[Peng Jie] Chinese Acad Sci, Inst High Energy Phys, Expt Phys Ctr, Beijing 100049, Peoples R China
; [Peng Jie
; Hu Zhong-bo] Chinese Acad Sci, Grad Univ, Coll Chem & Chem Engn, Beijing 100049, Peoples R China
; [Liu Xin-zhi
; Han Song-bai
; Liu Yun-tao
; Chen Dong-feng] China Inst Atom Energy, Beijing 102413, Peoples R China
; [Guo Fu-li
; Zhao Xin-hua] Beijing Normal Univ, Coll Chem, Beijing 100875, Peoples R China
Article; Proceedings Paper
A series of solid solutions Er2W3-xMoxO12 (0.5 <= x <= 2.5) were successfully synthesized by the solid state method. Their crystal structures and negative thermal expansion properties were studied by high temperature X-ray powder diffraction and the Rietveld method. All samples with rare earth tungstates and molybdates crystallize in the same orthorhombic structure with space group Pnca, and show the negative thermal expansion phenomena related to transverse vibration of bridging oxygen atoms in the structure. Thermal expansion coefficients (TECs) of Er2W3-xMoxO12 were determined as -16.2 x 10(-6) K-1 for x=0.5 and - 16.5 x 10(-6) K-1 for x=2.5 while -20.2 x 10(-6) K-1 and -18.4 x 10(-6) K-1 for unsubstituted Er2W3O12 and Er2Mo3O12 in the identical temperature range of 200-800 degrees C. High temperature XRD data and bond length analysis suggest that the difference between W-O and Mo-O is responsible for the change of TECs after the element substitution in the series of solid solutions.
Peng J,Peng, J,Liu, XZ,et al. Crystal structure and negative thermal expansion properties of solid solution Er2W3-xMoxO12[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2009,19(6):1623-1627.
彭杰.,Peng, J.,Liu, XZ.,Guo, FL.,Han, SB.,...&Hu, ZB.(2009).Crystal structure and negative thermal expansion properties of solid solution Er2W3-xMoxO12.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,19(6),1623-1627.
彭杰,et al."Crystal structure and negative thermal expansion properties of solid solution Er2W3-xMoxO12".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 19.6(2009):1623-1627.