The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission ...The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission scanning electron microscopy（FE-SEM）.The effect of ferric oxide impurities in coal gangue was studied.The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process.In the oxidation experiment,the existence of ferric oxide decreases the oxidation resistance of SiAlON.The reason is that the impurity causes the formation of a liquid phase at a higher temperature.At 1423-1623 K,the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou＇s model.A fair agreement is found between theoretical calculations and the experimental data.展开更多
New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure ...New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure of Sr0.6Bi0.4FeO2.7has been determined by X-ray single crystal diffraction,and the data of neutron powder diffraction collected at both room temperature and elevated temperature(380℃).The compound Sr0.6Bi0.4FeO2.7 crystallizes in the cubic space group of Pm3m with Z=1,a=3.9330(6) at room temperature,a=3.9498(6)A at 380℃.The magnetic structure from the neutron powder diffraction data collected at room temperature is consistent with a simple G-type antiferromagnetism and has a magnetic moment of 4.98 μB per Fe atom.The structures of Sr1-xBixFeO3-y with x other than 0.4 were also refined from the X-ray powder diffraction data.The data were consistent with a tetragonal cell when x=0.1,a rhombohedral cell when x= 0.9,and a cubic cell for x=0.2～0.8.From single crystal X-ray diffraction data,Ba1.5Pt0.5Mn2O6 crystallizes in hexagonal space group of P63mc with a= 5.7722 (6),c=4.4504(9),V=128.42(2),Z=1.The Sr(1-x)BixFeO(3-y)are found to be a good electronic and ionic conductor.展开更多
为了研究复方白头翁散超微粉对貉部分生化免疫指标及抗氧化功能的影响,试验选择80只45日龄体重相近的断奶仔貉,随机分成2组,每组40只;Ⅰ组(对照组)饲喂基础日粮,Ⅱ组(试验组)在基础日粮中添加1%复方白头翁散超微粉方剂,试验期为10周;Ⅰ...为了研究复方白头翁散超微粉对貉部分生化免疫指标及抗氧化功能的影响,试验选择80只45日龄体重相近的断奶仔貉,随机分成2组,每组40只;Ⅰ组(对照组)饲喂基础日粮,Ⅱ组(试验组)在基础日粮中添加1%复方白头翁散超微粉方剂,试验期为10周;Ⅰ组、Ⅱ组分别在2,4,6,8,10周采血,检测部分生化免疫指标总蛋白(TP)、白蛋白(ALB)、免疫球蛋白(Ig G)以及抗氧化功能指标超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、总抗氧化能力(T-AOC)及尿素氮(BUN)。结果表明:在每个试验阶段,Ⅱ组血清中的TP、Ig G GSH-Px、T-AOC水平均明显高于Ⅰ组,Ⅱ组血清中BUN含量低于Ⅰ组。说明在饲料中添加1%复方白头翁散超微粉方剂能提高貉部分生化免疫指标及抗氧化功能;降低貉体内BUN含量,提高机体BUN的代谢,改善肾脏功能。展开更多
基金supported by the National Natural Science Foundation of China(No.50874013)the support from the Key Lab. of the Ministry of Education of China for Ecologic & Recycle Metallurgy,University of Science and Technology Beijing
文摘The oxidation behavior of different SiAlON phases（β-SiAlON,X-phase SiAlON and 12H powders） synthesized from coal gangue in air atmosphere was investigated using isothermal thermogravimetry（TG） and field-emission scanning electron microscopy（FE-SEM）.The effect of ferric oxide impurities in coal gangue was studied.The results show that ferric oxide contributes to the growth of SiAlON crystalline during the synthesis process.In the oxidation experiment,the existence of ferric oxide decreases the oxidation resistance of SiAlON.The reason is that the impurity causes the formation of a liquid phase at a higher temperature.At 1423-1623 K,the oxidation of SiAlON powders is diffusion controlled and it can be described by Chou＇s model.A fair agreement is found between theoretical calculations and the experimental data.
文摘New composition perovskite-type compounds with formula Sr0.6Bi0.4FeO2.7,Sr1-xBixFeO3-y(x=0.1 to 0. 9 in interveral of 0.1),and Ba1.5Pt0.5Mn2O6 have been synthsized and structurally characterized.The crystal structure of Sr0.6Bi0.4FeO2.7has been determined by X-ray single crystal diffraction,and the data of neutron powder diffraction collected at both room temperature and elevated temperature(380℃).The compound Sr0.6Bi0.4FeO2.7 crystallizes in the cubic space group of Pm3m with Z=1,a=3.9330(6) at room temperature,a=3.9498(6)A at 380℃.The magnetic structure from the neutron powder diffraction data collected at room temperature is consistent with a simple G-type antiferromagnetism and has a magnetic moment of 4.98 μB per Fe atom.The structures of Sr1-xBixFeO3-y with x other than 0.4 were also refined from the X-ray powder diffraction data.The data were consistent with a tetragonal cell when x=0.1,a rhombohedral cell when x= 0.9,and a cubic cell for x=0.2～0.8.From single crystal X-ray diffraction data,Ba1.5Pt0.5Mn2O6 crystallizes in hexagonal space group of P63mc with a= 5.7722 (6),c=4.4504(9),V=128.42(2),Z=1.The Sr(1-x)BixFeO(3-y)are found to be a good electronic and ionic conductor.
文摘为了研究复方白头翁散超微粉对貉部分生化免疫指标及抗氧化功能的影响,试验选择80只45日龄体重相近的断奶仔貉,随机分成2组,每组40只;Ⅰ组(对照组)饲喂基础日粮,Ⅱ组(试验组)在基础日粮中添加1%复方白头翁散超微粉方剂,试验期为10周;Ⅰ组、Ⅱ组分别在2,4,6,8,10周采血,检测部分生化免疫指标总蛋白(TP)、白蛋白(ALB)、免疫球蛋白(Ig G)以及抗氧化功能指标超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、总抗氧化能力(T-AOC)及尿素氮(BUN)。结果表明:在每个试验阶段,Ⅱ组血清中的TP、Ig G GSH-Px、T-AOC水平均明显高于Ⅰ组,Ⅱ组血清中BUN含量低于Ⅰ组。说明在饲料中添加1%复方白头翁散超微粉方剂能提高貉部分生化免疫指标及抗氧化功能;降低貉体内BUN含量,提高机体BUN的代谢,改善肾脏功能。
