Suppressing the phase transition of ZrP_(2)O_(7), by defect and entropy regulation for high-temperature wave-transparent material application  

作　　者：Peng Liu Zhilin Tian Zhilin Chen Shuping Wen Liya Zheng Bin Li 

机构地区：[1]School of Materials,Shenzhen Campus of Sun Yat-sen University,Shenzhen 518107,China

出　　处：《Journal of Advanced Ceramics》2024年第8期1164-1177,共14页先进陶瓷（英文）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.52202078 and 52202126);the Leading Talent Project of the National Special Support Program(No.2022WRLJ003);the Guangdong Basic and Applied Basic Research Foundation for Distinguished Young Scholars(No.2021B1515020083);the Guangdong Basic and Applied Basic Research Foundation(Nos.2021A1515110293 and 2022A1515012201).

摘　　要：ZrP_(2)O_(7) is a promising wave-transparent material due to its low dielectric constant and low dielectric loss,but its inherent phase transition characteristic at approximately 300℃ limits its high-temperature application.Therefore,suppressing the phase transition is necessary for ZrP_(2)O_(7),to serve in extremely harsh environments.In this work,introducing Ti and Hf into ZrP_(2)O_(7) causes significant lattice distortion and an increase in entropy,both of which synergistically limit the crystal structure transformation.In addition,enhanced phonon scattering by mismatch of atomic mass and local distortion leads to a reduction in the thermal conductivity.Lattice distortions also cause changes in both bond length and tilting angle,so that(Ti_(1/3)Zr_(1/3)Hf_(1/3))P_(2)O_(7) does not undergo sudden expansion as does ZrP_(2)O_(7).(Ti_(1/3)Zr_(1/3)Hf_(1/3))ZrP_(2)O_(7) maintains excellent dielectric properties,which highlights it as a promising high-temperature wave-transparent material.

关 键 词：wave-transparent material medium-entropy ceramics phase transition dielectric constant thermal expansion thermal conductivity 

分 类 号：TQ174.1[化学工程—陶瓷工业] TB33[化学工程—硅酸盐工业]