Dielectric properties and relaxation phenomena in the diffuse ferroelectric phase transition in K3Li2Nb5O15 ceramic

被引：24
作者：
Belboukhari, A. [1 ]
Abkhar, Z. [1 ]
Gagou, Y. [2 ]
Belhadi, J. [2 ]
Elmoznine, R. [3 ]
Mezzane, D. [1 ]
El Marssi, M. [2 ]
Luk'yanchuk, I. [2 ]
机构：
[1] FSTG Univ Cadi Ayyad, LMCN, Marrakech 40000, Morocco
[2] Univ Picardie, LPMC, F-80039 Amiens, France
[3] Univ Chouaib Doukkali, LPMC, FSJ, El Jadida 24000, Morocco
来源：
EUROPEAN PHYSICAL JOURNAL B | 2012年 / 85卷 / 06期
关键词：
ELECTROMECHANICAL PROPERTIES; IMPEDANCE; BEHAVIOR;
D O I：
10.1140/epjb/e2012-21000-1
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Structural and dielectric properties of Potassium Lithium Niobate polycrystalline ceramic K3Li2Nb5O15 (KLN), having the tetragonal tungsten bronze (TTB) - type structure are studied in the temperature interval 50-550 degrees C. Special emphasis is given to the diffuse phase transition occurring around 440 degrees C. Space charge polarization, relaxation phenomena and free charge conductivity have been elucidated using impedance spectroscopy technique. Argand plots have revealed a non Debye and polydispersive type relaxation. In paraelectric phase the Arrhenius activation energy E-tau = 0.533 eV was determined. The structural and dielectric results are compared with two others TTB compounds derived from KLN family: Pb1.85K1.15Li0.15Nb5O15 (PKLN) and GdK2Nb5O15 (GKN).
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页数：9
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