Study on properties of tantalum-doped La2Ti2O7 ferroelectric ceramics

Chunchun Li, Jibran Khaliq, Huanpo Ning, Xiaoyong Wei, Haixue Yan, Michael Reece

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7 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)1550005
JournalJournal of Advanced Dielectrics
Issue number01
Publication statusPublished - 31 Mar 2015


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