中国物理B ›› 2017, Vol. 26 ›› Issue (1): 16501-016501.doi: 10.1088/1674-1056/26/1/016501
• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇 下一篇
Tao Li(李涛), Xian-Sheng Liu(刘献省), Yong-Guang Cheng(程永光), Xiang-Hong Ge(葛向红), Meng-Di Zhang(张孟迪), Hong Lian(连虹), Ying Zhang(张莹), Er-Jun Liang(梁二军), Yu-Xiao Li(李玉晓)
Tao Li(李涛)1, Xian-Sheng Liu(刘献省)2, Yong-Guang Cheng(程永光)1,3, Xiang-Hong Ge(葛向红)1, Meng-Di Zhang(张孟迪)1, Hong Lian(连虹)1, Ying Zhang(张莹)1, Er-Jun Liang(梁二军)1, Yu-Xiao Li(李玉晓)1
摘要:
HfMgMo3-xWxO12 with x=0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of HfMgMo3-xWxO12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x>2.0. A near-zero thermal expansion (ZTE) is realized for HfMgMo2.5W0.5O12 and negative coefficients of thermal expansion (NCTE) are achieved for other compositions with different values. The ZTE and variation of NCTE are attributed to the difference in electronegativity between W and Mo and incorporation of a different amount of W, which cause variable distortion of the octahedra and softening of the MoO4 tetrahedra, and hence an enhanced NCTE in the a- and c-axis and reduced CTE in the b-axis as revealed by Raman spectroscopy and x-ray diffraction.
中图分类号: (Thermal expansion; thermomechanical effects)