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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Pan Y. M., Madyukov I. A., Smirnov M. B., Vtyurin A. N.
Заглавие : Raman investigation of hydrostatic and nonhydrostatic compressions of OH- and F-apophyllites up to 8 GPa
Место публикации : J. Raman Spectrosc.: WILEY-BLACKWELL, 2012. - Vol. 43, Is. 3. - P.439-447. - ISSN 0377-0486, DOI 10.1002/jrs.3049
Примечания : Cited References: 18. - This work was supported by the Siberian Division of RAS (Integration Project 109), the Russian Ministry of Science and Education and the CRDF (BRHE - REC-008 grant) and the Russian Foundation for Basic Research (RFBR-11-05-01121).
Предметные рубрики: RADIATION-INDUCED DEFECTS
ALPHA-QUARTZ
ROOM-TEMPERATURE
MEMORY GLASS
PRESSURE
FLUORAPOPHYLLITE
PHASE
MODEL
Ключевые слова (''Своб.индексиров.''): raman spectroscopy--high pressure--apophyllite--layer silicate--amorphization
Аннотация: Layer silicates F- and OH-apophyllites, KCa4Si8O20(F, OH)·8H2O, have been investigated by Raman spectroscopy at hydrostatic and nonhydrostatic pressures up to 8 GPa in diamond anvil cells using a 4 : 1 methanol–ethanol mix as pressure-transmitting medium. Our experiments show that at hydrostatic compression, apophyllites retain their crystalline states (i.e. no amorphization) up to 5 GPa. The wavenumbers of most bands exhibit linear dependences on pressure, except for a few ones, e.g. at 162 and 3565 cm–1 in OH-form (160.5 and 3558 cm–1 in F-form) that show nonlinear dependences. Nonhydrostatic compression with additional uniaxial loading induces amorphization of apophyllites. The majority of the bands in OH-apophyllite decreases markedly in intensity and shows considerable broadening under nonhydrostatic compression up to 3–6 GPa. In addition, the wavenumbers of several bands at nonhydrostatic compression exhibit considerable nonlinear dependences on pressure with strong hysteresis. These bands are mainly associated with vibrations of the interlayer ions and molecules and also of stretching and bending silicate sheets, hence being highly sensitive to the interlayer distance. Finally, we have calculated the lattice dynamics of F-apophyllite and interpreted the majority of bands, and these data are used to explain the complex baric behavior of the bands. Copyright © 2011 John Wiley & Sons, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Udod L. V., Sablina K. A., Ivanov Y. N.
Заглавие : NMR-study of the crystalline and amorphous CuB2O4
Разночтения заглавия :авие SCOPUS: NMR-study of the crystalline and amorphous CuB 2O 4
Место публикации : J. Supercond. Nov. Magn.: SPRINGER, 2007. - Vol. 20, Is. 2. - P183-186. - ISSN 1557-1939, DOI 10.1007/s10948-006-0122-6
Примечания : Cited References: 9
Предметные рубрики: COPPER METABORATE
BORATE GLASSES
Ключевые слова (''Своб.индексиров.''): amorphous states--copper metaborate--amorphization--amorphous materials--crystalline materials--ground state--magnetic properties--molecular structure--nuclear magnetic resonance spectroscopy--copper compounds
Аннотация: B-11 nuclear magnetic resonance (NMR) spectroscopy was applied to study the crystalline, amorphous and crystallizing from an amorphous states of copper metaborate. The occurrence of trigonal BO3 units at the expense of converting tetragonal BO4 units was observed in amorphous CuB2O4. This fact explains the essential change of CuB2O4 magnetic properties under amorphization.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Yushina, Irina, Slyusareva, Evgenia, Krylova S. N., Vtyurin A. N., Kaskel, Stefan, Senkovska, Irena
Заглавие : Structural phase transitions in flexible DUT-8(Ni) under high hydrostatic pressure
Коллективы : RFBR (Russian Foundation for Basic Research)Russian Foundation for Basic Research (RFBR) [21-52-12018]; DFG (Deutsche Forschungsgemeinschaft)German Research Foundation (DFG) [448809307]
Место публикации : Phys. Chem. Chem. Phys. - 2022. - Vol. 24, Is. 6. - P.3788-3798. - ISSN 1463-9076, DOI 10.1039/d1cp05021d. - ISSN 1463-9084(eISSN)
Примечания : Cited References: 57. - This work was financially supported by the RFBR (Russian Foundation for Basic Research, project number: 21-52-12018) and DFG (Deutsche Forschungsgemeinschaft, project number: 448809307). The Raman and high hydrostatic pressure experiments were performed in the Center for Common Use of the Krasnoyarsk Scientific Center SB RAS. The authors thank M. Maliuta for sample synthesis and characterisation
Предметные рубрики: METAL-ORGANIC FRAMEWORK
RAMAN-SPECTROSCOPY
PORE-SIZE
AMORPHIZATION
Аннотация: The behaviours of the open pore (op) and closed pore (cp) phases of the flexible Ni2(ndc)2(dabco) (ndc – 2,6-naphthalene dicarboxylate, dabco – 1,4-diazabicyclo[2.2.2]octane, DUT-8(Ni)) metal–organic framework under high hydrostatic pressures up to 10 GPa in isopropanol and silicone oil were studied by Raman spectroscopy. Ab initio simulations of vibrational spectra were performed for the open and closed pore phases, which allowed us to disclose the characteristic vibrational modes affected by the structural transitions under pressure. Analysis of theoretical and experimental Raman data suggests that the op–cp transition involves gateway vibrations at 25 and 67 cm−1, corresponding to trampoline/rotational motions of aromatic linkers. The experiments reveal the formation of new distorted cp phases at pressures higher than 2 GPa, which are formed without amorphisation. The transition between the cp phase and the distorted cp phase is reversible. The experiments also reveal the pivotal role of the pressure transmitting medium on the phase transition behaviour.
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