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Local structure and dynamics in relaxor-ferroelectric PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 single crystals
Local structural arrangements and corresponding dynamical effects in relaxor ferroelectrics PbSc1/2Nb1/2O3 and PbSc1/2Ta1/2O3 were studied by Raman spectroscopy. Polarized Raman spectra of singleExpand
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Phase transition(s) in titanite CaTiSiO5: An infrared spectroscopic, dielectric response and heat capacity study
The structural phase transition in titanite near 500 K (averaged symmetries A2/a→P21/a) and a second anomaly around 900 K have been studied using infrared spectroscopy on single crystals aqnd powderExpand
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Phase transitions in Pb3(P1-xAsxO4)2: influence of the central peak and flip mode on the Raman scattering of hard modes
The integrated intensities and full width at half maximum (FWHM) of the 80 cm-1 Raman bands (hard modes) of ferroelastic Pb3(PO4)2 and Pb3(P0.77As0.23O4)2 were investigated in both the ferro andExpand
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Analysis of short and long range atomic order in nanocrystalline diamonds with application of powder diffractometry
Abstract Fundamental limitations, with respect to nanocrystalline materials, of the traditional elaboration of powder diffraction data like the Rietveld method are discussed. A tentative method ofExpand
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Ferroelastic phases in Pb3(PO4)2–Pb3(AsO4)2; X-ray and optical experiments
Mixed crystals Pb3(PO4)2--Pb3(AsO4)2 are ferroelastic at low temperatures. The phase diagram contains three different phases a (paraelastic), \tt b and \tt c (both ferroelastic). The transformationExpand
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Wall-related Raman scattering in ferroelastic lead phosphate Pb3(PO4)2
Micro-Raman spectroscopy is applied to study structural changes in the vicinity of the domain walls in ferroelastic lead phosphate Pb3(PO4)2. The Raman spectra measured in untwinned and in heavilyExpand
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Elastic softening of metamict titanite CaTiSiO5: Radiation damage and annealing
Abstract We have measured the elastic response of radiation-damaged titanite, CaTiSiO5, as a function of thermal annealing. We estimate the bulk modulus of the damaged samples (-24% amorphous) to beExpand
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Evidence for direct impact damage in metamict titanite CaTiSiO₅.
We have measured the dose dependence of the degree of amorphization of titanite, CaTiSiO(5). Titanite is an often metamict mineral which has been considered as a matrix for the encapsulation ofExpand
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Ferroic clustering and phonon anomalies in Pb-based perovskite-type relaxors
The phonon anomalies and their relationship to the structural inhomogeneities in Pb-based relaxors are studied on the basis of stoichiometric PbSc0.5Ta 0.5O3 and PbSc0.5Nb0.5O3 and Nb-, Sn- andExpand
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The crystal structure of Cd(2)Nb(2)O(7): symmetry mode analysis of the ferroelectric phase.
The crystal structure of the ferroelectric Cd(2)Nb(2)O(7) (CNO) has been determined down to T = 98 K using synchrotron radiation. Low temperature structure refinement is conducted in space group ImaExpand
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