Abstract
The thermodynamic theory of solids is generalized to take explicit account of internal strains in perfect non-Bravais crystals. Treating external and internal strains as independent leads to the definition of generalized thermodynamic properties, namely elastic constants, heat capacities, thermal expansion coefficients and Gruneisen parameters. Expressions are obtained relating these to the usual bulk properties, thus facilitating the calculation of the bulk properties from theoretical models and also providing a method of analysing experimental results obtainable from the direct measurement of internal strain. The theory can be applied both to the complete set of internal and external strains and to restricted sets appropriate to particular experimental conditions (eg those that preserve symmetry). By way of illustration, the theory is applied to the trigonal structure of selenium and tellurium, and a simple force constant model with this structure is used for the calculation of elastic stiffnesses for symmetry preserving strains. The limitations and advantages of the present theory are discussed and contrasted with those of methods previously used in treating internal strain.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
