Premium
Investigation of Improved Reliability in BaTiO 3 ‐Based Ceramics via Two‐Step Sintering by Impedance Spectroscopy and Schottky Barrier Model
Author(s) -
Zhao Qiancheng,
Gong Huiling,
Wang Xiaohui,
Li Longtu
Publication year - 2018
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.201800168
Subject(s) - sintering , materials science , dielectric spectroscopy , schottky barrier , ceramic , grain boundary , composite material , analytical chemistry (journal) , grain size , dopant , acceptor , doping , microstructure , optoelectronics , chemistry , condensed matter physics , chromatography , physics , electrode , electrochemistry , diode
The ceramics prepared by conventional sintering (CS) method and two‐step sintering (TSS) method are investigated in the temperature range of 490–570 °C through impedance spectroscopy, which is correlated with the improved reliability of TSS specimen. There is an improvement in the resistances ( R g and R gb ) of TSS specimen mainly due to the reduced grain size. And according to the grain boundary double Schottky barrier model, not merely the smaller potential barrier height ( Ф gb ) but also the larger depletion layer thickness ( δ gb ) for TSS specimen indicate that the effective concentration of charged acceptor dopants and hence oxygen vacancy concentration in TSS specimen are much lower than these in CS specimen. These facts can account for the improved reliability in BaTiO 3 ‐based ceramics via two‐step sintering.