Relaxor behavior of K0.5la0.5Bi2Nb 2O9 ceramics

C. Karthik; N. Ravishankar; K. B.R. Varma; Mario Maglione; R. Vondermuhll; J. Etourneau

doi:10.1063/1.2234848

Relaxor behavior of K_0.5la_0.5Bi₂Nb ₂O₉ ceramics

C. Karthik
, N. Ravishankar
, K. B.R. Varma
, Mario Maglione
, R. Vondermuhll
, J. Etourneau

Materials Research Centre
Indian Institute of Science Bangalore
Université Bordeaux 1

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

K_0.5La_0.5Bi₂Nb₂O₉, a relaxor, was synthesized and the structural studies confirmed it to be an n = 2 member of the Aurivillius oxides. The 1/2{h00} and 1/2{hk0} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein E_a=0.04 eV, T _f=428 K,and ω₀=10¹⁰Hz. The diffuseness parameter γ= 2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d₃₁ coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.

Original language	English
Article number	042905
Journal	Applied Physics Letters
Volume	89
Issue number	4
DOIs	https://doi.org/10.1063/1.2234848
State	Published - 2006
Externally published	Yes

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title = "Relaxor behavior of K0.5la0.5Bi2Nb 2O9 ceramics",

abstract = "K0.5La0.5Bi2Nb2O9, a relaxor, was synthesized and the structural studies confirmed it to be an n = 2 member of the Aurivillius oxides. The 1/2\{h00\} and 1/2\{hk0\} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein Ea=0.04 eV, T f=428 K,and ω0=1010Hz. The diffuseness parameter γ= 2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d31 coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.",

author = "C. Karthik and N. Ravishankar and Varma, \{K. B.R.\} and Mario Maglione and R. Vondermuhll and J. Etourneau",

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doi = "10.1063/1.2234848",

language = "English",

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number = "4",

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TY - JOUR

T1 - Relaxor behavior of K0.5la0.5Bi2Nb 2O9 ceramics

AU - Karthik, C.

AU - Ravishankar, N.

AU - Varma, K. B.R.

AU - Maglione, Mario

AU - Vondermuhll, R.

AU - Etourneau, J.

PY - 2006

Y1 - 2006

N2 - K0.5La0.5Bi2Nb2O9, a relaxor, was synthesized and the structural studies confirmed it to be an n = 2 member of the Aurivillius oxides. The 1/2{h00} and 1/2{hk0} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein Ea=0.04 eV, T f=428 K,and ω0=1010Hz. The diffuseness parameter γ= 2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d31 coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.

AB - K0.5La0.5Bi2Nb2O9, a relaxor, was synthesized and the structural studies confirmed it to be an n = 2 member of the Aurivillius oxides. The 1/2{h00} and 1/2{hk0} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein Ea=0.04 eV, T f=428 K,and ω0=1010Hz. The diffuseness parameter γ= 2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d31 coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.

UR - https://www.scopus.com/pages/publications/33746601883

U2 - 10.1063/1.2234848

DO - 10.1063/1.2234848

M3 - Article

AN - SCOPUS:33746601883

SN - 0003-6951

VL - 89

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 4

M1 - 042905

ER -

Relaxor behavior of K_0.5la_0.5Bi₂Nb ₂O₉ ceramics

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