Weak-relaxor behaviour in Bi/Yb-doped KNbO3 ceramics

LUISMAN, Luke, FETEIRA, Antonio and REICHMANN, Klaus (2011). Weak-relaxor behaviour in Bi/Yb-doped KNbO3 ceramics. Applied Physics Letters, 99 (19), p. 192901.

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Abstract

Weak-relaxor behaviour was observed in K(1-x)Bi(x)Nb(1-x)YbxO(3) ceramics with x = 0.20 and x 0.30. According to x-ray diffraction analysis, the crystal structure of these ceramics can be described by the cubic centrosymmetric Pm-(3) over barm space group; however Raman spectroscopy reveals both the occurrence of local lattice distortions and the disruption of the long-range ferroelectric order. The local lattice strain caused by the larger Yb3+ combined with the presence of Bi3+, which lone-pair of electrons induces further local distortions, gives rise to polar nanoregions (PNRs). Nevertheless, the interaction between the PNRs appears weak and proper relaxor behaviour does not develop.

Item Type:	Article
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:	10.1063/1.3660255
Depositing User:	Helen Garner
Date Deposited:	31 May 2012 14:34
Last Modified:	31 May 2012 15:59
URI:	http://shura.shu.ac.uk/id/eprint/5288

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