Exploratory growth and characterization of CaNdAl_(3)O_(7) single crystal with nonsymmetric structure in tetragonal family  

作　　者：Xiangkang Peng Fapeng Yu 

机构地区：[1]State Key Laboratory of Crystal Materials,Institute of Crystal Materials,Shandong University,Jinan,250100,China

出　　处：《Journal of Rare Earths》2025年第1期153-161,I0006,共10页稀土学报(英文版)

基　　金：Project supported by the National Natural Science Foundation of China(52372008);Shandong Provincial Natural Science Foundation(ZR2020KA003,ZR2023QE165)。

摘　　要：The new component of melilite type crystal CaNdAl_(3)O_(7)(CNA)was grown by the Czochralski pulling method.Single crystal structure analysis was conducted.It is found that the CNA crystal belongs to the tetragonal system with P-421m space group.The cell parameters a=b=0.77461 nm and c=0.51089 nm.The density and Mohs hardness of CNA crystal are 4.08 g/cm^(3) and 5.45,respectively.The specific heat of the crystal is 0.57-0.77 J/(g·K)in the temperature range of 30-300℃.X-ray photoelectron spectro scopy(XPS)shows that the crystal has stable atomic valence states and chemical environment.The vibration state of polyhedra groups in the crystal was measured by Raman spectra,and the piezoelectric response was analyzed based on the calculated results for the polyhedra polarization dipole moments.The relative dielectric permittivity of the CNA crystal at room temperature was determined to be 11.80 and the electrical resistivity was measured to be on the order of 5×10^(6)Ω·cm at 800℃.

关 键 词：Piezoelectric MELILITE Crystal growth High-temperature CZOCHRALSKI RAREEARTHS 

分 类 号：O61[理学—无机化学]