Morphotropic phase-boundary-like characteristic in a lead-free and non-ferroelectric (1-x)NaNbO3-xCaTiO3 system

Tripathi, Saurabh ; Pandey, Dhananjai ; Mishra, Sanjay Kumar ; Krishna, P. S. R. (2008) Morphotropic phase-boundary-like characteristic in a lead-free and non-ferroelectric (1-x)NaNbO3-xCaTiO3 system Physical Review B, 77 (5). 052104_1-052104_4. ISSN 1098-0121

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Official URL: http://link.aps.org/doi/10.1103/PhysRevB.77.052104

Related URL: http://dx.doi.org/10.1103/PhysRevB.77.052104

Abstract

We report here an anomalous peak in the composition dependence of the dielectric permittivity of non-ferroelectric (1-x)NaNbO3-xCaTiO3 ceramics for the composition range 0.10<x<0.20. This is reminiscent of a similar phenomenon in the ferroelectric morphotropic phase boundary ceramics. Rietveld analysis of the powder x-ray diffraction data for various compositions reveals that this peak is linked with a change of crystal structure from one orthorhombic phase in the Pbma space group for 0 x 0.10 to another orthorhombic phase in the Pbnm space group for x 0.20 through an intermediate long period modulated orthorhombic phase whose lattice parameter is ~14 times the lattice parameter of the Pbnm phase of CaTiO3 in the [010] direction (q~[0,1/14,0]).

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:27229
Deposited On:10 Dec 2010 12:55
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