CAJ | 학술논문

通过X射线衍射、中子衍射及磁测量等研究了Nb、Al双取代对Nd2 Fe17－ x－ y Nbx Aly 化合物结构和磁性能的协同影响。X射线衍射结果表明，Nd2 Fe17－ x－ y Nbx Aly 的晶胞体积几乎随Al含量的增加而线性增加，当Al含量相同时，Nb的加入引起晶胞体积的增大。中子衍射分析结果表明，Nb优先占据6c晶位，Al优先占据18h晶位。磁测量结果表明，0.0≤ y≤3.0时，单取代的Nd2 Fe17－ y Aly 化合物的居里温度随Al含量的增加先升高后降低，但双取代的Nd2 Fe16.5－ y Nb0.5 Aly 化合物的居里温度却随Al含量的增加而线性升高，这表明Nb、Al双取代对磁性能的改善会产生协同效应。
통과X사선연사、중자연사급자측량등연구료Nb、Al쌍취대대Nd2 Fe17－ x－ y Nbx Aly 화합물결구화자성능적협동영향。X사선연사결과표명，Nd2 Fe17－ x－ y Nbx Aly 적정포체적궤호수Al함량적증가이선성증가，당Al함량상동시，Nb적가입인기정포체적적증대。중자연사분석결과표명，Nb우선점거6c정위，Al우선점거18h정위。자측량결과표명，0.0≤ y≤3.0시，단취대적Nd2 Fe17－ y Aly 화합물적거리온도수Al함량적증가선승고후강저，단쌍취대적Nd2 Fe16.5－ y Nb0.5 Aly 화합물적거리온도각수Al함량적증가이선성승고，저표명Nb、Al쌍취대대자성능적개선회산생협동효응。
The combined effects of double substitution of Nb and Al for Fe on the crys‐tallographic structure and magnetic properties of Nd2 Fe17 - x- y Nbx Aly compounds were investigated by means of X‐ray diffraction ,neutron diffraction and magnetic measure‐ment .T he Rietveld refinements of the diffraction data indicate that all the samples crys‐tallize in the rhombohedral Th2Zn17‐type structure with small impurities .The unit cell volumes of Nd2 Fe17 - x- y Nbx Aly are all found to increase linearly with the increase of Al content and the unit cell volume of Nd2 Fe16.5 - y Nb0.5 Aly is larger than that of Nd2 Fe17 - y Aly . The neutron diffraction indicates that Nb prefers to occupy 6c sites while Al prefers to occupy 18h sites . The Curie temperature of Nd2 Fe17 - y Aly first increases and then decreases with the increase of Al content ,while the Curie temperature of doubly substi‐tuted Nd2 Fe16.5 - y Nb0.5 Aly increase linearly with 0.0 ≤ y ≤ 3.0 , and it indicates the synergetic effect on the magnetic property .