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Crystal Structure, Raman Spectra and Dielectric Properties of Ca_0.66Ti_0.66La_0.34Al_0.34O₃ Microwave Ceramics with Nd³⁺Additions

Y. Xu, R. Fu, Y. Yang, J. Cai, X. Gu, J. Fang

Journal of Ceramic Science and Technology, Vol. 7, No. 3 (2016), pp. 257-262

DOI: 10.4416/JCST2016-00001

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Abstract

Ca0.66Ti0.66La0.34Al0.34O3 (CTLA) ceramics doped with Nd2O3 were prepared by means of the conventional solid-state reaction method. The Nd2O3 dopant was added in the range of 0.5 – 3.5 wt%. The dielectric properties, crystal structure and Raman spectra of the CTLA ceramics doped with Nd2O3 were investigated with the Hakki and Coleman's dielectric resonant, XRD and Raman spectroscopy method, respectively. It was found that Nd2O3 promotes the densification and enlarges the crystal cell volume of CTLA ceramics. Two chemical reaction defects emerge in CTLA ceramics with the substitution of Nd3+. Nd3+ is substituted for La/Ca atoms at the A-sites of the CTLA ceramics' structure with increasing Nd2O3 doping, and the polarization of the TiO6 octahedra reaches the maximum volume when the amount of Nd2O3 doping is 2.0 wt%. Excellent microwave dielectric properties of Q×f= 37454 GHz (@4 GHz), εr = 45 and τf = 0.13 ppm/°C were obtained for CTLA ceramics with the addition of 2.0 wt% Nd2O3.

Keywords

Ca0.66Ti0.66La0.34Al0.34O3, microwave dielectric properties, structure, additives

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