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Analysis of the new ternary phase with C_(6)Cr_(23) structure in mg-co-B system by Rietveld method and physical properties of its Ni-substituting effect

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Journal of Magnesium and Alloys 2022年第7期10卷 1899-1908页

作者： Qiang Feng Changzhong Liao Cheng Dong Kaimin Shih Minhua Su college of Physics and Engineering Chengdu Normal UniversityChengduSichuan 611130China Department of Civil Engineering The University of Hong KongHong KongChina National Laboratory for Superconductivity Institute of Physics and Beijing National Laboratory for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100190China Guangdong Provincial Key Laboratory of Radionuclides Pollution control and Resources School of Environmental Science and EngineeringGuangzhou UniversityGuangzhou 510006China

A new ternary mg_(1.4)co_(21.6)B_(6) compound in the mg-co-B system was synthesized via a conventional solid-state reaction method and the effect of Ni-substitution on its crystal structure,thermal stability,solid solubility and physical properties were systematically *** crystal structure of the mg_(1.4)co_(21.6)B_(6) compound was fully determined by the X-ray diffraction technique with Rietveld refinement *** is found that mg_(1.4)co_(21.6)B_(6) crystallizes in the form of C_(6)Cr_(23) structure type(space group:Fm-3m(No.225),a=10.5617(2)A,Z=4).The results showed that the 4a sites have been occupied completely by co atoms in present compound which with M_(2-x)Ni_(21+x)B_(6) form belonging to the W_(2)Cr_(21)C_(6)-*** mg_(1.4)co_(21.6)B_(6) is repeatedly sintered at elevated temperatures,it becomes unstable and decomposes into co3B and *** lattice parameters of the mg_(1.4)co_(21.6)B_(6) solid solution alters dramtically with increasing Ni substitution,with no regular trend being *** electrical and magnetic performances of the 3.6mg:3co:17Ni:6B and 3.6mg:3co:18Ni:6B(nominal compositions)samples suggest that both samples are typical ferromagnetic *** temperature in the maximum drop of theρ(T)curve decreases as a function of the Ni *** on the correlation between the critical temperature and Ni content,a linear fitting equation is obtained and the critical temperature of mg_(1.4)co_(21.6)B_(6) calculated utilizing the linear fitting *** findings in this work may provide certain reference values for material science on electrical magnetic properties and other references for researching the material further.

关键词： mg-co-bsystem Crystal structure Stability Ni-substituting effect Rietveld refinement

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