Heat capacity of ZnO: Isotope effects
- 9 March 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 73 (9), 094303
- https://doi.org/10.1103/physrevb.73.094303
Abstract
We have measured the heat capacity of zinc oxide for several single crystals with different isotopic compositions in the temperature range. We have performed first-principles calculations in order to analyze the dependence of the heat capacity on the isotope mass of the oxygen and zinc atoms. This dependence provides us relevant information to understand thermodynamic properties from a microscopic point of view, and to validate theoretical models of phonon dispersion relations and atomic displacements. The Zn mass affects mainly the acoustic phonons, thus leading to isotopic effects on the heat capacity mostly at low temperatures, whereas the O mass affects mainly the optic phonons, which become thermally active at higher temperatures. This behavior is reproduced quantitatively by the calculations, and is also in agreement with theoretical predictions reported for wurtzite GaN, an isostructural semiconductor.
Keywords
This publication has 15 references indexed in Scilit:
- Heat capacity of: Isotope effectsPhysical Review B, 2005
- Heat capacity of isotopically enriched 28Si, 29Si and 30Si in the temperature range 4K<T<100KSolid State Communications, 2005
- Measurements of the heat capacity of diamond with different isotopic compositionsSolid State Communications, 2005
- Pressure dependence of the lattice dynamics of ZnO: Anab initioapproachPhysical Review B, 2004
- Effect of isotopic mass on the photoluminescence spectra of zinc oxideSolid State Communications, 2003
- First-principles computation of material properties: the ABINIT software projectComputational Materials Science, 2002
- Heat capacity of germanium crystals with various isotopic compositionJournal of Physics: Condensed Matter, 2001
- Fabrication and Optoelectronic Properties of a Transparent ZnO Homostructural Light-Emitting DiodeJapanese Journal of Applied Physics, 2001
- Phonon self-energies in semiconductors: anharmonic and isotopic contributionsSolid State Communications, 2001
- Electronic band structure of isotopically pure germanium: Modulated transmission and reflectivity studyPhysical Review B, 1994