Elastic and anelastic relaxations in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O3: I. Strain analysis and a static order parameter.
作者： M A Carpenter , J F J Bryson , G Catalan , C J Howard
DOI: 10.1088/0953-8984/24/4/045901
关键词: Condensed matter physics 、 Neutron scattering 、 Softening 、 Phase transition 、 Ferroelectricity 、 Materials science 、 Quasistatic process 、 Spectral line 、 Elasticity (economics) 、 Lattice constant
摘要: The structural evolution of Pb(Mg1/3Nb2/3)O3 (PMN) has been reviewed in terms characteristic temperatures, length scales and timescales, with a view to considering the overall relaxor behaviour from perspectives strain elasticity. A conventional analysis lattice parameter data spontaneous strain/order coupling shows that even though normal phase transition does not occur ordering process is accompanied by significant volume which follows pattern static order evolving according expected for tricritical Tc ≈ 350 K. This matches intensity elastic central peak neutron scattering spectra, reflects development (or quasistatic) polar nanoregions (PNRs) as if mean-field transition. Use Landau free energy expansion, includes components describe ferroelectric contributions an cation together their formal strain, then allows softening cubic → rhombohedral be anticipated. extent observed differs this serves highlight additional roles local heterogeneity relaxation dynamics determining properties PMN.
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