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Crystal structural refinement for NdAlSi

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Rare Metals 2006年第4期25卷 355-358页

作者： HE Wei ZHANG Jiliang ZENG Lingmin zhuang yinghong Institute of Materials Science Guangxi University Nanning 530004 China

The compound NdAlSi was studied using X-ray powder diffraction technique and refined by the Rietveld method. The compound NdAlSi has tetragonal α-ThSiE-type structure, space group I41/amd （No. 141）, Z = 4, and the lattice parameters a = 0.41991（1） nm, c = 1.44916（3） nm. The Smith and Snyder figure of merit FN is F30= 103.1（36）. The R-factors of Rietveld refinement are Rp= 0.113 and Rwp= 0.148, respectively. The X-ray powder diffraction data is presented in this article.

关键词： NdAlSi crystal structure X-ray powder diffraction data Rietveld method

Magnetocaloric effect of (Gd_(1-x)Ce_x)Co_2 compounds in low magnetic fields

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Rare Metals 2009年第5期28卷 487-490页

作者： CHEN Xiang zhuang yinghong FANG Fei YAN Jialin Department of Physics and Electronic Informational Engineering Neijiang Teachers College Neijiang 641002 China Key laboratory of Nonferrous Metal Materials and New Processing Technology Ministry of Education Guangxi University Nanning 530004 China

The phases in the compounds （Gd1-xCex）Co2 with x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5 were investigated by X-ray diffraction, and the magnetocaloric effect for x = 0-0.4 was studied by magnetization measurements. The samples are almost single phase with a cubic MgCu2-type structure for x = 0-0.5. The magnetization decreases with an increase in Ce content. There is almost no magnetic transition for x = 0.5 at 100-350 K. The Curie temperature （To） of the （Gd1-xCex）Co2compounds with x from 0.1 to 0.4 are 350, 344, 340, and 338 K respectively. The maximum magnetic entropy change is 2.34 J·kg^-1·K^-1 when x = 0.3. The results of Arrott plots show that the magnetic phase transition is second-order magnetic phase transition in these compounds.

关键词： magnetic refrigeration materials magnetocaloric effect X-ray diffraction magnetic entropy change

Influence of carbon on the giant magnetocaloric effect of LaFe_11.7Si_1.3

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Rare Metals 2006年第5期25卷 556-561页

作者： LI Junqin LIU Fusheng AO Weiqin zhuang yinghong ZHOU Kaiwen Department of Materials Science and Engineering Shenzhen University and Shenzhen Key Laboratory of Special Functional Materials Shenzhen518060 China Key laboratory of Nonferrous Metal Materials and New Processing Technology Ministry of Education Guangxi University Nanning 530004China

The influences of carbon on phase formation, Curie temperature, and magnetic entropy change of the NaZn13-type LaFe11.7Si1.3 were investigated. Seven carbon-containing alloys, LaFe11.7Si1.3Cx with x = 0, 0.03, 0.06, 0.10, 0.20, 0.30, and 0.50, respectively, were prepared for this investigation. Experimental results show that addition of a small amount of carbon in LaFe11.7Sil.3 is favorable for the formation of the NaZn13-type structure of LaFe11.7Si1.3Cx. The lattice constant increases with C addition and x increases in the alloy because of the introduction of C as interstitial atoms. The Curie temperature of LaFe11.7Si1.3Cx increases from 194 K to 225 K as x increases from 0 to 0.5. Large magnetic entropy changes were observed in these carbon-containing alloys LaFe11.7Si1.3Cx because of their first-order structural/magnetic transition. The maximum magnetic entropy change of 27.5 ***^-1K^-1 at 202 K for the 0-1.56 T magnetic field change was observed in the alloy with x = 0.06. The large magnetic-entropy changes corresponding to low magnetic field change, and the low cost of the material of LaFe11..7Si1.3Cx makes it a promising candidate to be used as magnetic refrigerants in the corresponding temperature range.

关键词： LaFe11.7Si1.3 carbon addition magnetocaloric effect

X-RAY RIETVELD STRUCTURE REFINEMENT OF ErNiSb

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中国有色金属学会会刊:英文版 1998年第1期8卷 19-20页

作者： Zeng Lingmin Yan Jialin Ou Xiangli He Wei zhuang yinghong Institute of Materials Science Guangxi UniversityNanning 530004P.R.China Center for Fundamental Physics University of Science and Technology of ChinaHefei 230026P.R.China

The crystal structure of compound ErNiSb has been refined by the Rietveld wholepatternfitting method from X-ray powder diffraction *** compound ErNiSb is cubic, space group F43m and the structure parameters and reliability factors were refined to be a=6.268 3(1), V=246.29^(3), Z=4, D_(x)=9.377 g/cm^3, R_(B)=3.57%, R_(F)=3.64%, R_(p)=6.63%, R_(WP)=8.80%.

关键词： X-ray powder diffraction rietveld analysis structure refinement

Phase Relationship in the Al-rich(Al+0.15at %V)-Mg-Zn System

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Rare Metals 1989年第3期9卷 33-37页

作者： Tang, Junqi Li, Dexuan Lin, Weibo zhuang, yinghong Guilin Coll of Geology China

Isothermal sections at room temperature and 450°C for Al-rich (Al+0.15at%V)-Mg-Zn system have been determined by X-ray diffraction, microscopic observation and DTA methods. Comparing with Al-Mg-Zn system the α-phase region in isothermal sections at room temperature and 450°C for the system with 0.15at%V is slightly narrowed and expanded respectively. The solubility limits of Zn and Mg in α-Al have been found to be 3.3at% (7.6wt%) and 5.5at%(5.0wt%) respectively at room temperature, and 6.0at% (13.4wt%) and 11.0at% (10.0wt%) at 450°C. The τ phase in this system is a ternary intermetallic compound, which undergoes an allotropic transformation at about 427°C.

关键词： Aluminum Metallography Transformations Intermetallics Phase Diagrams Magnesium and Alloys Solubility Vanadium And Alloys Solubility Zinc and Alloys Solubility

Influence of Sn substitution for Co in RCo_2 (R= Gd,Tb,Dy) alloys on the structure and magnetocaloric effect

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Rare Metals 2007年第2期26卷 97-102页

作者： zhuang yinghong DENG Jianqiu LI Junqin ZHAN Yongzhong ZHU Qiming ZHOU Kaiwen The Key Laboratory of New Processing Technology for Nonferrous Metal and Materials of Chinese Ministry of Education Guangxi University Nanning 530004 China Shenzhen Key Laboratory of Special Functional Materials ＆ Department of Materials Science and Engineering Shenzhen University Shenzhen 518060 China

The phases and the magnetocaloric effect in the alloys R（Co1-xSnx）2 with X = 0, 0.025, 0.050, 0.075, and 0.100 were investigated by X-ray diffraction analysis and magnetization measurement. The substitution of Sn in RCo2 is limited. The cubic MgCu2-type structure for the alloys of RCo2 was confirmed by X-ray powder diffraction and the remaining alloys mainly consisted of the RCo2 phase, along with some RCo3 and R5Sn3 impurity phases. The impurity phases increase with the increase of Sn content. The Tc of the alloys is not very sensitive to the Sn substitution for Dy（Co1-xSnx）2 and Tb（Co1-xSnx）2, whereas in Gd（Co1-xSnx）2, the Curie temperatures significantly increase. The maximum magnetic entropy changes in the alloys Dy（Co1-xSnx）2 （x = 0, 0.025, 0.050, 0.075） are 5.78, 5.43, 3.88, and 2.98 J·kg^-1·K^-1, respectively, and those in the Tb（Co1-xSnx）2 （x = 0, 0.025） are 3.44, and 2.29 J·kg^-1·K^-1 respectively in the applied field change of 0-2.0 T.

关键词： magnetic refrigeration materials magnetocaloric effect magnetization rare earth compounds

X-RAY POWDER DIFFRACTION STUDY FOR RE COMPOUND GdNiSn

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Transactions of Nonferrous Metals Society of China 1996年第1期6卷 51-53页

作者： Zeng Lingmin zhuang yinghong Li Junqin Zhang Liping Hao Jianmin Institute of Materials Science Guangjci University Nanning 530004 Tianjin Electronic Materials Research Institute Tianjin 300192

The compound GdNiSn has been studied by X-ray powder diffraction *** crystal structure and the X-ray diffraction data for this compound at room temperature are *** compound GdNiSn is orthorhombic with lattice parameters a=7.2044(1)A,b=7.6895(6)A,c=4.4772(4)A,space group Pna2_(1) and 4 formula units of GdNiSn in unit *** Smith and Snyder figure of index F_(30) for this compound is 35(0.015,59).

关键词： RE compound GdNiSn X-ray diffraction data crystal structure

Magnetocaloric effect of (Gd_(1-x)Nd_x)Co_2 alloys in low magnetic field

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Rare Metals 2008年第4期27卷 350-353页

作者： CHEN Xiang zhuang yinghong YAN Jialin ZHOU Kaiwen LI Kefeng Key laboratory of the Ministry of Education of China for Nonferrous Metal Materials and New Processing Technology Guangxi University Nanning 530004 China Department of Physics and Electronic Informational Engineering Neijiang Teachers College Neijiang 641002 China

The phases and magnetocaloric effect in the alloys （Gd1-xNdx）Co2 with x = 0, 0.1, 0.2, 0.3, and 0.4 were investigated by X-ray diffraction analysis and magnetization measurement. The samples are single phase with a cubic MgCu2-type structure. The To decreases obviously with increasing Nd content from 404 K of the alloy with x = 0 to 272 K of the alloy with x = 0.4; forx = 0.3, the To is 296 K, which is near room temperature. In the samples （Gd1-xNdx）Co2 with x = 0.0, 0.1, 0.2, 0.3, and 0.4, the maximum magnetic entropy change is 1.471, 1.228, 1.280, 1.381 and 1.610 J·kg^-1·K^-1, respectively, in the applied field range of 0-2.0 T. The results of Arrott plots confirmed that the transition type were second order magnetic transition forx = 0, 0.3, and 0.4.

关键词： magnetic refrigeration materials magnetocaloric effect magnetic entropy change phase transition

CRYSTAL STRUCTURE AND X-RAY POWDER DIFFRACTION DATA FOR RE COMPOUND HoNiSb

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中国有色金属学会会刊：英文版 1995年第3期5卷 71-73页

作者： Zeng, Lingmin Li, Jungqin Zhang, Liping zhuang, yinghong Hao, Jianmin (Institute of Materials Science, Guangxi University, Nanning 530004)(Tianjin Electronic Materzals Research Institute) Guangxi Univ Nanning China

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关键词： RE compound HoNiSb X-ray diffraction data crystal structure