Study on properties of tantalum-doped La2Ti2O7 ferroelectric ceramics

Li, Chunchun, Khaliq, Jibran, Ning, Huanpo, Wei, Xiaoyong, Yan, Haixue and Reece, Michael (2015) Study on properties of tantalum-doped La2Ti2O7 ferroelectric ceramics. Journal of Advanced Dielectrics, 05 (01). p. 1550005. ISSN 2010-135X

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A series of ceramics with a general formula, La2Ti2-xTaxO7, in which x = 0.05, 0.1, 0.2, and 0.3, were prepared by Spark Plasma Sintering (SPS). Effects of tantalum substitution for titanium on the structure, dielectric, and piezoelectric properties were studied. Results revealed that the structure changed gradually from 4-layer to 3-layer due to the higher valence of Ta. The solid solution limit of tantalum in La2Ti2O7 lattice was in the proximity of x = 0.2. The ferroelectric Curie temperature (Tc) decreased with increasing tantalum doping content. dc resistivity reached a maximum value at x = 0.2 with a value of ∼ 1.0 × 108Ω ⋅ cm at 600°C. The influence of texture on the piezoelectric properties of La2Ti2-xTaxO7 ceramics was also investigated. A maximum d33 value ∼2.1 pC/N was obtained at x = 0.2.

Item Type: Article
Uncontrolled Keywords: Piezoelectric ceramics; Curie temperature; piezoelectric coefficient
Subjects: F100 Chemistry
F200 Materials Science
F300 Physics
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Dr Jibran Khaliq
Date Deposited: 02 Oct 2017 10:14
Last Modified: 01 Aug 2021 03:32

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