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Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)

Solid solutions with the composition Ba(0.5)Sr(0.5)Zn(2)Si(2-x)Ge(x)O(7) and BaZn(2)Si(2-x)Ge(x)O(7) were prepared with different values of x using a conventional mixed oxide route. Both compounds exhibit very different thermal expansion, which is due to the different crystal structures. Ba(0.5)Sr(0...

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Detalles Bibliográficos
Autores principales: Thieme, Christian, Rüssel, Christian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5509077/
https://www.ncbi.nlm.nih.gov/pubmed/28773746
http://dx.doi.org/10.3390/ma9080631
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author Thieme, Christian
Rüssel, Christian
author_facet Thieme, Christian
Rüssel, Christian
author_sort Thieme, Christian
collection PubMed
description Solid solutions with the composition Ba(0.5)Sr(0.5)Zn(2)Si(2-x)Ge(x)O(7) and BaZn(2)Si(2-x)Ge(x)O(7) were prepared with different values of x using a conventional mixed oxide route. Both compounds exhibit very different thermal expansion, which is due to the different crystal structures. Ba(0.5)Sr(0.5)Zn(2)Si(2-x)Ge(x)O(7) solid solutions exhibit the structure of high-temperature BaZn(2)Si(2)O(7) and show negative thermal expansion, which was proven via high-temperature X-ray diffraction. Up to around x = 1, the crystal structure remains the same. Above this value, the low-temperature phase becomes stable. The Sr-free solid solutions have the crystal structure of low-temperature BaZn(2)Si(2)O(7) and show also a limited solubility of Ge. These Sr-free compositions show transitions of low- to high-temperature phases, which are shifted to higher temperatures with increasing Ge-concentration.
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spelling pubmed-55090772017-07-28 Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7) Thieme, Christian Rüssel, Christian Materials (Basel) Communication Solid solutions with the composition Ba(0.5)Sr(0.5)Zn(2)Si(2-x)Ge(x)O(7) and BaZn(2)Si(2-x)Ge(x)O(7) were prepared with different values of x using a conventional mixed oxide route. Both compounds exhibit very different thermal expansion, which is due to the different crystal structures. Ba(0.5)Sr(0.5)Zn(2)Si(2-x)Ge(x)O(7) solid solutions exhibit the structure of high-temperature BaZn(2)Si(2)O(7) and show negative thermal expansion, which was proven via high-temperature X-ray diffraction. Up to around x = 1, the crystal structure remains the same. Above this value, the low-temperature phase becomes stable. The Sr-free solid solutions have the crystal structure of low-temperature BaZn(2)Si(2)O(7) and show also a limited solubility of Ge. These Sr-free compositions show transitions of low- to high-temperature phases, which are shifted to higher temperatures with increasing Ge-concentration. MDPI 2016-07-27 /pmc/articles/PMC5509077/ /pubmed/28773746 http://dx.doi.org/10.3390/ma9080631 Text en © 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Thieme, Christian
Rüssel, Christian
Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title_full Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title_fullStr Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title_full_unstemmed Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title_short Negative Thermal Expansion in Ba(0.5)Sr(0.5)Zn(2)SiGeO(7)
title_sort negative thermal expansion in ba(0.5)sr(0.5)zn(2)sigeo(7)
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5509077/
https://www.ncbi.nlm.nih.gov/pubmed/28773746
http://dx.doi.org/10.3390/ma9080631
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