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- Title
Enhanced electrical properties of La1.9Nd0.1Ti2O7 ceramics.
- Authors
Li, Yueyi; Addiego, Christopher; Jiang, Laiming; Jiao, Zhifeng; Liang, Dayun; Xu, Mingjie; Chen, Qiang; Pan, Xiaoqing; Zhu, Jianguo
- Abstract
La2−xNdxTi2O7 (LNTO) ceramics with enhanced electrical properties have been prepared by traditional solid-state reaction method. The LNTO ceramics maintain a pure monoclinic phase at x ≤ 0.1. At x > 0.1, an orthorhombic phase Nd0.95TiO3 appears. Impedance spectra indicates that the substitution of La3+ ions by Nd3+ ions at A sites generates defects, resulting in the enhanced distortions of TiO6 octahedrons. The dielectric relaxation activation energy for these defects is 1.2 eV in temperature range T ≥ 650 ℃. The conductance activation energies are 0.3 eV and 1.0 eV for impure ions/thermions and defects/oxygen vacancies, respectively. The contributions of impure ions/thermions and defects/oxygen vacancies have been distinguished through the analysis of both normalized imaginary impedance Z″ and electrical modulus M″. Their impedance relaxation activation energies in normalized Z″ spectra are 1.3 eV and 0.8 eV, respectively. An enhanced piezoelectric coefficient (d33 = 2.8 pC/N) appears in La1.9Nd0.1Ti2O7 (LNTO-0.1) ceramics.
- Subjects
ACTIVATION energy; DIELECTRIC relaxation; CERAMICS; LEAD-free ceramics; PIEZOELECTRIC ceramics; LEAD titanate; IONS
- Publication
Journal of Materials Science: Materials in Electronics, 2020, Vol 31, Issue 3, p1853
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-019-02704-z