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- W2078265319 startingPage "035401" @default.
- W2078265319 abstract "The structural, vibrational and thermal properties of rocksalt ScN and YN are investigated by using a first-principles plane-wave approach. The results are discussed in comparison with the similarly calculated results for rocksalt MgO and zincblende AlN. The thermal expansivity (α(V)) computed within the quasi-harmonic approximation shows that there are significant anharmonic effects in ScN and YN, which are comparable to those in MgO. Since no experimental results are available for α(V) of either ScN or YN, the anharmonic effects are accounted for by a variant of the very recently introduced effective semiempirical ansatz (Phys. Rev. B 2009 79 104304) for calculating anharmonic free energy, which does not require any input from experiment. The validity of this very simple approach is demonstrated first by applying it to MgO. For the considered phase of AlN, the quasi-harmonic approximation is valid up to very high temperatures, and the thus obtained α(V) is in good agreement with experiment. The values of α(V) for semiconductor transition metal nitrides that crystallize in the rocksalt phase are higher than those for the zincblende phase of group-IIIB nitrides, and a major part of these differences is due to the crystal structure." @default.
- W2078265319 created "2016-06-24" @default.
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- W2078265319 date "2011-12-20" @default.
- W2078265319 modified "2023-09-23" @default.
- W2078265319 title "Vibrational and thermal properties of ScN and YN: quasi-harmonic approximation calculations and anharmonic effects" @default.
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- W2078265319 doi "https://doi.org/10.1088/0953-8984/24/3/035401" @default.
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