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000172683 1001_ $$0P:(DE-HGF)0$$aBessas, D.$$b0$$eCorresponding Author
000172683 245__ $$aLattice dynamics in intermetallic Mg 2 Ge and Mg 2 Si424
000172683 260__ $$aBristol$$bIOP Publ.$$c2014
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000172683 520__ $$aThe lattice dynamics of polycrystalline Mg2Ge and Mg2Si are compared using both microscopic and macroscopic measurements as well as theoretical calculations. The volume thermal expansion coefficient between 200 and 300 K was found to be 4.37(5) centerdot 10−5 K−1 in Mg2Ge, compared to 3.69(5) centerdot 10−5 K−1 in Mg2Si. Inelastic neutron scattering measurements yield densities of phonon states which are in line with theoretical calculations. The microscopic data were corroborated with macroscopic calorimetry measurements and provide quantified values for anharmonicity. The estimated macroscopic Grüneisen parameter is, γMg2Si = 1.17(5) and γMg2Ge = 1.46(5) at 295 K, in excellent agreement with Raman scattering data. Although the element specific mean force constants are practically the same, in Mg2Ge and Mg2Si, a mass homology relation alone cannot reproduce the difference in the partial densities of vibrational states in these compounds and differences in elemental bonding should be taken into account.
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000172683 7001_ $$0P:(DE-HGF)0$$aSimon, R. E.$$b1
000172683 7001_ $$0P:(DE-Juel1)145694$$aFriese, K.$$b2$$ufzj
000172683 7001_ $$0P:(DE-HGF)0$$aKoza, M.$$b3
000172683 7001_ $$0P:(DE-HGF)0$$aHermann, R. P.$$b4
000172683 773__ $$0PERI:(DE-600)1472968-4$$a10.1088/0953-8984/26/48/485401$$gVol. 26, no. 48, p. 485401 -$$n48$$p485401 -$$tJournal of physics / Condensed matter$$v26$$x1361-648X$$y2014
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