Ultrabroadband dielectric spectroscopy and phonons in (Pb1-x/2Lax)(Zr0.9Ti0.1)O3

被引：14

作者：

Buixaderas, E. ^{[1
]}

Bovtun, V. ^{[1
]}

Veljko, S. ^{[1
]}

Savinov, M. ^{[1
]}

Kuzel, P. ^{[1
]}

Gregora, I. ^{[1
]}

Kamba, S. ^{[1
]}

Reaney, I. ^{[2
]}

机构：

[1] ASCR, Inst Phys, Prague 18221 8, Czech Republic

[2] Univ Sheffield, Sheffield S1 3JD, S Yorkshire, England

来源：

JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

LEAD-ZIRCONATE-TITANATE; ENHANCED ANTIFERROELECTRIC STABILITY; TERAHERTZ SPECTROSCOPY; RELAXOR FERROELECTRICS; LANTHANUM MODIFICATION; VIBRATIONAL-MODES; PHASE-TRANSITIONS; POLAR PHONONS; X-RAY; CERAMICS;

D O I：

10.1063/1.3501105

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dielectric behavior of (Pb1-x/2Lax) (Zr0.9Ti0.1)O-3 PLZT 100x/90/10 (0 <= 100x <= 1) was studied in the frequency range 10(2)-10(14) Hz using dielectric, time-domain terahertz (THz), far-infrared, and Raman spectroscopy in the temperature interval 10-900 K. PZT 90/10 and PLZT 2/90/10 undergo two phase transitions, from a cubic paraelectric to a rhombohedral untilted ferroelectric (FE) phase and on further cooling to a tilted FE phase. PLZT 4/90/10 and PLZT 10/90/10 are incommensurately modulated and composed of an intergrowth of polar and antipolar cation displacements. These samples consequently demonstrate a FE soft mode which exhibits minimal frequency several tens of degrees above the nominal antiferroelectric phase transition temperature. The dielectric response of PLZT 100x/90/10 is mainly governed by a gigahertz relaxation and a soft phonon component in the THz range. As in other PbO-based perovskites, the soft mode is split into a higher-frequency component (omega similar to 80 cm(-1)) and a highly damped THz component (omega similar to 30 cm(-1)), with larger dielectric strength already in the paraelectric phase. (C) 2010 American Institute of Physics. [doi:10.1063/1.3501105]

引用

页数：10

共 43 条

[1] Soft Mode Doublet in PbMg1/3Nb2/3O3 Relaxor Investigated with Hyper-Raman Scattering [J].