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Nanostructural-property relations in complex lead perovskites
Clive A. Randall,Amar S. Bhalla +1 more
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In this paper, a correlation between the nanoscale B-site order and relaxor on glassy ferroelectric behavior is found in these lead perovskites, and a hypothesis is suggested which relates 0-3 polar connectivity to order-disorder connectivity.Abstract:
From transmission electron microscopy studies on several complex lead perovskite compounds Pb(B'B'')O3, and their solid solutions a classification can be obtained based on B-cation order. This classification divides the complex lead perovskites into three subgroups; random occupation or disordered, nanoscale or short coherent long-range order and long coherent long-range order of B-site cations. A correlation between the nanoscale B-site order and relaxor on glassy ferroelectric behavior is found in these lead perovskites. An hypothesis is suggested which relates 0-3 polar connectivity to 0-3 order-disorder connectivity. This hypothesis is discussed with relation to present theories [G. A. Smolenskii: J. Phys. Soc. Jpn. (1970) Suppl., p. 26, L. E. Cross: Ferroelectrics 76 (1987) 241, T. L. Renieke and K. L. Ngai: Solid State Commun. 18 (1973) 1543] and reported experimental results of the perovskite relaxor ferroelectrics.read more
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Dielectric and Raman studies of (BaxPb1−x)(Yb0.5Nb0.5)O3
TL;DR: In this article, Raman spectra of the solid solution series (BaxPb1−x)(Yb0.5Nb 0.5)O3 from x = 0.0 to 0.3 have been analyzed and a new mode at 420 cm−1 is observed for the compounds with Ba2+ substitution.
Journal ArticleDOI
DEGREE OF DIFFUSED PHASE TRANSITION AND NON-DEBYE DIELECTRIC RELAXATION IN Ba(NdxTi1-2xNbx)O3 CERAMICS
TL;DR: In this paper, the degree of relaxor behavior and diffuseness of phase transition were correlated to the cationic disorder at lattice site B, and a modified Arrhenius relation was found to best describe the frequency dependent dielectric maxima temperature.
Journal ArticleDOI
The Raman scattering in relaxor ferroelectrics
TL;DR: The Raman spectra of the relaxor ferroelectrics in the single crystals PbMg 1/3 Nb 2/3 O3(PMN), PMT, PbZnl/3Nb2/3O3(PZN) and PbNi1/3 nb2 /3O 3 (PNN) have been measured in the frequency range up to 1000 cm −1 and in the temperature range between 100 K and 773 K.
Journal ArticleDOI
Investigation of glassy behaviour of flux grown Pb(Zn1/3Nb2/3)0.91Ti0.09O3 crystal
Budhendra Singh,Binay Kumar +1 more
TL;DR: In this paper, the glassy behavior of flux grown single crystal of relaxor based lead zinc niobium titanate near its morphotropic phase boundary has been investigated and the frequency dependence of temperature at dielectric maxima (T′m) was analyzed using different glass models and Power law.
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Relaxational and Vibrational Dynamics of 0.44Pb(Mg1/3Nb2/3)O3-0.56PbTiO3 Single Crystal Probed by Micro-Raman Scattering
Al Helal,Seiji Kojima +1 more
TL;DR: In this paper, Ramaman scattering of a 0.44Pb(Mg1/3Nb2/3)O3-0.56PbTiO3 (PMN-56PT) single crystal was measured to examine the growing process of polar nanoregions (PNRs) of a PT-rich relaxor in a paraelectric cubic phase.
References
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Incommensurate structures in highly ordered complex perovskites Pb(Co1/2W1/2)O3 and Pb(Sc1/2Ta1/2)O3.
TL;DR: Evidence for an incommensurate phase within the antiferroelectric and ferroelectric phase, respectively is revealed and a possible ``lock-in'' transition is found in Pb (${\mathrm{Sc}}_{1/2}$) and Pb (£3), but the incommonsurate to commensurate transition seems to be dependent on the degree of B-site order.
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