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Calculation of Debye temperature for crystalline structures - A case study on Ti, Zr, and Hf
KTH, Superseded Departments, Materials Science and Engineering.
2001 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 49, no 6, 947-961 p.Article in journal (Refereed) Published
Abstract [en]

The methods to calculate the Debye temperature from elastic moduli have been reviewed. The approximation approach due to Moruzzi e al was critically examined by considering experimental elastic constant data for all the cubic elements. It was found that many cubic elements are exceptions with regard to the assumed constant scaling factor for the expression of the average sound velocity in terms of the bulk modulus, and consequently the Debye temperature of a cubic element must be calculated from the knowledge of all the elastic constants of the system. On the other hand, a fairly constant scaling factor has been found to exist fur the hexagonal elements. Through the study of experimental data, some empirical relationships have been observed between the high temperature entropy-Debye temperature theta (D)(0) and the low temperature limit of the Debye temperature theta (D)(-3). For those structures that are dynamically unstable at low temperatures, we proposed a way to obtain their theta (D)(0) from the calculated isotropic bulk moduli. The methods have been applied to calculate the Debye temperatures of hcp, bcc, and fee Ti, Zr, and Hf from their elastic moduli derived from ah initio calculations. The calculated results agree very well with the experimental data.

Place, publisher, year, edition, pages
2001. Vol. 49, no 6, 947-961 p.
Keyword [en]
Debye temperature, elastic, ab initio calculation, thermodynamics, group-iv metals, generalized gradient approximation, total-energy calculations, cubic transition-metals, phonon-dispersion, elastic-constants, bcc phase, exchange, stability, zirconium
URN: urn:nbn:se:kth:diva-20520ISI: 000168027700002OAI: diva2:339215
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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