Synthesis, Thermal Expansion Properties and Raman Spectroscopic Study of Ca_1-xSr_xZr₄P₆O₂₄ Ceramics

Abstract:

A simplified method with much lower time and energy costs is presented for the rapid synthesis of low thermal expansion materials of CaZr₄P₆O₂₄, SrZr₄P₆O₂₄ and their solid solution Ca_0.5Sr_0.5Zr₄P₆O₂₄. The coefficients of thermal expansion of CaZr₄P₆O₂₄, SrZr₄P₆O₂₄ and Ca_0.5Sr_0.5Zr₄P₆O₂₄ are measured to be -1.45×10^-6, 2.1×10^-6 and 0.26×10^-6, respectively. Raman spectroscopic study confirms the formation of the solid solution of Ca_0.5Sr_0.5Zr₄P₆O₂₄ though its symmetric and asymmetric stretching modes are obviously broadened with respect to those of CaZr₄P₆O₂₄ and SrZr₄P₆O₂₄ due to the lattice deformation by incorporation of Ca²⁺ and Sr²⁺ with different cation size. The shifts of the asymmetric stretching Raman modes and the librational/translational modes with temperature in Ca_0.5Sr_0.5Zr₄P₆O₂₄ are between those in CaZr₄P₆O₂₄ and SrZr₄P₆O₂₄, suggesting a cancelling effect of Ca²⁺ and Sr²⁺ cations in the thermal expansion of Ca_0.5Sr_0.5Zr₄P₆O₂₄.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1023-1027
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1023
• Online since: December 2011
• Authors: Zhi Hong Wang, Dong Yan Xie, Bao He Yuan, Xian Sheng Liu, Wen Bo Song, Bin Yuan, Er Jun Liang
• Keywords: Calcium Strontium Zirconium Phosphate, Low-Thermal Expansion Ceramic, Raman Spectroscopy

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