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Thermal expansion behavior of SrSiO3 and Sr2SiO4 determined by high-temperature X-ray diffraction and dilatometry

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Abstract

Strontium silicates are widely known as high thermal expansion materials, especially from glass ceramic sealing applications. However, the thermal expansion behavior of the pure crystalline phases is still unknown. Hence, SrSiO3 and Sr2SiO4 were characterized with dilatometry and high-temperature X-ray diffraction. The measured coefficients of thermal expansion (CTE) of Sr2SiO4 are strongly anisotropic and depending on the crystallographic direction vary between 3.9 and 16.6 × 10−6 K−1. SrSiO3 has a somewhat higher isotropy of thermal expansion than Sr2SiO4. The CTE in the respective crystallographic directions differs by only 1.9 × 10−6 K−1. The mean CTE is between 10.9 and 12.8 × 10−6 K−1 for SrSiO3 and Sr2SiO4, respectively. A comparison of the Sr-phases with Ba- and Ca-phases with the same stoichiometry is given with respect to the crystal structures and the CTE.

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  1. Otto-Schott-Institut für Materialforschung, Jena University, Fraunhoferstr. 6, 07743, Jena, Germany

    Christian Thieme & Christian Rüssel

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  1. Christian Thieme
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  2. Christian Rüssel
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Correspondence to Christian Thieme.

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Thieme, C., Rüssel, C. Thermal expansion behavior of SrSiO3 and Sr2SiO4 determined by high-temperature X-ray diffraction and dilatometry. J Mater Sci 50, 5533–5539 (2015). https://doi.org/10.1007/s10853-015-9100-3

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  • DOI: https://doi.org/10.1007/s10853-015-9100-3

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