About: Lattice dynamics of Sb2Te3 at high pressures

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Description	We report an experimental and theoretical lattice dynamics study of antimony telluride (Sb2Te3) up to 26 GPa together with a theoretical study of its structural stability under pressure. Raman-active modes of the low-pressure rhombohedral (R-3m) phase were observed up to 7.7 GPa. Changes of the frequencies and linewidths were observed around 3.5 GPa where an electronic topological transition was previously found. Raman-mode changes evidence phase transitions at 7.7, 14.5, and 25 GPa. The frequencies and pressure coefficients of the new phases above 7.7 and 14.5 GPa agree with those calculated for the monoclinic C2/m and C2/c structures recently observed at high pressures in Bi2Te3 and also for the C2/m phase in the case of Bi2Se3 and Sb2Te3. Above 25 GPa no Raman-active modes are observed in Sb2Te3, similarly to the case of Bi2Te3 and Bi2Se3. Therefore, it is possible that the structure of Sb2Te3 above 25 GPa is the same disordered bcc phase already found in Bi2Te3 by x-ray diffraction studies. Upon pressure release, Sb2Te3 reverts back to the original rhombohedral phase after considerable hysteresis. Raman- and IR-mode symmetries, frequencies, and pressure coefficients in the different phases are reported and discussed. We report an experimental and theoretical lattice dynamics study of antimony telluride (Sb2Te3) up to 26 GPa together with a theoretical study of its structural stability under pressure. Raman-active modes of the low-pressure rhombohedral (R-3m) phase were observed up to 7.7 GPa. Changes of the frequencies and linewidths were observed around 3.5 GPa where an electronic topological transition was previously found. Raman-mode changes evidence phase transitions at 7.7, 14.5, and 25 GPa. The frequencies and pressure coefficients of the new phases above 7.7 and 14.5 GPa agree with those calculated for the monoclinic C2/m and C2/c structures recently observed at high pressures in Bi2Te3 and also for the C2/m phase in the case of Bi2Se3 and Sb2Te3. Above 25 GPa no Raman-active modes are observed in Sb2Te3, similarly to the case of Bi2Te3 and Bi2Se3. Therefore, it is possible that the structure of Sb2Te3 above 25 GPa is the same disordered bcc phase already found in Bi2Te3 by x-ray diffraction studies. Upon pressure release, Sb2Te3 reverts back to the original rhombohedral phase after considerable hysteresis. Raman- and IR-mode symmetries, frequencies, and pressure coefficients in the different phases are reported and discussed. (en)
Title	Lattice dynamics of Sb2Te3 at high pressures Lattice dynamics of Sb2Te3 at high pressures (en)
skos:prefLabel	Lattice dynamics of Sb2Te3 at high pressures Lattice dynamics of Sb2Te3 at high pressures (en)
skos:notation	RIV/00216275:25310/11:39895555!RIV13-MSM-25310___
http://linked.open...avai/predkladatel	Fakulta chemicko-technologická
http://linked.open...avai/riv/aktivita	I
http://linked.open...avai/riv/aktivity	I
http://linked.open...iv/cisloPeriodika	17
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Kucek, Vladimír Drašar, Čestmír
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Pardubice / Fakulta chemicko-technologická
http://linked.open...dnocenehoVysledku	209052
http://linked.open...ai/riv/idVysledku	RIV/00216275:25310/11:39895555
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	order-disorder transitions; melting; localized modes; Sb2Te3; lattice dynamics; High-pressure efects (en)
http://linked.open.../riv/klicoveSlovo	lattice dynamics High-pressure efects Sb2Te3 localized modes order-disorder transitions melting
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[5385DFC7EFD2]
http://linked.open...i/riv/nazevZdroje	Physical Review B
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	84
http://linked.open...iv/tvurceVysledku	Drašar, Čestmír Gomis, O. Kucek, Vladimír Munoz, A. Vilaplana, R. Manjon, F. J. Perez-Gonzales, E. Rodrigues-Hernandez, P.
http://linked.open...ain/vavai/riv/wos	000297413700002
issn	1098-0121
number of pages	12 (xsd:int)
http://bibframe.org/vocab/doi	10.1103/PhysRevB.84.174305
http://localhost/t...ganizacniJednotka	25310
is http://linked.open...avai/riv/vysledek of	Lattice dynamics of Sb2Te3 at high pressures

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