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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) |
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container_title | Physical review. B, Condensed matter and materials physics |
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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{<=}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.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PHYSREVB.74.134103</identifier><language>eng</language><publisher>United States</publisher><subject>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</subject><ispartof>Physical review. 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B, Condensed matter and materials physics</title><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{<=}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. 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B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schefer, J.</au><au>Pomjakushin, V.</au><au>Stuhr, U.</au><au>Schaniel, D.</au><au>Woike, Th</au><au>Petricek, V.</au><au>Woehlecke, M.</au><au>Imlau, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>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</atitle><jtitle>Physical review. B, Condensed matter and materials physics</jtitle><date>2006-10-01</date><risdate>2006</risdate><volume>74</volume><issue>13</issue><issn>1098-0121</issn><eissn>1550-235X</eissn><abstract>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{<=}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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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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