Low temperature Raman scattering study of barium doped lead ytterbium tantalate ceramics

作     者：Dibyaranjan Rout Swetapadma Praharaj V.Subramanian V.Sivasubramanian 

作者机构：Department of PhysicsSchool of Applied SciencesKIIT University Bhubaneswar-751024OdishaIndia Department of PhysicsIndian Institute of TechnologyMadras Chennai-600036India Materials Science DivisionIGCARKalpakkam-603102India 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2017年第7卷第1期

页      面：17-21页

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 070301[理学-无机化学] 0702[理学-物理学] 

主　　题：Perovskite oxides B-site ordering Raman scattering soft mode 

摘      要：Raman spectra of a complex perovskite system(Pb_(1-x)Ba_(x))(Yb_(0.5)Ta_(0.5))O_(3),x=0.0;0.1 and 0.2 have been studied at low temperature in the range of 10–250 *** fascination of the system is that it undergoes a crossover from a highly ordered antiferroelectric(x=0.0)to ferroelectric(x=0.1)to disordered relaxor ferroelectric(x=0.2).The nature of splitting that prevails in F_(2g)(≈60 cm^(-1)),F_(1g)(≈538 cm^(-1))modes and their gradual merging and disappearance with x indicates an orthorhombic symmetry for x=0.0 and a pseudo-cubic structure for x=*** mode at 420 cm^(-1) suggests the existence of rhombohedral distortion in all the *** soft mode behavior of the F2g modes has been analyzed by fitting the data with the power law ω_(s)=A(T_(C)-T)^(β).