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000173154 1001_ $$0P:(DE-Juel1)144500$$aKlobes, B.$$b0$$eCorresponding Author$$ufzj
000173154 245__ $$aEffect of nanocrystallinity on lattice dynamics in Bi $_{2}$ Te $_{3}$ based thermoelectrics
000173154 260__ $$aWeinheim$$bWiley-VCH$$c2015
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000173154 520__ $$aThe lattice dynamics in as-cast and nanocrystalline thermoelectric Bi2Te3 based p-type and n-type material were investigated using inelastic neutron scattering. Generalized densities of phonon states show substantial agreement between the lattice dynamics in as-cast samples and previous studies. The lattice dynamics in the nanocrystalline materials differ significantly from its as-cast counterparts in the acoustic phonon regime. In nanocrystalline p-type and n-type compounds, the average acoustic phonon group velocity was found to be reduced to 80(5)% and 95(2)% of the value in as-cast material. It is argued that point-defect and strain contrast scattering may play an important role for the understanding of lattice thermal conductivity in (nanocrystalline) Bi2Te3 based thermoelectrics beside the observed decrease of sound velocity
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000173154 7001_ $$0P:(DE-HGF)0$$aBessas, D.$$b1
000173154 7001_ $$0P:(DE-HGF)0$$aJuranyi, F.$$b2
000173154 7001_ $$0P:(DE-HGF)0$$aGörlitz, H.$$b3
000173154 7001_ $$0P:(DE-HGF)0$$aPacheco, V.$$b4
000173154 7001_ $$0P:(DE-Juel1)130706$$aHermann, Raphael$$b5$$ufzj
000173154 773__ $$0PERI:(DE-600)2259465-6$$a10.1002/pssr.201409479$$gVol. 9999, no. 9999, p. n/a - n/a$$n1$$p57–61$$tPhysica status solidi / Rapid research letters$$v9$$x1862-6254$$y2015
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