Sapphire dilatometer cell for measuring the thermal expansion of solids

Capacitive-based dilatometry is used to determine the thermal expansion of solid specimens over a broad temperature range and for the study of structural and thermodynamic phase transitions. It can detect length changes of 0.1 Å or better. Dilatometer cells have been constructed of metals, such as c...

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Bibliographic Details
Published in:Review of scientific instruments 2022-06, Vol.93 (6), p.063903-063903
Main Authors: Neumeier, J. J., Nelson, Genevieve A.
Format: Article
Language:English
Subjects:
Dilatometry
Extensometers
Fused silica
Phase transitions
Sapphire
Scientific apparatus & instruments
Silver
Thermal conductivity
Thermal expansion
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Description
Summary:Capacitive-based dilatometry is used to determine the thermal expansion of solid specimens over a broad temperature range and for the study of structural and thermodynamic phase transitions. It can detect length changes of 0.1 Å or better. Dilatometer cells have been constructed of metals, such as copper or silver, and non-metals, such as silicon and fused silica. Sapphire is a good candidate for the construction of a dilatometer cell. It has excellent thermal conductivity, a well-behaved thermal expansion of moderate magnitude, especially below ∼60 K, and is readily available. The design, fabrication, and testing of a sapphire dilatometer cell are described herein.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0091377