摘要
通过x射线衍射及磁测量手段研究了Tb2 Fe1 5 5Cr1 5化合物的热膨胀性质及本征磁致伸缩性质 .研究结果表明Tb2 Fe1 5 5Cr1 5化合物在 2 93— 6 72K的温度范围内具有六角相的Th2 Ni1 7型结构 .在 4 32— 5 2 2K的温度范围内具有负热膨胀性质 ,其平均热膨胀系数 α =- 1 5 7× 10 - 5 K .对本征磁致伸缩的研究结果表明Tb2 Fe1 5 5Cr1 5化合物中存在着较强的各向异性的本征磁致伸缩 ,2 93K时其本征体磁致伸缩约为 8. 4× 10 - 3,晶格畸变主要发生在c轴方向上 .磁测量研究结果表明Tb2 Fe1 5 5Cr1 5化合物的居里温度约为 4 94K ,比其母合金Tb2 Fe1 7高约 80K .
The negative thermal expansion and spontaneous magnetostrictive deformation of Tb2Fe15.5Cr1.5 compound have been investigated by means of x-ray diffraction and magnetization measurements. The compound Tb2Fe15.5Cr1.5 has a hexagonal Th2Ni17-type structure from 293 to 672K. A negative thermal expansion was found from 432 to 522K. The coefficient of the average thermal expansion is (α) over bar = -1.57 x 10(-5)/K. There exists a strong and anisotropic spontaneous magnetostriction in the magnetic state of Tb2Fe15.5Cr1.5. The spontaneous volumetric magnetostrictive deformation is about 8.4 x 10(-3) at 293K and the deformation occurs mainly in the direction of c-axis. The result of magnetization measurement shows that the Curie temperature of Tb2Fe15.5Cr1.5 is 494K, which is by about 80K higher than the mother compound Tb2Fe17.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第5期2334-2337,共4页
Acta Physica Sinica
基金
国家自然科学基金 (批准号 :5 0 2 710 2 2 )
教育部优秀青年教师资助计划项目 (批准号 :1999)
天津市自然科学基金 (批准号 :0 43 60 2 0 11)资助的课题 .~~
