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    Understanding perceived color through gradual spectroscopic variations in electrochromism / S. Mishra [et al.] // Indian J. Phys. - 2019. - Vol. 93, Is. 7. - P. 927-933, DOI 10.1007/s12648-018-1353-7. - Cited References: 34. - Authors acknowledge financial support from the Department of Science and Technology (DST), Govt. of India. Authors are thankful to Dr. K. V. Adarsh (IISER Bhopal) for Raman measurements. Authors thank Prof. V.D. Vankar (IIT Delhi) for useful discussions. Authors (AC and DKP) are thankful to MHRD and CSIR (Govt. of India), respectively, for providing fellowships. Support received from DST under FIST scheme (grant number: SR/FST/PSI-225/2016) is also acknowledged. . - ISSN 0973-1458. - ISSN 0974-9845
   Перевод заглавия: Понимание воспринимаемого цвета через постепенные спектроскопические изменения в электрохромизме

РУБ Physics, Multidisciplinary
Рубрики:
3 REDOX FORMS
   TUNGSTEN-OXIDE
   RAMAN-SPECTRA
   VIOLOGEN
   SALTS
Кл.слова (ненормированные):
Viologen -- Raman spectroscopy -- Electrochromism -- UV-Vis
Аннотация: A bias-dependent in situ Raman scattering and UV–Vis absorption spectroscopic change has been correlated with the corresponding color change of an electrochromic device in an attempt to explain how to understand the relationship between actual perceived color and its absorption/transmittance spectra. For this, the bias across an electrochromic device was increased gradually, rather than abruptly turning ON and OFF, to see subtle variations in Raman and absorption spectra due to bias. Raman scattering establishes that viologen changes its oxidation state reversibly between two redox species (EV2+ to EV+•) as a result of bias-induced dynamic redox process. A gradual variation in Raman and absorption spectra, which shows maximum absorption corresponding to the yellow light, accompanies similar variation in color change of the device as visible by naked eye. These spectroscopic results are correlated with the perceived blue color, in the reflected light, by the eye to understand the actual reason behind this. Maximum absorption of yellow light by the device resulting in blue appearance has been explained using the concept of additive and subtractive primary colors.

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Держатели документа:
Indian Inst Technol Indore, Discipline Phys & MEMS, Mat Res Lab, Simrol 453552, India.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Alberta, Natl Inst Nanotechnol, Edmonton, AB, Canada.

Доп.точки доступа:
Mishra, S.; Yogi, P.; Chaudhary, A.; Pathak, D. K.; Saxena, S. K.; Krylov, A. S.; Крылов, Александр Сергеевич; Sagdeo, P. R.; Kumar, R.; Department of Science and Technology (DST), Govt. of India; MHRD; CSIR (Govt. of India); DST under FIST scheme [SR/FST/PSI-225/2016]
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Dynamical immiscibility of aqueous carbonate fluid in the shortite-water system at high-pressure-temperature conditions / S. V. Goryainov, S. N. Krylova, U. O. Borodina, A. S. Krylov // J. Phys. Chem. C. - 2021. - Vol. 125, Is. 33. - P. 18501-18509, DOI 10.1021/acs.jpcc.1c05077. - Cited References: 47. - The reported study was funded by the RFBR and DFG, project number 21-52-12018. Work is done on the state assignment of the Sobolev Institute of Geology and Mineralogy, Kirensky Institute of Physics SB RAS, Equipment of Federal Research Center of Krasnoyarsk Science Center SB RAS, and supported by the Ministry of Science and Higher Education. Authors thank A.N. Vtyurin, A.G. Sokol, A.Yu. Likhacheva, and A.F. Shatskiy for fruitful discussion . - ISSN 1932-7447. - ISSN 1932-7455

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
SIMULTANEOUSLY HIGH-PRESSURE
SODIUM FORMATE
RAMAN-SPECTRA
Аннотация: Anhydrous carbonate shortite, Na2Ca2(CO3)3, compressed in water at high pressure–temperature (up to 5 GPa, 350 °C) was studied by Raman spectroscopy. At 3.2 GPa and 250 °C, shortite begins to dissolve, followed by crystallization of aragonite and aragonite’. The unusual behavior of aqueous carbonate fluid was observed at 4.8 GPa and 300–350 °C. This process is characterized by the active formation of microbubbles within 2–60 s that are inserted one into another. Microbubbles are considered to be a result of the two immiscible fluid stratification. This dynamical immiscibility of the fluid accompanies the appearance of several crystalline carbonates and organic molecular crystals. Na-formate and some polymorphs of Ca-formate were observed.

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Держатели документа:
Sobolev Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Goryainov, Sergey, V; Krylova, S. N.; Крылова, Светлана Николаевна; Borodina, Ulyana O.; Krylov, A. S.; Крылов, Александр Сергеевич; RFBRRussian Foundation for Basic Research (RFBR); DFGGerman Research Foundation (DFG)European Commission [21-52-12018]; Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
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Phase transitions and p–T phase diagram of the multiferroic TbFe3(BO3)4 crystal / A. Krylov, M. Pavlovskiy, Y. Kitaev [et al.] // J. Raman Spectrosc. - 2022. - Vol. 53, Is. 6. - P. 1179-1187, DOI 10.1002/jrs.6341. - Cited References: 48. - Russian Foundation for Basic Research; RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Grant/Award Number: 20-42-240009; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft), Grant/Award Numbers: 448809307, 21-52-12018 . - ISSN 0377-0486. - ISSN 1097-4555

РУБ Spectroscopy
Рубрики:
BILBAO CRYSTALLOGRAPHIC SERVER
RAMAN-SPECTRA
HIGH-TEMPERATURE
Кл.слова (ненормированные):
ab initio calculation -- ferroborate -- multiferroic -- phase transitions -- p-T phase diagram
Аннотация: The structural phase transitions in multiferroic TbFe3(BO3)4 with change hydrostatic pressures and temperatures have been studied by Raman spectroscopy and calculation within density functional theory. Lattice dynamics calculations in the TbFe3(BO3)4 crystal in the ��32 phase under various values of applied hydrostatic pressure (from 0 up to 5 GPa with 1 GPa step) were performed. The calculation performed in this work in a TbFe3(BO3)4 crystal showed that the applied pressure can increase the phase transition temperature. Raman spectra of the TbFe3(BO3)4 crystal have been investigated at simultaneously high temperature and high pressure (up to 5.14 GPa and 465 K). The appearance of a soft mode was observed with decreasing temperature at normal pressure. The manifestations of the interaction of the structural and magnetic order parameters in the range from 13 to 50 K were observed at normal pressure. With increasing pressure and a fixed temperature, recovery of the soft modes is also observed. The experimental p–T phase diagram of TbFe3(BO3)4 was established. An increase in pressure leads to an increase in the temperature of transition.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Siberian Fed Univ, Photon & Laser Technol, Krasnoyarsk, Russia.
Ioffe Inst, Politekhnicheskaya 26, St Petersburg, Russia.
Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan, Peoples R China.
Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan, Peoples R China.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Kitaev, Y.; Gudim, I. A.; Гудим, Ирина Анатольевна; Andryshin, N. D.; Андрюшин, Никита Дмитриевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Jiang, Qinghui; Krylova, S. N.; Крылова, Светлана Николаевна; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240009]; Russian Foundation for Basic Research and DFG (Deutsche Forschungsgemeinschaft)German Research Foundation (DFG) [448809307, 21-52-12018]
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