The structural characteristics and microwave dielectric properties of Ti4+ doped CaMgSi2O6 ceramics. Issue 22 (15th November 2022)

• Record Type: Journal Article
• Authors: Huang, Fangyi; Su, Hua; Zhang, Qin; Wu, Xiaohui; Jing, Yulan; Li, Yuanxun; Tang, Xiaoli
• Is Part Of: Ceramics international. Volume 48:Issue 22(2022)
• Page Start: 33615
• Page End: 33623
• Publication Date: 2022-11-15
• Subjects: CaMgSi2O6 ceramics -- Ti4+ substitution -- Dielectric properties -- Chemical bond characteristics; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.07.306
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The effect of Ti substitution on microwave dielectric properties and structural characteristics of CaMgSi2 O6 ceramics synthesized via solid-state reaction method was investigated by XRD, XPS, Raman spectroscopy, SEM, EDS, Rietveld refinement, P–V-L theory and bond valence theory. XRD patterns indicated that CaTiO3 was gradually formed with the increase in Ti content. The permittivity was closely related to ionic polarizability, which was confirmed by Raman shifts. Quality factor ( Q × f ) and temperature coefficient of resonant frequency ( τ f ) were considerably affected by lattice stability. Moreover, lattice energy and cation ordering of CaMgSi2 O6 influenced Q × f, while cation bond valence affected the τ f value. Improved microwave dielectric properties were achieved with high lattice energy and appropriate bond valence for well-densified CaMgSi1.95 Ti0.05 O6 ceramics with specific values of Q × f = 80774 GHz (±2578 GHz; @13.47 GHz, tan δ = 1.67 × 10 −4 ), ε r = 7.94 (±0.208), and τ f = −58.56 ppm/°C (±2.65 ppm/°C) with high relative density ( ρ r = 96.9%).