,对它们进行XRD和SEM测试,并组装成双电极实验电池进行高温电化学性能比较。结果表明:Al3+与F-1掺杂的LiAl0.1Mn1.9O3.9F0.1具有较好的尖晶石结构及微观形貌,不同于LiMn2O4,... 采用固相反应法制备了正极材料LiMn2O4与LiAl0.1Mn1.9O3.9F0.1,对它们进行XRD和SEM测试,并组装成双电极实验电池进行高温电化学性能比较。结果表明:Al3+与F-1掺杂的LiAl0.1Mn1.9O3.9F0.1具有较好的尖晶石结构及微观形貌,不同于LiMn2O4,在高温(55℃)下充放电时,LiAl0.1Mn1.9O3.9F0.1经过15次循环后,容量为110 mAh/g,保持在96%以上,交流阻抗研究也显示了其良好的电化学性能。 展开更多
关键词 锂离子电池 正极材料 化物 锂铝化合物 电化学性能
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Li^+ extraction/adsorption properties of Li-Sb-Mn composite oxides in aqueous medium 被引量:3
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作者 马立文 陈白珍 +1 位作者 石西昌 张坤 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第7期1660-1664,共5页
Series Li-Sb-Mn composite oxides with different Sb/Mn molar ratios were obtained by solid state reaction.Their structure,morphology and Li^+ extraction/adsorption properties were characterized by X-ray diffractometry... Series Li-Sb-Mn composite oxides with different Sb/Mn molar ratios were obtained by solid state reaction.Their structure,morphology and Li^+ extraction/adsorption properties were characterized by X-ray diffractometry (XRD),scanning electron microscopy (SEM) and atomic absorption spectrophotometry (AAS),respectively.XRD and SEM analyses reveal that the crystal of the products transfers from spinel to orthorhombic phase with the increase of molar ratio of Sb to Mn from 0.05 to 1.00.The Li^+ extraction and adsorption experiments for these Li-Sb-Mn composite oxides demonstrate that the composite oxides can all be used as lithium inorganic adsorbents.The acid treated spinel Li-Sb-Mn composite oxide with Sb/Mn molar ratio of 0.05 has a high Li^+ adsorption capacity of 33.23mg/g in lithium solution.The Sb/Mn molar ratio of these Li-Sb-Mn composite oxides should be a crucial factor in determining their structure and Li^+ extraction and adsorption properties. 展开更多
关键词 Li-Sb-Mn composite oxides lithium EXTRACTION ADSORPTION
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Synthesis of K-doped three-dimensionally ordered macroporous Mn_(0.5)Ce_(0.5)O_δ catalysts and their catalytic performance for soot oxidation 被引量:7
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作者 于学华 赵震 +4 位作者 韦岳长 刘坚 李建梅 段爱军 姜桂元 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2015年第11期1957-1967,共11页
A series of K-doped Mn0.5Ce0.5Oδ (K-MCO) catalysts with three-dimensionally ordered macroporous (3DOM) structure and different K loadings were successfully synthesized using simple methods. These catalysts exhibi... A series of K-doped Mn0.5Ce0.5Oδ (K-MCO) catalysts with three-dimensionally ordered macroporous (3DOM) structure and different K loadings were successfully synthesized using simple methods. These catalysts exhibited well-defined 3DOM nanostructure, which consisted of extensive interconnecting networks of spherical voids. The effects of the calcination temperature and calcination time on the morphological characteristics and crystalline forms of the catalysts were systematically studied. The catalysts showed high catalytic activity for the combustion of soot. 3DOM 20% K-MCO-4h catalyst, in particular, showed the highest catalytic activity of all of the catalysts studied (e.g., Ts0 = 331 ~C and Smco2 = 95.3%). The occurrence of structural and synergistic effects among the K, Mn, and Ce atoms in the catalysts was favorable for enhancing their catalytic activity towards the combustion of diesel soot. Furthermore, the temperatures required for the complete combustion of the soot (〈400 ℃) were well within the exhaust temperature range (175-400 ℃), which means that the accumulated soot can be removed under the conditions of the diesel exhaust gas. These catalysts could therefore be used in numerous practical applications because they are easy to synthesize, exhibit high catalytic activity, and can be made from low cost materials. 展开更多
关键词 Three-dimensionally ordered macroporous structureMn0.5Ce0.5Oδ catalystPotassuim dopingSoot combustion
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Removal of tungsten from molybdate solution by Fe-Mn binary oxide adsorbent 被引量:3
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作者 Yun-feng SONG Li-hua HE +1 位作者 Xing-yu CHEN Zhong-wei ZHAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第11期2492-2502,共11页
Considering the different geochemical enrichment behaviors of W and Mo,Fe?Mn binary oxide(FMBO),ferric hydroxide(Fe(OH)3)and manganese dioxide(MnO2)were studied to separate W from molybdate solution,respectively.The e... Considering the different geochemical enrichment behaviors of W and Mo,Fe?Mn binary oxide(FMBO),ferric hydroxide(Fe(OH)3)and manganese dioxide(MnO2)were studied to separate W from molybdate solution,respectively.The experimental results demonstrated that Fe?Mn binary oxide(FMBO)was the most suitable adsorbent for the separation.Under a wide pH(6.9?11.3)region,more than80%W removal efficiency and less than3%Mo loss could be obtained.In addition,the Fe?Mn binary oxide adsorbent can be regenerated by treating with3mol/L NaOH,and the W adsorption efficiency was retained after five adsorption?desorption?regeneration cycles.All these indicate that the Fe?Mn binary oxides have the potential for the separation of W from molybdate solution. 展开更多
关键词 tungsten removal molybdate solution Fe.Mn binary oxide adsorption
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Product selectivity controlled by manganese oxide crystals in catalytic ammoxidation 被引量:1
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作者 Hai Wang Qingsong Luo +4 位作者 Liang Wang Yu Hui Yucai Qin Lijuan Song Feng-Shou Xiao 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2021年第12期2164-2172,共9页
The performances of heterogeneous catalysts can be effectively tuned by changing the catalyst structures.Here we report a controllable nitrile synthesis from alcohol ammoxidation,where the nitrile hydration side react... The performances of heterogeneous catalysts can be effectively tuned by changing the catalyst structures.Here we report a controllable nitrile synthesis from alcohol ammoxidation,where the nitrile hydration side reaction could be efficiently prevented by changing the manganese oxide catalysts.α-Mn_(2)O_(3)based catalysts are highly selective for nitrile synthesis,but MnO_(2)-based catalysts includingα,β,γ,andδphases favour the amide production from tandem ammoxidation and hydration steps.Multiple structural,kinetic,and spectroscopic investigations reveal that water decomposition is hindered onα-Mn2O3,thus to switch off the nitrile hydration.In addition,the selectivity-control feature of manganese oxide catalysts is mainly related to their crystalline nature rather than oxide morphology,although the morphological issue is usually regarded as a crucial factor in many reactions. 展开更多
关键词 Manganese oxide AMMOXIDATION NITRILE AMIDE Crystal structure
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黑化砂对水中铊离子的去除效果研究 被引量:2
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作者 彭进湖 申露威 +2 位作者 钟惠舟 陈丽珠 巢猛 《供水技术》 2019年第6期22-25,共4页
通过滤柱小试研究了黑化砂对水中铊的处理能力,并探讨了去除机理。结果表明,石英砂新砂对铊的去除能力较弱,黑化砂通过物理、化学和生物共同作用,能将0.5μg/L铊降至标准限值(0.1μg/L)以下。黑化物质主要由氧锰化合物构成,滤料使用年... 通过滤柱小试研究了黑化砂对水中铊的处理能力,并探讨了去除机理。结果表明,石英砂新砂对铊的去除能力较弱,黑化砂通过物理、化学和生物共同作用,能将0.5μg/L铊降至标准限值(0.1μg/L)以下。黑化物质主要由氧锰化合物构成,滤料使用年限越长,对铊的去除效果越佳。 展开更多
关键词 黑化砂 化合物
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Synthesis, oxygenation and catalytic performance of manganese complex with p-aminomethyl benzoic acid Schiff base
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作者 刘丰良 李元建 +1 位作者 黄可龙 肖震 《Journal of Central South University of Technology》 EI 2007年第6期793-797,共5页
The amino acid Schiff base complex (Sal-AMBA-Mn) was prepared with p-amino-methylbenzoic acid, salicylaldehyde and Mn(OAc)2·4H2O. Its structures was characterized with IR and UV spectra. Oxygenation mechanism of ... The amino acid Schiff base complex (Sal-AMBA-Mn) was prepared with p-amino-methylbenzoic acid, salicylaldehyde and Mn(OAc)2·4H2O. Its structures was characterized with IR and UV spectra. Oxygenation mechanism of the complex in N, N-dimethylformamide solution was investigated. The results show that lower temperature is in favor of the oxygenation, and energy, enthalpy and entropy are -3.8 kJ/mol, -4.2 J/mol and -161.44 J/(mol·K), respectively. In the presence of the manganese complex, dehydroepiandrosterone acetate is effectively oxidized by molecular oxygen and the corresponding enone 7-ketodehydroepiandrosterone acetate is obtained. The yield is 62.1% when the oxidation is carried out under the reaction conditions of 60 ℃, 2 MPa of O2 pressure, C5H5N as a solvent and molar ratio of the substrate to the complex of 1:10. 展开更多
关键词 amino acid Schiff base manganese complex OXYGENATION catalysis dehydroepiandrosterone acetate aerobic oxidation
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A direct electrochemical route from oxides to TiMn_2 hydrogen storage alloy 被引量:1
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作者 朱靖 戴磊 +2 位作者 于瑶 曹吉林 王岭 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2015年第11期1865-1870,共6页
This study is for investigating the direct electro-deoxidation of mixed TiO2-Mn02 powder to prepare TiMn2 alloy in molten calcium chloride. The influences of process parameters, such as sintering temperature, cell vol... This study is for investigating the direct electro-deoxidation of mixed TiO2-Mn02 powder to prepare TiMn2 alloy in molten calcium chloride. The influences of process parameters, such as sintering temperature, cell voltage, and electrolysis time, on the electrolysis process were examined to investigate the mechanism of alloy formation. The composition and morphology of the products were analyzed by XRD and SEM, respectively. The electrochemical property of TiMn2 alloy was investigated by cyclic voltammetry measurements. The results show that pure TiMn2 can be prepared by direct electrochemical reduction of mixed TiO2/Mn02 pellets at a voltage of 3.1 V in molten calcium chloride of 900 ℃ for 7 h. The electro-deoxidation proceeds from the reduction of manganese oxides to Mn, which is reduced by Ti02 or CaTiOB to form TiMn2 alloy. The cyclic voltammetry measurements using pow- der microelectTode show that the prepared TiMn2 alloy has good electrochemical hydrogen storage property. 展开更多
关键词 Electro-cleoxidationTiMnR alloyCaCl2 meltOxidesHydrogen storage
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Specific Adsorption of Trivalent La, Ce and Y by Soils and Ferro-manganese Oxides and Its Mechanism
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作者 RANYONG LIUZHENG 《Pedosphere》 SCIE CAS CSCD 1992年第1期13-22,共10页
In this paper, the adsorption-desorption variations of trivalent La, Ce, Y and mixed rare earths are discussed. The curves of pH-rare earth element adsorption were very well fitted to the equation: InD =a+b pH. The se... In this paper, the adsorption-desorption variations of trivalent La, Ce, Y and mixed rare earths are discussed. The curves of pH-rare earth element adsorption were very well fitted to the equation: InD =a+b pH. The selectivity of RE (rare earth element) ions by the samples decreased in the following order: Ce> RE> La> Y, but the sequences were: La> Ce> Y on kaolinite and Y> La on amorphous iron oxide. Since the trivalent RE ions existed in the form of RE(OH)2+ in the solutions from pH < 5.45 to 7.0, the ratio of H+ displaced to RE3+ adsorbed in micromole was proposed to be about 2. The specific adsorption mechanism for RE was proposed to be that the RE ions complexed with oxide surface and the ion-surface complex of Ce3+ promoted oxidization on Mn hydroxide. 展开更多
关键词 Ce oxidization rare earth elements SELECTIVITY specific adsorption surface complexation
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La_(0.9)Sr_(0.1) MnO_3薄膜中电流效应研究 被引量:5
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作者 罗炳成 陈长乐 +2 位作者 高国棉 金克新 韩立安 《物理学报》 SCIE EI CAS CSCD 北大核心 2007年第8期4920-4923,共4页
用直流磁控溅射法在(100)LaAlO3衬底上制备了La0.9Sr0.1MnO3薄膜.经退火处理后薄膜的原子力显微镜形貌观测和X射线衍射分析显示具有比较好的质量.电阻率-温度关系表明La0.9Sr0.1MnO3薄膜在281K处发生金属绝缘体转变.电流在0.01—4mA范围... 用直流磁控溅射法在(100)LaAlO3衬底上制备了La0.9Sr0.1MnO3薄膜.经退火处理后薄膜的原子力显微镜形貌观测和X射线衍射分析显示具有比较好的质量.电阻率-温度关系表明La0.9Sr0.1MnO3薄膜在281K处发生金属绝缘体转变.电流在0.01—4mA范围内,薄膜的峰值电阻率随电流增大而减小,在4mA下获得了30.5%的峰值电阻率变化率,并从相分离图像给出了简单解释. 展开更多
关键词 掺杂锰氧化合物 La0.9Sr0.1MnO3薄膜 电流诱导效应 相分离理论
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La_0.7Sr_0.3MnO_3和ZnO异质结的量子铁磁自旋特性
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作者 任韧 秦晓柯 王卫人 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2013年第1期140-144,共5页
采用脉冲激光沉积方法制备La0.7Sr0.3MnO3/ZnO异质结,并对其量子铁磁自旋行为进行研究。发现掺杂浓度可有效调整长程的电子自旋和轨道的相互作用,以及短程小极化子的相互作用程度。LSMO/ZnO异质结构可对能带进行有效剪裁。XRD结果表明,... 采用脉冲激光沉积方法制备La0.7Sr0.3MnO3/ZnO异质结,并对其量子铁磁自旋行为进行研究。发现掺杂浓度可有效调整长程的电子自旋和轨道的相互作用,以及短程小极化子的相互作用程度。LSMO/ZnO异质结构可对能带进行有效剪裁。XRD结果表明,所制样品具有良好的晶格外延特性。伏安特性和阻温曲线显示异质结具有半金属光导特性。在激光光场和磁场下测试La0.7Sr0.3MnO3/ZnO异质结量子铁磁自旋磁阻及光阻。结果发现,样品x=0.3在Tp=250K发生金属绝缘体相变而呈现半金属特性,在Tc=175K温度发生顺磁到反铁磁相变。连续激光下低于峰值温度220K和脉冲激光下低于175K区域激光光场导致光致退磁,光阻增大,在大于峰值温度Tp的高温区出现光阻降低。研究表明,在光场下La0.7Sr0.3MnO3/ZnO异质结特性受界面电子自旋取向和载流子浓度调控,态密度以及自旋轨道作用会导致光致阻抗变化,这些影响与LSMO/ZnO异质结的极化和界面应力所产生的界面态缺陷结构有关。 展开更多
关键词 钙钛矿锰氧化合物 光电阻效应 异质结薄膜 电子自旋 铁磁半导体
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