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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 сборника (однотомник)
Шифр издания :
Автор(ы) : Sorokin B. P., Glushkov D. A., Turchin P. P., Michailyuta S. V., Aleksandrov K. S., Doubovsky A. B.
Заглавие : Elastic anharmonicity and elastic constants temperature dependences of different quality quartz crystals
Коллективы : IEEE Annual frequency control symposium
Место публикации : Proc Annu IEEE Int Freq Control Symp. - 2000. - P.410-415. - ISBN 0161-6404
Ключевые слова (''Своб.индексиров.''): acoustic bulk wave devices--acoustic wave propagation--elastic moduli--pressure effects--quartz--thermal effects--crystal quality--elastic anharmonicity--mechanical pressure--second order elastic constant--temperature coefficients--crystal structure
Аннотация: SOEC temperature dependences of different quality quartz crystals were studied. The simplified phenomenological theory was applied to calculate second order elastic constant temperature dependences. The bulk acoustic waves propagation under the bias of temperature field or of the uniaxial mechanical pressure was considered. It was found that crystal quality changes have caused certain variations of some third order elastic constant values and some temperature coefficients.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Sorokin B. P., Turchin P. P., Burkov S. I., Glushkov D. A., Karpovich A. A.
Заглавие : Effects of static electric field and of mechanical pressure on surface acoustic waves propagation in La3Ga5SiO14 piezoelectric single crystals
Коллективы : IEEE International Ultrasonics Symposium
Место публикации : Proc IEEE Ultrason Symp. - 1995. - Vol. 1. - P.409-412. - ISBN 1051-0117
Ключевые слова (''Своб.индексиров.''): electric field effects--electrostriction--lanthanum compounds--piezoelectric materials--piezoelectricity--pressure effects--quartz--single crystals--tensors--bulk acoustic wave--dielectric permeability--electromechanical bond coefficients--lanthanum gallium silicide--mechanical pressure--nonlinear electromechanical properties--nonlinear piezoelectric effect--piezoquartz--static electric field--tensorial components--ultrasonic propagation
Аннотация: The complete set of tensorial components of linear and nonlinear electromechanical properties for La3Ga5SiO14 piezoelectric crystals have been obtained. These data were used for the analysis of influence of static electrical field and of uniaxial homogeneous mechanical pressure on the propagation of surface acoustic waves.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang, Naizheng, Jiang, Xingxing, Molokeev M. S., Song, Gaomin, Guo, Shibin, Huang, Rongjin, Li, Laifeng, Wu, Yicheng, Lin, Zheshuai
Заглавие : Linear Zero Thermal Expansion in a Deep-Ultraviolet Transparent Crystal of BPO4 with Cristobalite-like Structure
Коллективы : National Scientific Foundations of China [51872297, 51702330, 51802321, 51890864]; Fujian Institute of Innovation [FJCXY18010201]; Youth Innovation Promotion Association in CAS [2017035]
Место публикации : Cryst. Growth Des. - 2019. - Vol. 19, Is. 6. - P.3109-3112. - ISSN 1528-7483, DOI 10.1021/acs.cgd.9b00361. - ISSN 1528-7505(eISSN)
Примечания : Cited References: 32. - This work was supported by the National Scientific Foundations of China (Grants 51872297, 51702330, 51802321 and 51890864) and Fujian Institute of Innovation (FJCXY18010201) in CAS, and the Youth Innovation Promotion Association in CAS (outstanding member for Z.L. and Grant 2017035 for X.J.).
Предметные рубрики: PHASE-TRANSITION
DIFFRACTION
QUARTZ
Аннотация: We report the discovery of the zero thermal expansion (ZTE) effect in BPO4, a famous deep-ultraviolet (DUV) optical material with cristobalite-like structure. It is revealed that BPO4 has a linear ZTE coefficient of -0.16(5) MK-1 along the c-axis as temperature increases from 13 to 300 K, which originates from the subtle counterbalance between the rotation-induced expansion and contraction effects among BO4 and PO4 groups. BPO4 is a unique DUV cristobalite-like material exhibiting the linear ZTE behavior.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krinitsyn D. O., Romanchenko A. S., Vorob'ev S. A., Likhatskii M. N., Karacharov A. A., Krylov A. S., Volochaev M. N., Mikhlin, Yu L.
Заглавие : Synthesizing zinc sulfide films on the gold surface as the sensor for electrochemical quartz crystal microbalance
Коллективы : Russian Scientific FoundationRussian Science Foundation (RSF) [18-17-00135]
Место публикации : Russ. J. Electrochem. - 2021. - Vol. 57, Is. 12. - P.1157-1163. - ISSN 1023-1935, DOI 10.1134/S1023193521120041. - ISSN 1608-3342(eISSN)
Примечания : Cited References: 23. - The study was supported by the Russian Scientific Foundation (grant no. 18-17-00135)
Предметные рубрики: CHEMICAL BATH DEPOSITION
ZNS
SPHALERITE
ELECTRODES
ACTIVATION
Аннотация: A zinc sulfate film is deposited from aqueous solutions of zinc sulfate onto the gold surface with the aim of preparation of a sensor for electrochemical quartz crystal microbalance (EQCM). The kinetics of this process, the particles formed in solution, and the film itself are studied by the methods of electrochemical quartz crystal microbalance, X-ray photoelectron spectroscopy, transmission electron microscopy, atomic force microscopy, optical and Raman spectroscopies, and dynamic light scattering. The effect of the procedure of gold surface preparation, the reagent concentration, and the temperature on the film adhesion, the length of induction period, the kinetics of film growth, and its structure and thickness are studied. It is shown that the film formation proceeds as a result of deposition of sufficiently coarse 200-700 nm colloid particles of sphalerite. It is demonstrated that this sensor can be used in studying the electrochemical reactions of ZnS and the interface phenomena by the methods of EQCM and cyclic voltammetry.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Savitskaya N. E., Popkov S. I., Kuzmichev N. D., Vasyutin M. A., Balaev D. A.
Заглавие : Anisotropic magnetization of an NbN film
Место публикации : J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P.707-712. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776122060097
Примечания : Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”)
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.
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