Open AccessInfluences of Y- and La-dopant on the thermal conductive properties and dielectric relaxation of Al2O3-based ceramics
Author(s) -
Wu Jun-Bo,
XinGui Tang,
Zhenhua Jia,
Chen Dong-Ge,
Yanping Jin,
Qiu-Xiang Liu
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.207702
Subject(s) - materials science , ceramic , dielectric , dopant , relaxation (psychology) , sintering , doping , diffraction , electrical conductor , electrical resistivity and conductivity , thermal , composite material , mineralogy , thermodynamics , optoelectronics , optics , chemistry , psychology , social psychology , physics , electrical engineering , engineering
Al2O3 ceramics doping with Y3+ and La3+ are synthesized by conventional solid state reaction method. The structures, thermal conductivities properties and the effects of sintering temperature on the electrical properties of the samples are measured. X-ray diffraction results indicate that all the ceramics are formed to be of pure solid solution when the samples are sintered at 1500℃. Thermal conductivities of Al2O3 ceramics reach up to 8.60 W/(m· K). All the ceramics show temperature-stable dielectric characteristics. Typical dielectric relaxation behaviors are observed in Y- and La-doped Al2O3 ceramics, and the relaxation mechanism is also analyzed.