CAJ | 학술논문

我们报道了用高分辨布里渊散射,确定0.67Pb(Mg 1/3Nb 2/3)O3-0.33PbTiO3单晶中的弹性、压电和介电常数.所有的实验数据都是在一块沿[001]方向的极化的单晶样品上获得的.我们实验中得到的这些常数的数值和以往超声共振技术获得的数值相似.我们还研究了压缩模和剪切模在(010)和(001)平面内的方向依赖性.TA1和TA2模式的强度对散射角度有很强列依赖性.在散射角度为45°～65°内,一个新的峰出现在～18 GHz附近.它可能与晶体中的微观不均匀性或者局域微结构相关.
아문보도료용고분변포리연산사,학정0.67Pb(Mg 1/3Nb 2/3)O3-0.33PbTiO3단정중적탄성、압전화개전상수.소유적실험수거도시재일괴연[001]방향적겁화적단정양품상획득적.아문실험중득도적저사상수적수치화이왕초성공진기술획득적수치상사.아문환연구료압축모화전절모재(010)화(001)평면내적방향의뢰성.TA1화TA2모식적강도대산사각도유흔강렬의뢰성.재산사각도위45°～65°내,일개신적봉출현재～18 GHz부근.타가능여정체중적미관불균균성혹자국역미결구상관.
We report the determination of the complete set of elastic, piezoelectric and dielectric constants of 0.67PMN-0.33PT crystal by using high-resolution Brillouin scattering in which all experimental data were collected from only one [001]-poled crystal sample. The values of determined constants are similar to those previously determined from four crystal samples by using a hybrid method combining both ultrasonic and resonant techniques. The directional dependence of the compressional and shear modulus of the crystal in (010) and (001) planes were investigated. The scattering intensities of TA1 and TA2 modes show a strong dependence on the scattering angle. A new feature appears at the low frequency side (～18 GHz) between 45°～65° scattering angles and it may be related to the microheterogeneity or to a local microstructural change and some defect states in the crystal.