Influence of Ti4+ substitution for Zr4+ on the structure and microwave dielectric properties of Pr2Zr3(MoO4)9 ceramic

• Published in: Journal of alloys and compounds Vol. 911; p. 164986
• Main Authors: Liu, Lintao, Ji, Xueli, Wu, Haitao, Du, Jialun, Zhou, Yuanyuan, Yue, Zhenxing
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 05.08.2022; Elsevier BV
• Subjects: Ceramics; Chemical bonds; Composition; Crystal structure; Dielectric properties; Lattice vibration; Low dielectric loss; Low temperature; LTCC; Microwave dielectric properties; Network analysers; Pr2(Zr1−xTix)3(MoO4)9; Raman spectra; Scanning electron microscopy; Solid phases; X-ray diffraction; Low dielectric loss; LTCC; Pr2(Zr1−xTix)3(MoO4)9; Microwave dielectric properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.164986

Ceramics with composition of Pr2(Zr1−xTix)3(MoO4)9 (0.02 ≤ x ≤ 0.10) were fabricated by classic solid-phase method. X-ray diffractometer (XRD), Scanning electron microscope (SEM), Raman spectra, FT-IR spectrometer and Agilent vector network analyzer were used to investigate the composition of phase, microscopy, lattice vibration, internal dielectric responding and dielectric properties, respectively. XRD indicates the Pr2(Zr1−xTix)3(MoO4)9 (0.02 ≤ x ≤ 0.10) ceramics own trigonal-type crystal structure and R-3c space group and the SEM patterns confirms the optimal sintering temperature is 800 °C. Simultaneously, the ceramic reached the optimal microwave dielectric properties with εr = 10.8, Q×f = 81,539 GHz and τf = −14.2 ppm/°C at 800 °C for x = 0.10. By means of the theory of complex crystals chemical bonds (P-V-L theory), the connections with crystal structure and microwave dielectric properties were deeply discussed. Due to the relatively low fired temperature and superior dielectric properties, there is an expect for Pr2(Zr0.90Ti0.10)3(MoO4)9 ceramic to apply in low temperature cofired ceramic (LTCC). [Display omitted] •Rietveld refinement was used to obtain the cell parameters.•The effects of substitution of Zr4+ by Ti4+ on Pr2Zr3(MoO4)9 ceramics was explored based on the P-V-L theory.•Q·f value has been improved by more than 130% in Pr2(Zr0.90Ti0.10)3(MoO4)9 ceramics.•Optimum microwave dielectric properties (εr = 10.8, Q×f = 81,539 GHz and τf = −14.2 ppm/°C) were obtained at 800 °C.