Next Article in Journal
Controlling Pickering Emulsion Destabilisation: A Route to Fabricating New Materials by Phase Inversion
Next Article in Special Issue
Fundamentals of Thermal Expansion and Thermal Contraction
Previous Article in Journal
Electrospun Scaffolds for Corneal Tissue Engineering: A Review
Open AccessCommunication

Negative Thermal Expansion in Ba0.5Sr0.5Zn2SiGeO7

Otto-Schott-Institut für Materialforschung, Jena University, Fraunhoferstr. 6, Jena 07743, Germany
Author to whom correspondence should be addressed.
Academic Editor: Tamas Varga
Materials 2016, 9(8), 631;
Received: 30 June 2016 / Revised: 16 July 2016 / Accepted: 21 July 2016 / Published: 27 July 2016
(This article belongs to the Special Issue Negative Thermal Expansion Materials)
Solid solutions with the composition Ba0.5Sr0.5Zn2Si2-xGexO7 and BaZn2Si2-xGexO7 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. Ba0.5Sr0.5Zn2Si2-xGexO7 solid solutions exhibit the structure of high-temperature BaZn2Si2O7 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 BaZn2Si2O7 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. View Full-Text
Keywords: X-ray diffraction; negative thermal expansion; phase transition X-ray diffraction; negative thermal expansion; phase transition
Show Figures

Figure 1

MDPI and ACS Style

Thieme, C.; Rüssel, C. Negative Thermal Expansion in Ba0.5Sr0.5Zn2SiGeO7. Materials 2016, 9, 631.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop