Abstract
The crystal structure and microwave dielectric properties of the (1 −x) La(Zn1/2Ti1/2)O3·xSrTiO3 and (1 −x)La(Zn1/2Ti1/2)O3·xCaTiO3 system were investigated. X‐ray powder diffraction showed that cation ordering disappeared atx> 0.3 for both systems. However, infrared spectra demonstrated that short‐range cation ordering could exist atx= 0.4. Permittivity and the temperature coefficient of the resonant frequency (τf) of both systems exhibited nonmonotonic variations with composition. Both systems exhibited a τf of zero at the same composition of x= 0.5 although the τf of SrTiO3 was about two times larger than that of CaTiO3. The behavior of the permittivity and τf were described by the tilting of oxygen octahedra and cation ordering. The relation between τf and cation ordering of La(Zn1/2Ti1/2)O3 was discussed in conjunction with the experimental results on metal halides. It is suggested that cation ordering induced a negative τf and suppressed the increase of permittivity for compositions between x= 0 to x= 0.5 for (1 −x)La(Zn1/2Ti1/2)O3·xSrTiO3 and (1 −x)La(Zn1/2Ti1/2)O3·xCaTiO3 systems.
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