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Electrical Properties of La 2− x Ce x Ti 2 O 7 ( x = 0–0.1) Ceramics
Author(s) -
Li Yueyi,
Jiang Laiming,
Jiao Zhifeng,
Liang Dayun,
Chen Qiang,
Zhu Jianguo
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900685
Subject(s) - materials science , ceramic , dopant , monoclinic crystal system , electrical resistivity and conductivity , microstructure , temperature coefficient , activation energy , sintering , ion , analytical chemistry (journal) , piezoelectricity , phase (matter) , mineralogy , crystal structure , crystallography , chemistry , doping , composite material , optoelectronics , electrical engineering , engineering , organic chemistry , chromatography
As an important functional material, the applications of piezoelectric materials have shifted from convenient use to service in extreme environments. Herein, a new layered high‐temperature ceramic La 2 Ti 2 O 7 (LTO) with the substitution of La 3+ ions by Ce 3+ ions at A sites is designed and synthesized using the conventional solid‐state sintering technology. The effects of dopant Ce 3+ ions on the microstructure, phase structure, and electrical properties of LTO are investigated methodically. Moderate dopant Ce 3+ ions decrease the concentration of thermions in LTO ceramics, but excess dopant Ce 3+ ions can lead to cell distortions, which have some relationships with defects. Through analysis, the La 1.95 Ce 0.05 Ti 2 O 7 (LCTO‐0.05) ceramics with a pure monoclinic phase possess optimal electrical properties. At 650 °C, the enhanced fitted direct current (DC) resistivity of the LCTO‐0.05 ceramics is 1.5 × 10 6 Ω cm. The activation energy of conductivity and relaxation activation energy of imaginary impedance Z″ for LCTO‐0.05 ceramics are 1.12 and 1.16 eV, respectively, in the high‐temperature regime. The piezoelectric coefficient d 33 of LCTO‐0.05 ceramics is up to 3.6 pCN −1 . It is believed that this ceramic system promotes the development of LTO‐based high‐temperature piezoelectric ceramics.