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Mechanical Properties of CaF2 Single Crystal Substrates Determined from Nanoindentation Techniques

Published online by Cambridge University Press:  15 February 2011

A. Aruga ,
R. B. Inturi ,
J. A. Barnard  and
R. C. Bradt
A. Aruga
Affiliation:
Department of Materials Science and Engineering, National Defense Academy, Yokosuka 239, Japan
R. B. Inturi
Affiliation:
Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487–0202
J. A. Barnard
Affiliation:
Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487–0202
R. C. Bradt
Affiliation:
Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487–0202
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Abstract

CaF2 single crystals are interesting substrate materials for deposition of thin films. Its structure is cubic and it cleaves on {111} planes. CaF2, whose hardness has been reported to be 4 on the Moh's scale, is plastic and soft. In this study, the mechanical properties such as hardness(H) and Young's modulus(E) of single crystal CaF2 mineral were measured by using a nanoindenter with a Berkovich indenter normal to (100) and (111) planes. A normal indentation size effect (ISE) in accordance with the traditional power law and the proportional specimen resistance model (PSR) of Li and Bradt [1] was observed. The values of E and H on (100) plane are larger than those on (111) plane and these values on both planes decrease with increase in time during the hold segment. The effect of displacement rate on mechanical properties of (100) and (111) surfaces is also studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 436: Symposium CC – Thin Films Stresses and Mechanical Properties VI , 1996 , 213
Copyright
Copyright © Materials Research Society 1997

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