Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Pressure-Driven Chemical Disorder in Glassy As2S3 up to 14.7 GPa, Postdensification Effects, and Applications in Materials Design. / Soignard, Emmanuel; Tsiok, Oleg B.; Tverjanovich, Andrey S.; Bytchkov, Aleksei; Sokolov, Anton; Brazhkin, Vadim V.; Benmore, Chris J.; Bychkov, Eugene.
в: Journal of Physical Chemistry B, Том 124, № 2, 16.01.2020, стр. 430-442.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Pressure-Driven Chemical Disorder in Glassy As2S3 up to 14.7 GPa, Postdensification Effects, and Applications in Materials Design
AU - Soignard, Emmanuel
AU - Tsiok, Oleg B.
AU - Tverjanovich, Andrey S.
AU - Bytchkov, Aleksei
AU - Sokolov, Anton
AU - Brazhkin, Vadim V.
AU - Benmore, Chris J.
AU - Bychkov, Eugene
PY - 2020/1/16
Y1 - 2020/1/16
N2 - A small difference in energy between homopolar and heteropolar bonds and the glass-forming ability of pure chalcogens leads to unexpected trends in densification mechanisms of glassy chalcogenides compared to vitreous oxides. Using high-precision compressibility measurements and in situ high-energy X-ray diffraction up to 14.7 GPa, we show a new densification route in a canonical glass As2S3. After the first reversible elastic step with a maximum pressure of 1.3 GPa, characterized by a strong reduction of voids and cavities, a significant bonding or chemical disorder is developed under higher pressure, reaching a saturation of 30% in the population of As-As bonds above 8-9 GPa. The pressure-driven chemical disorder is accompanied by a remarkable structural relaxation and a strongly diminished optical gap and determines structural, vibrational, and optical properties under and after cold compression. The decompressed recovered glass conserves a dark color and exhibits two relaxation processes: (a) fast (a few days) and (b) slow (months/years at room temperature). The enhanced refractive index of the recovered glass is promising for optical applications with improved functionalities. A nearly permanent red shift in optical absorption after decompression can be used in high-impact-force optical sensors.
AB - A small difference in energy between homopolar and heteropolar bonds and the glass-forming ability of pure chalcogens leads to unexpected trends in densification mechanisms of glassy chalcogenides compared to vitreous oxides. Using high-precision compressibility measurements and in situ high-energy X-ray diffraction up to 14.7 GPa, we show a new densification route in a canonical glass As2S3. After the first reversible elastic step with a maximum pressure of 1.3 GPa, characterized by a strong reduction of voids and cavities, a significant bonding or chemical disorder is developed under higher pressure, reaching a saturation of 30% in the population of As-As bonds above 8-9 GPa. The pressure-driven chemical disorder is accompanied by a remarkable structural relaxation and a strongly diminished optical gap and determines structural, vibrational, and optical properties under and after cold compression. The decompressed recovered glass conserves a dark color and exhibits two relaxation processes: (a) fast (a few days) and (b) slow (months/years at room temperature). The enhanced refractive index of the recovered glass is promising for optical applications with improved functionalities. A nearly permanent red shift in optical absorption after decompression can be used in high-impact-force optical sensors.
UR - http://www.scopus.com/inward/record.url?scp=85077952954&partnerID=8YFLogxK
U2 - 10.1021/acs.jpcb.9b10465
DO - 10.1021/acs.jpcb.9b10465
M3 - Article
C2 - 31845807
AN - SCOPUS:85077952954
VL - 124
SP - 430
EP - 442
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
SN - 1520-6106
IS - 2
ER -
ID: 53679072