Cargando…
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...
Autores principales: | , |
---|---|
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 |
_version_ | 1783249957593022464 |
---|---|
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. |
format | Online Article Text |
id | pubmed-5509077 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT thiemechristian negativethermalexpansioninba05sr05zn2sigeo7 AT russelchristian negativethermalexpansioninba05sr05zn2sigeo7 |