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Statements

Subject Item
n2:RIV%2F00216275%3A25310%2F11%3A39895555%21RIV13-MSM-25310___
rdf:type
n15:Vysledek skos:Concept
dcterms: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.
dcterms:title
Lattice dynamics of Sb2Te3 at high pressures Lattice dynamics of Sb2Te3 at high pressures
skos:prefLabel
Lattice dynamics of Sb2Te3 at high pressures Lattice dynamics of Sb2Te3 at high pressures
skos:notation
RIV/00216275:25310/11:39895555!RIV13-MSM-25310___
n15:predkladatel
n19:orjk%3A25310
n3:aktivita
n11:I
n3:aktivity
I
n3:cisloPeriodika
17
n3:dodaniDat
n13:2013
n3:domaciTvurceVysledku
n14:1102982 n14:8046352
n3:druhVysledku
n12:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n17:predkladatel
n3:idSjednocenehoVysledku
209052
n3:idVysledku
RIV/00216275:25310/11:39895555
n3:jazykVysledku
n6:eng
n3:klicovaSlova
order-disorder transitions; melting; localized modes; Sb2Te3; lattice dynamics; High-pressure efects
n3:klicoveSlovo
n10:melting n10:Sb2Te3 n10:lattice%20dynamics n10:High-pressure%20efects n10:order-disorder%20transitions n10:localized%20modes
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[5385DFC7EFD2]
n3:nazevZdroje
Physical Review B
n3:obor
n18:BM
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
8
n3:rokUplatneniVysledku
n13:2011
n3:svazekPeriodika
84
n3:tvurceVysledku
Perez-Gonzales, E. Gomis, O. Drašar, Čestmír Rodrigues-Hernandez, P. Munoz, A. Manjon, F. J. Vilaplana, R. Kucek, Vladimír
n3:wos
000297413700002
s:issn
1098-0121
s:numberOfPages
12
n9:doi
10.1103/PhysRevB.84.174305
n7:organizacniJednotka
25310