Journal
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Volume 208, Issue 12, Pages 2719-2723Publisher
WILEY-BLACKWELL
DOI: 10.1002/pssa.201127331
Keywords
calcium fluoride; cryogenic temperatures; mechanical loss; ring down
Funding
- German Science Foundation [SFB Transregio 7]
- Science and Technology Facilities Council [ST/I001085/1, Gravitational Waves, PP/F001118/1] Funding Source: researchfish
- STFC [PP/F001118/1, Gravitational Waves, ST/I001085/1] Funding Source: UKRI
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Low mechanical loss materials are in great demand for micro-mechanical applications as well as high precision instrumentation. We describe low mechanical loss measurements of a calcium fluoride (CaF2) bulk sample. A new mechanical relaxation process was observed for frequencies in the range from 31 to 64?kHz and temperatures of 10 to 50?K. The activation energy of this process was found to be 10?meV. This relaxation process increases the mechanical loss significantly and thus sets limits to the application of this material at these temperatures.
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