Polarization-dominated thermal-electric-mechanical behaviours in GaN ceramics
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In this paper, we have systematically investigated the polarization-dependent thermal-electric-mechanical behaviours in GaN piezoelectric semiconductor ceramics (PSCs). A thermo-piezoelectric semiconductor model is proposed with pyroelectric and thermoelastic as well as piezoelectric couplings. It is shown that polarization has a non-negligible influence on the thermoelectric properties of GaN ceramics. Because the potential barrier caused by pyroelectricity near the hot end suppresses the Seebeck effect, the thermoelectric potential and current of polarized samples obviously decrease with temperature difference. Moreover, it is the intercoupling between pyroelectric polarization and piezoelectric charges that largely affects the bending strength of GaN ceramics. Compared with the ordinary ceramics, the electromechanical and thermoelectric properties of GaN PSCs can be dominated through polarization.
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Influence of polarization on the electromechanical properties of GaN piezoelectric semiconductive ceramicsZhao, M.; Ma, S.; Lu, Chunsheng; Fan, C.; Qin, G. (2018)By using three-point bending tests and numerical simulation, influence of polarization on the electromechanical properties of GaN piezoelectric semiconductive ceramics (PSCs) were investigated in this paper. The results ...
Qin, G.; Zhang, X.; Lu, Chunsheng; Fan, C.; Zhao, M. (2019)In this paper, the effect of an applied electric field on fracture toughness of polarized GaN piezoelectric semiconductor ceramics was studied by using experimental and numerical methods. The results show that fracture ...
Zhao, M.H.; Wang, Y.; Guo, C.K.; Lu, Chunsheng ; Xu, G.T.; Qin, G.S. (2021)By using theoretical analysis and three-point bending experiments, influence of temperature on the bending strength of GaN ceramics is investigated. Based on the critical fracture energy density, a simple and effective ...