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Structural properties of Sr{sub 0.61}Ba{sub 0.39}Nb{sub 2}O{sub 6} in the temperature range 10-500 K investigated by high-resolution neutron powder diffraction and specific heat measurements

We report high-resolution neutron powder diffraction on Sr{sub 0.61}Ba{sub 0.39}Nb{sub 2}O{sub 6} in the temperature range 15-500 K. The results indicate that the low-temperature anomalies (T{

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-10, Vol.74 (13)
Main Authors: Schefer, J., Pomjakushin, V., Stuhr, U., Schaniel, D., Woike, Th, Petricek, V., Woehlecke, M., Imlau, M.
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container_title Physical review. B, Condensed matter and materials physics
container_volume 74
creator Schefer, J.
Pomjakushin, V.
Stuhr, U.
Schaniel, D.
Woike, Th
Petricek, V.
Woehlecke, M.
Imlau, M.
description We report high-resolution neutron powder diffraction on Sr{sub 0.61}Ba{sub 0.39}Nb{sub 2}O{sub 6} in the temperature range 15-500 K. The results indicate that the low-temperature anomalies (T{
doi_str_mv 10.1103/PHYSREVB.74.134103
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The results indicate that the low-temperature anomalies (T{&lt;=}100 K) observed in the dielectric dispersion are due to small changes in the incommensurate modulation of the NbO{sub 6} octahedra, as no structural phase transition of the average structure was observed. This interpretation is supported by specific heat measurements, which show no latent heat, but a glass-like behavior at low temperatures. Furthermore, we find that the structural changes connected with the ferroelectric phase transition at T{sub c}{approx_equal}350 K start already at 200 K, explaining the anisotropic thermal expansion in the temperature range 200-300 K observed in a recent x-ray diffraction study.</abstract><cop>United States</cop><doi>10.1103/PHYSREVB.74.134103</doi></addata></record>
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects ANISOTROPY
BARIUM COMPOUNDS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
FERROELECTRIC MATERIALS
MODULATION
NEUTRON DIFFRACTION
NIOBATES
PERMITTIVITY
PHASE TRANSFORMATIONS
RESOLUTION
SPECIFIC HEAT
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
THERMAL EXPANSION
X-RAY DIFFRACTION
title Structural properties of Sr{sub 0.61}Ba{sub 0.39}Nb{sub 2}O{sub 6} in the temperature range 10-500 K investigated by high-resolution neutron powder diffraction and specific heat measurements
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