标题：Growth and property characterization of CaNdGa3O7 and SrNdGa3O7 melilite single crystals
作者：Shen, Chuanying;Zhang, Shujun;Wang, Duanliang;Xu, Tianxiang;Yu, Haohai;Cao, Wenwu;Wang, Jiyang;Zhang, Huaijin
作者机构：[Shen, C] State Key Laboratory of Crystal Materials, Institute of Crystal Materials, Shandong University, Jinan, Shandong, 250100, China, Materials Re 更多
通讯作者地址：[Shen, CY]Shandong Univ, Inst Crystal Mat, State Key Lab Crystal Mat, Jinan 250100, Peoples R China.
摘要：Piezoelectric CaNdGa3O7 and SrNdGa3O7 single crystals with the melilite structure were successfully grown by the Czochralski technique. The thermal properties of these crystals have been systematically investigated. A full matrix of electromechanical material constants was measured by the IEEE resonance method, with k\'(12) and d(14) being on the order of 12.5-14.0% and 9.3-9.4 pC N-1, respectively. A relationship between the physical properties and microstructures was established to explain the anisotropic properties of melilite crystals. In addition, the GaO4 tetrahedral layers, acting as barriers against charge transport, account for the high electrical resistivity along the Z-axis. The high thermal stability of the elastic constants and piezoelectric coefficients of SrNdGa3O7 over the temperature range of 25-600 degrees C together with its high resistivity on the order of 9.2 x 10(6) ohm cm at 600 degrees C make it a promising candidate for piezoelectric sensing applications at high temperatures.