Briullouin scattering in superionic compounds : NdF3and CaF2(ReF3)

Mjwara, P. M.; Comins, J. D.; Ngoepe, Phuti E.; Chadwick, Alan V.

doi:10.1080/10420159108224882

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…The sample is contained in an inert gas atmosphere to avoid chemical reactions. In order to minimize possible temperature gradients, the measurements are sometimes performed placing the samples in ovens with small surface windows for optic access (preferentially) in backscattering and 90° scattering geometry (Harley et al 1978;Mjwara et al 1991). The temperature at the sample position is usually measured with a thermocouple.…”

Section: Brillouin Scattering At Extreme Conditionsmentioning

confidence: 99%

Brillouin Scattering and its Application in Geosciences

Speziale

Marquardt

Duffy

2014

Reviews in Mineralogy and Geochemistry

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Section: Brillouin Scattering At Extreme Conditionsmentioning

confidence: 99%

Brillouin Scattering and its Application in Geosciences

Speziale

Marquardt

Duffy

2014

Reviews in Mineralogy and Geochemistry

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Light scattering and computer simulation studies of superionic pure and La-doped BaF2

et al. 2016

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Behavior of elastic constants, refractive index, and lattice parameter of cubic zirconia at high temperatures

Botha

Chiang

Comins

et al. 1993

Journal of Applied Physics

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Acoustic mode frequency, lattice parameter, and refractive index measurements have been carried out on single crystals of cubic stabilized zirconia, ZrO2(xY2O3), in the temperature range 300 to 1450 K, using Brillouin scattering, x-ray diffraction, and interferometric methods, respectively. Elastic constants Cij and associated quantities such as the bulk modulus B=(C11+2C12)/3, the anisotropy ratio A=2C44/(C11−C12), and the Cauchy relation failure Δ=(C12−C44) have been determined from these measurements. The results show a linear reduction in C11 , C12 , and C44 until a characteristic transition temperature Tc, which depends on the dopant concentration x. The linear decrease is understood in terms of normal thermal expansion. Above Tc (1300 K for x=9.4 mol % and 1050 K for x=24 mol %) there are elastic anomalies; significant reductions in C11, (C11-C12)/2 and C44 occur, with an increase in C12 . These effects are considered to result from thermally generated disorder. Detailed examination of the temperature dependence of the Cij as well as B, A, and Δ show some similarities, but also significant differences in comparison with the anomalous elastic behavior corresponding to the high-temperature superionic state of fluorites. The thermally created defect structures formed at high temperatures in cubic zirconia are thus considered to be different from the anion Frenkel disorder formed in fluorites; this is in accord with recent results from computational simulations and high-temperature neutron scattering.

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Briullouin scattering in superionic compounds : NdF₃and CaF₂(ReF₃)

Cited by 4 publications

References 6 publications

Brillouin Scattering and its Application in Geosciences

Brillouin Scattering and its Application in Geosciences

Light scattering and computer simulation studies of superionic pure and La-doped BaF2

Behavior of elastic constants, refractive index, and lattice parameter of cubic zirconia at high temperatures

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