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Behavior of Mn^(2+) in perovskite manganites with nominal composition La_(0.6-x)Nd_xSr_(0.1)MnO_3

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Rare Metals 2012年第4期31卷 379-386页

作者： Li,Yanfeng Ji,Denghui Liu,Shaopeng Tang,Guide Li,Zhuangzhi Yao,Yuxi hou,denglu Zhu,Minggang Hebei Advanced Thin Films Laboratory Department of PhysicsHebei Normal UniversityShijiazhuang 050016China Division of Functional Materiais Research Central Iron&Steel Research InstituteBeijing 100081China

The fact that there are Mn^(2+) at the A sites in the ABO_3 perovskite phase of manganites with the nominal composition La_(0.6-x)Nd_xSr_(0.1)MnO_3 showed by detailed experimental study and theoretical *** magnetic moments of these Mn^(2+) are antiparallel to those of the Mn ions at the B *** content of the Mn^(2+) increases as the average ionic radius,,of the ions at A sites decreases,resulting in the experimentally observed phenomenon that the content of the Mn_3O_4 phase in the manganites decreases with decreasing .

关键词： perovskite manganite magnetic property crystal structure vacancy

Roles of Te and Mn in the two phases of manganite with nominal composition La_(0.6)Sr_(0.1)Te_xMnO_3

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Rare Metals 2011年第3期30卷 232-240页

作者： LI Yanfeng JI Denghui ZHAO Zhiwei TANG Guide LIU Shaopeng ZHANG Yuge LI Zhuangzhi hou denglu ZHU Minggang Department of Physics Hebei Normal University Hebei Advanced Thin Films Laboratory Shijiazhuang 050016 China Division of Functional Materials Research Central Iron ＆ Steel Research Institute Beijing 100081 China

Powder samples with nominal composition La0.6Sr0.1TexMnO3 （x = 0.00, 0.05, 0.10, 0.15, 0.20） were prepared using the sol-gel method with thermal treatment up to 1473 K. On the basis of powder X-ray diffraction （XRD）, thermogravimetric and magnetic measurements, it was found that almost all of the Te and a few of the Mn ions were lost from the samples when they were calcined at 1473 K. The reason for the Te loss and a quantitative phase analysis for the samples calcined at 1473 K are discussed in detail.

关键词： condensed matter physics crystal defects X-ray diffraction perovskite manganite magnetic properties

Synthesis of iron(Ⅲ)-doped nanostructure TiO_2/SiO_2 and their photocatalytic activity

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Rare Metals 2007年第6期26卷 565-571页

作者： CHEN Rufen ZHANG Lei SONG Xiuqin WEI YU hou denglu College of Chemistry and Material Science Hebei Normal University Shijiazhuang Hebei 050016 China Key Laboralory of Advanced Film of Hebei Province Shijiazhuang Hebei 050016 China

Iron（Ⅲ）-doped nanostructure TiO2-coated SiO2 （TiO2/SiO2） particles were prepared using the layer-by-layer assembly technique and their photocatalytic property was studied. TiO2 colloids were synthesized employing the sol-gel method with TiChas a precursor. The samples were characterized by Fourier transform infrared spectroscopy （FTIR）, SEM, EDS, XPS, and XRD. The experimental results show that TiO2 nanopowders on the surface of SiO2 particles are well distributed, the amount of TiO2 is increased with the adding of coating layers, the pure anatase-TiO2 coating layers are synthesized at 500℃, and the photocatalytic activity of Fe^3＋-doped TiO2/SiO2 is higher than that of undoped TiO2/SiO2.

关键词： TiO2 coating SiO2 particle nanostructure layer-by-layer assembly doping photocatalytic activity

Co Content Dependence of Crystal Structure and Specific Magnetization of Fe_(1-x)Co_x-SiO_2 Granules Prepared by Sol-Gel Method

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Journal of Materials Science & Technology 1999年第4期15卷 390-390页

作者： Guide TANG Wei CHEN Jianguo ZHAO denglu hou Ying LIU Chengfu PAN and Xiangfu NIE(Department of Physics, Hebei Normal University, Shijiazhuang 050016, Hebei, China)To whom correspondence should be addressed E-mail: dlhou@*** Hebei Normal Univ Dept Phys Shijiazhuang 050016 Hebei Peoples R China

The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and ... 详细信息

关键词： SiO x)Cox-SiO2 Granules Prepared by Sol-Gel Method Fe Co Content Dependence of Crystal Structure and Specific Magnetization of Fe

多晶Sr_(0.6)Ca_(0.4)RuO_3磁性的Preisach模型研究

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稀有金属 2007年第6期31卷 762-765页

作者：徐静王海涛侯登录河北工程大学理学院河北邯郸056038 河北师范大学物理学院河北石家庄050016

测量了多晶Sr0.6Ca0.4RuO3的零场冷却(ZFC)的磁化强度随温度的变化关系,以及不同温度下的磁滞回线。考虑热涨落和自由能壁垒随温度的变化,用Preisach模型对测量数据进行了拟合。数值模拟再现了测量结果的变化规律,其中包括各温度下的磁... 详细信息

测量了多晶Sr0.6Ca0.4RuO3的零场冷却(ZFC)的磁化强度随温度的变化关系,以及不同温度下的磁滞回线。考虑热涨落和自由能壁垒随温度的变化,用Preisach模型对测量数据进行了拟合。数值模拟再现了测量结果的变化规律,其中包括各温度下的磁滞回线,不同外磁场下的ZFC磁化强度曲线等。对拟合得到的巴克豪森跳跃谱的有关参数进行了讨论。

关键词： Barkhausen跳跃 Preisach模型 ZFC磁化强度

Preparation and Magnetic Properties of (Fe_7Co_3)_(0.15)(SiO_2)_(0.85)Granular Solids Using the Sol-Gel Method

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Journal of Materials Science & Technology 1999年第4期15卷 389-389页

作者： Wei CHEN denglu hou Ying LIU Guide TANG Minggang ZHU Jianguo ZHAO Xiangfu NIE and Hongyan WU(Department of Physics, Hebei Normal University, Shijiazhuang 050016, Hebei, China)To whom correspondence should be addressed E-mail: dlhou@*** Hebei Normal Univ Dept Phys Shijiazhuang 050016 Hebei Peoples R China

(Fe7Co3)0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron micrography(TEM) and vibrating sample magnetometer(VSM). The av-erage particIe sizes of the samples were also calculated from Scherrer formula. The magnetic properties of (Fe7Co3 )o. 15 (SiO2)0.85 were studied in detail.

关键词： SiO2 Fe7Co3 Preparation and Magnetic Properties of Granular Solids Using the Sol-Gel Method

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V掺杂ZnO薄膜的室温铁磁性

河北师范大学学报（自然科学版） 2010年第3期34卷 296-299页

作者：李莉赵瑞斌侯登录石家庄邮电职业技术学院电信工程系河北石家庄050031 河北医科大学基础教学部河北石家庄050011 河北师范大学物理科学与信息工程学院河北石家庄050016

采用磁控溅射法在Si基底上制备了Zn1-xVxO系列薄膜样品,X射线衍射表明所有样品都具有纤锌矿结构,没有发现其他的衍射峰存在.研究发现,c轴晶格常数随着掺杂浓度的增加而增大.原子力显微镜测量表明样品中的颗粒分布均匀,没有发现团聚物.... 详细信息

采用磁控溅射法在Si基底上制备了Zn1-xVxO系列薄膜样品,X射线衍射表明所有样品都具有纤锌矿结构,没有发现其他的衍射峰存在.研究发现,c轴晶格常数随着掺杂浓度的增加而增大.原子力显微镜测量表明样品中的颗粒分布均匀,没有发现团聚物.磁性测量表明,直接沉积的样品具有顺磁性,而经真空退火的所有样品都具有明显的室温铁磁性,且随着掺杂浓度的增加,样品的饱和磁化强度增加.

关键词：射频磁控溅射室温铁磁性氧空位

LaNi_(3.8-x)Al_x(0≤x≤0.5)多相储氢合金的结构及电化学性能

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中国稀土学报 2011年第3期29卷 360-364页

作者：闫小龙刘增彦宋秀芹柴玉俊侯登录河北师范大学化学与材料科学学院河北石家庄050016 河北师范大学物理与信息工程学院河北石家庄050016

采用真空电弧熔炼法制备了LaN i3.8-xA lx(0≤x≤0.5)储氢合金,并在氩气气氛中进行退火处理。通过X射线衍射(XRD),S ievert′s方法和电化学测试分别分析了合金的物相结构、储氢和电化学性能。研究结果表明:LaN i3.8-xA lx(0≤x≤0.5)合... 详细信息

采用真空电弧熔炼法制备了LaN i3.8-xA lx(0≤x≤0.5)储氢合金,并在氩气气氛中进行退火处理。通过X射线衍射(XRD),S ievert′s方法和电化学测试分别分析了合金的物相结构、储氢和电化学性能。研究结果表明:LaN i3.8-xA lx(0≤x≤0.5)合金主要由LaN i5,Ce2N i7,Pr5Co19和Ce5Co19型相组成。随着A l的变化,各相相丰度发生变化,而相丰度的变化影响了合金的滞后和吸/放氢平台压力。随着x的增加,LaN i3.8-xA lx(0≤x≤0.5)合金的放电容量先增大至270 mAh.g-1(x=0.3),然后缓慢降低;在x=0.3时合金显示出较好的充/放电循环稳定性。极化电阻和电化学交流阻抗则随着x的增加缓慢降低,交换电流密度增大,导致高倍率放电有所增大。

关键词：多相合金储氢合金电化学性能稀土

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Mn掺杂的TiO_2粉体的结构和磁性

河北师范大学学报（自然科学版） 2011年第4期35卷 365-368页

作者：李莉赵月恩李学海侯登录石家庄邮电职业技术学院电信工程系河北石家庄050031 河北师范大学物理科学与信息工程学院河北石家庄050016

采用溶胶-凝胶法制备了过渡金属Mn掺杂的TiO2基稀磁半导体粉末.XRD结果表明,所有样品均为锐钛矿结构,不存在任何杂相,且随掺杂浓度的增大,晶格常数单调减小,表明Mn替代Ti进入晶格形成稀磁半导体结构.采用VSM检测样品磁性,x=0.06,0.08的... 详细信息

采用溶胶-凝胶法制备了过渡金属Mn掺杂的TiO2基稀磁半导体粉末.XRD结果表明,所有样品均为锐钛矿结构,不存在任何杂相,且随掺杂浓度的增大,晶格常数单调减小,表明Mn替代Ti进入晶格形成稀磁半导体结构.采用VSM检测样品磁性,x=0.06,0.08的样品显示为室温顺磁性,x=0.12的样品在刚加外磁场时,饱和磁化强度随磁场强度的变化类似铁磁材料的情形,但与铁磁材料不同的是随着H的增加,M并没有趋于饱和,而是像顺磁材料那样M随H的增加而线性增加.

关键词： TiO2 稀磁半导体顺磁性