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.
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).
