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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Zherebtsova L. I., Iskornev I. M., Kruglik A. I., Rozanov O. V., Flerov I. N.
Заглавие : Investigation of structural and physical properties of cesium-lithium double sulfate
Место публикации : Sov. Phys. Solid State. - 1980. - Vol. 22, Is. 12. - P.2150-2152. - ISSN 0584-5807; Phys. Solid State
Ключевые слова (''Своб.индексиров.''): lithium compounds--ferroelasticity--phase transitions--cesium compounds
Аннотация: A study was made of the temperature dependences of the integrated intensities of the 006 and 021 x-ray reflections, deviation of the angle gamma from 90 degree , NMR of **7Li, specific heat c//p, thermal expansion, and permittivity. Moreover, the effects of hydrostatic pressure on the phase transition were studied. It was definitely established that a ferroelastic phase transition of the second kind occurs at 202. 07 degree K and this transition does not alter the number of atoms in a unit cell.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Verin I. A., Aleksandrov K. S.
Заглавие : X-ray diffraction study of RbLiCrO4
Коллективы : European meeting on ferroelectricity
Место публикации : Ferroelectrics. - 1991. - Vol. 124, Is. 1. - P.91-96. - ISSN 0015-0193, DOI 10.1080/00150199108209420
Примечания : Cited References: 12
Предметные рубрики: LITHIUM POTASSIUM-SULFATE
THERMAL VIBRATIONS
CRYSTALS
PROGRAM
KLISO4
LIKSO4
Аннотация: Crystal structure of RbLiCrO4 was determined in G3 phase (sp. gr. P31c) at 293, 428, 493, 523 K and in G2 phase (sp. gr. P63) at 553, 583 K applying X-ray diffraction data. The investigated crystals exhibit ‘twinning by merohedry’. The analysis of intensities and influence of anomalous scattering on them allowed us to choose twin elements and atomic configurations of twin domains for all the investigated specimens.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Verin I. A., Aleksandrov K. S.
Заглавие : Structure and twinning of RbLiCrO4 crystals
Место публикации : Acta Crystallogr. B. - 1993. - Vol. 49. - P.19-28. - ISSN 0108-7681, DOI 10.1107/S0108768192006141
Примечания : Cited References: 14
Предметные рубрики: LITHIUM POTASSIUM-SULFATE
NEUTRON-DIFFRACTION
THERMAL VIBRATIONS
KLISO4
PROGRAM
LIKSO4
Аннотация: The crystal structures of the G3 (space group P31c) and G2 (space group P6(3)) phases of RbLiCrO4 have been determined from X-ray diffraction data (Mo Kalpha radiation) at 293, 428, 493 and 523 K (G3 phase) and 553 and 583 K (G2 phase). The RbLiCrO4 crystals exhibit twinning by merohedry with twin laws in the G3 phase: 2 parallel-to [001], m perpendicular-to [001], 1BAR; in the G2 phase: m parallel-to [001], 2 perpendicular-to [001], 1BAR. The analysis of diffraction intensities and influence of anomalous scattering on them provided the unambiguous determination of the twin laws for all the specimens investigated. The structure has been refined using the approximation of the anharmonic thermal vibrations of atoms.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Grankina V. A., Kartashev A. V.
Заглавие : A study of the effect of gradual substitution NH4 - Cs on phase transitions in NH4LiSO4 crystals
Разночтения заглавия :авие SCOPUS: A study of the effect of gradual substitution NH4 Cs on phase transitions in NH4LiSO4 crystals
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 2. - P379-385. - ISSN 1063-7834, DOI 10.1134/1.1451032
Примечания : Cited References: 22
Предметные рубрики: MIXED-CRYSTALS
TEMPERATURE PHASE
LINH4SO4
BIREFRINGENCE
SULFATE
RAMAN
Аннотация: Solid solutions in the Cs-x(NH4)(1 - x)LiSO4 (0 less than or equal to x less than or equal to 0.35) system are grown and investigated. The birefringence (n(a) - n(b)) and the heat capacity are measured in the temperature range 100-530 K. The (x-T) phase diagram is constructed. It is demonstrated that the substitution of cesium for ammonium in the NH4LiSO4 crystal affects the transition temperatures in such a way that the region of the ferroelectric phase increases and the ferroelastic phase disappears at x 0.22. The character of the high-temperature transition remains unchanged (2beta = 0.24 +/- 0.01 for all compositions), but the birefringence anomaly and enthalpy decrease. As the concentration x increases, the low-temperature transition becomes more similar to a first-order transition: the birefringence jump deltan and the temperature hysteresis DeltaT increase. (C) 2002 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Kartashev A. V., Grankina V. A., Flerov I. N.
Заглавие : Investigation of the reconstructive phase transition between metastable (alpha) and stable (beta) modifications of the NH4LiSO4 crystal
Разночтения заглавия :авие SCOPUS: Investigation of the Reconstructive Phase Transition between Metastable (α) and Stable (β) Modifications of the NH4LiSO 4 Crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 8. - P1572-1578. - ISSN 1063-7834, DOI 10.1134/1.1602898
Примечания : Cited References: 13
Предметные рубрики: AMMONIUM LITHIUM-SULFATE
LINH4SO4
TEMPERATURE
Аннотация: Crystals of ammonium lithium sulfate NH4LiSO4 in alpha and beta modifications are studied, and conditions of their nucleation and growth are determined. The alpha modification of NH4LiSO4 and alpha--beta phase transitions are investigated using polarized light microscopy, x-ray diffraction, and differential scanning calorimetry in the temperature range 80-530 K. It is found that, depending on the conditions of growth and storage, there exist two temperature ranges (T(alpha--beta)approximate to340-350 and approximate to440-450 K) in which the crystals can undergo an alpha--beta reconstructive phase transition. The enthalpy of this transformation depends on the symmetry of the final phase. In the former case (340-350 K), the reconstructive phase transition leads to rapid destruction of the sample. In the latter case (440-450 K), the crystal structure undergoes a slow transformation (recrystallization) without noticeable distortions. The results obtained indicate that no structural phase transition occurs in the alpha modification of NH4LiSO4 at 250 K. (C) 2003 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanov Y. N., Sukhovskii A. A., Aleksandrova I. P., Totz J., Michel D.
Заглавие : Nuclear spin resonance study of the ion mobility in a KHSeO4 crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 10. - P1845-1850. - ISSN 1063-7834, DOI 10.1134/1.1809417
Примечания : Cited References: 15
Предметные рубрики: POTASSIUM HYDROGEN SULFATE
EXCHANGE NMR
SOLIDS
Аннотация: The ion mobility in a crystal of partially deuterated potassium hydroselenate (KHSe) was studied using nuclear spin resonance (NSR) of H-1, H-2, Se-77, and K-39 in a wide temperature range. The temperature dependences of the deuterium NSR spectra above 360 K exhibit changes in the line shape characteristic of chemical exchange processes. These exchange processes were studied in detail using two-dimensional H-2 NSR spectroscopy. It was ascertained that the exchange between deuterons of hydrogen bonds take place in the entire temperature range under study. However, the measured conductivity was approximately one-hundredfold lower than that estimated from the exchange frequencies. It was assumed that the low conductivity in the temperature range under study is caused by closed dimers of SeO4 groups in the KHSe structure. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Grankina V. A.
Заглавие : Optical investigations of the effect of gradual substitution NH4 - Cs on the ferroelastic phase transition in a CsLiSO4 crystal
Разночтения заглавия :авие SCOPUS: Optical Investigations of the Effect of Gradual Substitution NH4 Cs on the Ferroelastic Phase Transition in a CsLiSO4 Crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 3. - P515-520. - ISSN 1063-7834, DOI 10.1134/1.1687871
Примечания : Cited References: 14
Предметные рубрики: AMMONIUM LITHIUM-SULFATE
TEMPERATURE PHASE
NH4LISO4
Аннотация: Crystals of Cs-x(NH4)(1 - x)LiSO4 (0.39 less than or equal to x less than or equal to 1.0) solid solutions are grown and investigated using polarized light microscopy and measurements of the birefringence in the temperature range 100-530 K. The (x-T) phase diagram of the Cs-x(NH4)(1 - x)LiSO4 solid solutions is constructed. It is demonstrated that, upon substitution of ammonium for cesium in the CsLiSO4 crystal, the phase transition temperature gradually increases to such a degree that the ferroelastic phase can exist at room temperature. The triple point of intersection of the Pmcn, P2(1)cn, and P112(1)/n phase boundaries is determined. It is established that the introduction of ammonium in small amounts has an unusually strong effect on the refractive properties and character of the ferroelastic phase transition in the CsLiSO4 crystal. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Kartashev A. V., Grankina V. A.
Заглавие : Heat capacity and phase transitions in NH4LiSO4, Cs-x(NH4)(1-x) LiSO4, and RbLiSO4
Разночтения заглавия :авие SCOPUS: Heat capacity and phase transitions in NH4LiSO4, Csx(NH4)1-xLiSO4, and RbLiSO 4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 4. - P720-728. - ISSN 1063-7834, DOI 10.1134/1.1913987
Примечания : Cited References: 29
Предметные рубрики: ROOM-TEMPERATURE
MONTE-CARLO
LINH4SO4
SUBSTITUTION
CRYSTALS
SULFATE
CSLISO4
Аннотация: The heat capacity of NH4LiSO4, RbLiSO4, and Cs-x(NH4)(1 - x) LiSO4 crystals and its behavior over a broad temperature range including the phase transition regions were studied. The entropy changes corresponding to structural transformations in these crystals were found not to be characteristic of straightforward ordering of structural blocks. The results obtained are discussed in terms of phenomenological theory and model concepts. (C) 2005 Pleiades Publishing, Inc.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bukhtiyarova G. A., Mart'yanov O. N., Yakushkin S. S., Shuvaeva M. A., Bayukov O. A.
Заглавие : State of iron in nanoparticles prepared by impregnation of silica gel and aluminum oxide with FeSO4 solutions
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 4. - P826-837. - ISSN 1063-7834, DOI 10.1134/S1063783410040268
Примечания : Cited References: 27. - This study was supported by the Presidium of the Russian Academy of Sciences within the framework of the Program no. 27 "Principles of Basic Research of Nanotechnologies and Nanomaterials," Project no. 46 "Magnetically Ordered Nanoparticles in Catalytic Systems: Synthesis, Evolution, and Physicochemical Properties."
Предметные рубрики: THERMAL-DECOMPOSITION
BETA-FEOOH
MOSSBAUER
FERRIHYDRITE
EPSILON-FE2O3
FE-2(SO4)(3)
SULFATE
FE-57
Аннотация: The state of iron in nanoparticles prepared by impregnating silica gel and aluminum oxide with iron(II) sulfate solutions has been investigated using Mossbauer spectroscopy. It has been revealed that the state of iron depends on the nature of the support. Iron(III) hydroxysulfate and iron(III) oxysulfate nanoparticles are formed on the surface of silica gel, and iron oxide nanoparticles are formed on the surface of aluminum oxide. An increase in the concentration of iron ions or in the size of iron-containing particles leads to hydration of the nanoparticle surface. The calcination of the samples results in the formation of E -Fe2O3 oxide in a strongly disordered or amorphous state in iron-containing particles on the surface of silica gel.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Gorev M. V., Flerov I. N.
Заглавие : Intensive electrocaloric effect in triglycine sulfate under nonequilibrium thermal conditions and periodic electric field
Коллективы : RFBR; Government of Krasnoyarsk Territory [16-42-240428 p_a]
Место публикации : Phys. Status Solidi B. - 2016. - Vol. 253, Is. 10. - P.2073-2078. - ISSN 0370-1972, DOI 10.1002/pssb.201600339. - ISSN 1521-3951(eISSN)
Примечания : Cited References:29. - The reported study was funded by RFBR and Government of Krasnoyarsk Territory according to the research project no. 16-42-240428 p_a.
Ключевые слова (''Своб.индексиров.''): electrocaloric effect--ferroelectrics--nonequilibrium processes--phase--transitions
Аннотация: We present the results of both direct measurements and modeling of the intensive electrocaloric effect ΔTAD in ferroelectric triglycine sulfate under nonequilibrium thermal conditions and periodically varying electric field. In the narrow region around the phase transition temperature TC, a visible difference was observed between the electrocaloric responses at applying ΔTON and removal ΔTOFF of the constant electric field: |ΔTON| |ΔTOFF| and |ΔTON| |ΔTOFF| at T TC and T TC, respectively. The variation of the frequency and profile of the periodic electric field at T TC allowed one to obtain the gradual decrease in the average temperature of the top of the sample compared to the bottom kept at the constant temperature. At low frequency electric field, qualitative agreement was found between the time dependences of the measured experimentally and calculated ΔT values. Experimental and modeling studies of electrocaloric effect ΔTAD in triglycine sulfate showed that the applying/removal of a periodic electric field to/from the bulk sample decreases the average value of the waiving temperature of the top Ttop compared to T ≃ const of the bottom. Both frequency and duty cycle of the electric field impulses strongly affect Ttop.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wang X., Li J. -G., Molokeev M. S., Zhu Q., Li X., Sun X.
Заглавие : Layered hydroxyl sulfate: Controlled crystallization, structure analysis, and green derivation of multi-color luminescent (La,RE)2O2SO4 and (La,RE)2O2S phosphors (RE = Pr, Sm, Eu, Tb, and Dy)
Место публикации : Chem. Eng. J.: Elsevier, 2016. - Vol. 302. - P.577-586. - ISSN 13858947 (ISSN), DOI 10.1016/j.cej.2016.05.089
Примечания : Cited References: 50. - This work is supported in part by the National Natural Science Foundation of China (Grants Nos. 51172038, 51302032, and U1302272), the Fundamental Research Fund for the Central Universities (Grant No. N140204002), Grants-in-Aid for Scientific Research (KAKENHI No. 26420686), and the Russian Foundation for Basic Research (15-52-53080). X.J. Wang acknowledges financial support from the China Scholarship Council for her overseas Ph.D. study (Contract No. 201406080035) and the assistance of Q. Q. Zhu (University of Science and Technology of China) for his help with calcination.
Предметные рубрики: PHOTOLUMINESCENCE PROPERTIES
OXYSULFATE/OXYSULFIDE SYSTEMS
CRYSTAL-STRUCTURE
OXYGEN-STORAGE
Ln
NANOCOMPOSITES
EMISSION
CAPACITY
FAMILY
FABRICATION
Ключевые слова (''Своб.индексиров.''): sulfate type layered rare earth hydroxide--luminescence--oxysulfate--oxysulfide
Аннотация: The two important groups of Ln2O2SO4 and Ln2O2S compounds are traditionally synthesized with the involvements of environmentally harmful sulfur-containing reagents. We developed in this work a unique green approach for their synthesis, using Ln2(OH)4SO4·2H2O layered hydroxyl sulfate as the precursor (Ln-241 phase). Phase selective crystallization of La-241 under both atmospheric pressure and hydrothermal conditions was firstly optimized, followed by transformation into La2O2S and La2O2SO4 by controlled calcination. Rietveld structure refinement was performed for La-241, La(OH)SO4, La2O2SO4, and La2O2S, and the crystal structure and cell parameters of La-241 were originally reported. The photoluminescence performances of several important activators (Pr3+, Sm3+, Eu3+, Tb3+, and Dy3+) in the two hosts, in terms of excitation, emission, quantum yield, and color coordinates of emission, were thoroughly investigated, and multi-color luminescence including bright red, green, orange red, and yellow was obtained under ultraviolet excitation. Detailed investigations of Tb3+ photoluminescence revealed that the lack of 5D3 emission in La2O2S and the gradual quenching of 5D3 blue emission at a higher Tb3+ content (hence decreasing I488/I545 ratio and changing color coordinates) in La2O2SO4 were suggested to be due to thermal activation of the 5D3 electrons into the conduction band and cross relaxation between adjacent Tb3+, respectively. The synthesis approach developed in this work for La2O2SO4 and La2O2S, with water vapor as the only exhaust gas, is environmentally benign and holds great potential in the facile synthesis of analogous compounds of other lanthanides. © 2016 Elsevier B.V.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of a restricted geometry on thermal and dielectric properties of NH4HSO4 ferroelectric
Коллективы : Russia/CIS/Baltic/Japan Symposium on Ferroelectricity , Russian Foundation for Basic Research (RFBR) [16-32-00092 mol_a]
Место публикации : Ferroelectrics. - 2017. - Vol. 513, Is. 1. - P.44-50. - ISSN 0015-0193, DOI 10.1080/00150193.2017.1350436. - ISSN 1563-5112(eISSN)
Примечания : Cited References:17. - The reported study was partially supported by the Russian Foundation for Basic Research (RFBR), research project No. 16-32-00092 mol_a.
Предметные рубрики: PHASE-TRANSITIONS
AMMONIUM
CAPACITY
SULFATE
KH2PO4
Ключевые слова (''Своб.индексиров.''): ferroelectric--phase transition--porous glass--nanocomposite
Аннотация: Heat capacity, thermal dilatation, sensitivity to pressure and permittivity of NH4HSO4 embedded into glass matrices with a pore size of 320 nm and 46 nm were studied. Large difference in the thermal expansion of both glass and ferroelectric leads to a "clamped" state of NH4HSO4 in nanocomposites and to the phase transition temperatures change. The restricted geometry does not effect on the order of successive transformations in NH4HSO4 but is accompanied by a significant reduction in entropy of phase transitions. The behavior of DTA-signal and permittivity show the expansion of the temperature range of the ferroelectric phase under hydrostatic pressure.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarev V. S., Mikhaleva E. A., Flerov I. N., Gorev M. V.
Заглавие : Electrocaloric effect in triglycine sulfate under equilibrium and nonequilibrium thermodynamic conditions
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-42-240428r_a]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 6. - P.1118-1126. - ISSN 1063-7834, DOI 10.1134/S1063783417060051. - ISSN 1090-6460(eISSN)
Примечания : Cited References:25. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research, project no. 16-42-240428r_a.
Предметные рубрики: PERIODIC ELECTRIC-FIELD
Аннотация: The direct and indirect measurements of intensive electrocaloric effect in a triglycine sulfate ferroelectric crystal are performed under equilibrium and nonequilibrium thermodynamic conditions implemented in the adiabatic calorimeter. The effect of the electric field parameters (frequency, profile, and strength) on the value of the effect and degree of its reversibility are studied. The difference between the temperature variation values in a switched-on and switched-off dc field under quasi-isothermal conditions is established. The low-frequency periodic electric field induces the temperature gradient along the electrocaloric element and heat flux from its free end to the thermostated base. A significant excess of the field switching-off rate over the switching-on rate leads to a noticeable intensification of the cooling effect.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Aleksandrovsky A. S., Atuchin V. V., Krylov A. S., Molokeev M. S., Oreshonkov A. S., Shestakov N. P., Andreev O. V.
Заглавие : Exploration of structural, thermal and spectroscopic properties of self-activated sulfate Eu2(SO4)3 with isolated SO4 groups
Место публикации : J. Ind. Eng. Chem. - 2018. - Vol. 68. - P.109-116. - ISSN 1226086X (ISSN), DOI 10.1016/j.jiec.2018.07.034
Примечания : Cited References: 83. - This work was supported by the Russian Foundation for Basic Research ( 16-52-48010 , 17-52-53031 ). The equipments of the Collective Use Center — Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences [ http://ccu.kirensky.ru/ ] was used.
Ключевые слова (''Своб.индексиров.''): europium sulfate--synthesis--structure--thermal analysis--photoluminescence
Аннотация: Eu2(SO4)3 was synthesized by chemical precipitation method and the crystal structure was determined by Rietveld analysis. The compound crystallizes in monoclinic space group С2/с. In the air environment, Eu2(SO4)3 is stable up to 670 °C. The sample of Eu2(SO4)3 was examined by Raman, Fourier-transform infrared absorption and luminescence spectroscopy methods. The low site symmetry of SO4 tetrahedra results in the appearance of the IR inactive ν1 mode around 1000 cm−1 and ν2 modes below 500 cm−1. The band intensities redistribution in the luminescent spectra of Eu3+ ions is analyzed in terms of the peculiarities of its local environment.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Atuchin V. V., Molokeev M. S., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Volkova S. S., Andreev O. V.
Заглавие : Structure, thermal stability, and spectroscopic properties of triclinic Double sulfate AgEu(SO4)2 with isolated SO4 groups
Место публикации : Inorg. Chem. - 2018. - Vol. 57, Is. 21. - P.13279-13288. - ISSN 00201669 (ISSN), DOI 10.1021/acs.inorgchem.8b01837
Примечания : Cited References: 81. - This work was supported by the Russian Foundation for Basic Research (Grants 16-52-48010 and 17-52-53031). The equipment of the Collective Use Center, Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch Russian Academy of Sciences (http://ccu.kirensky.ru/) were used.
Аннотация: Silver–europium double sulfate AgEu(SO4)2 was obtained by solid-phase reaction between Ag2SO4 and Eu2(SO4)3. The crystal structure of AgEu(SO4)2 was determined by Monte Carlo method with simulated annealing, and after that, it was refined by the Rietveld method from X-ray powder diffraction data. The compound crystallizes in the triclinic symmetry, space group P1̅ (a = 0.632929(4), b = 0.690705(4), c = 0.705467(4) nm, α = 98.9614(4), β = 84.5501(4), γ = 88.8201(4)°, V = 0.303069(3) nm3). Two types of sulfate tetrahedra were found in the structure, which significantly affects the spectroscopic properties in the IR-range. In the temperature range of 143–703 K, the average linear thermal expansion coefficients of cell parameters a, b, and c are very similar, (1.11–1.67) × 10–5 K–1 in magnitude, and therefore, AgEu(SO4)2 expands almost isotropically. Upon heating in argon flow, AgEu(SO4)2 is stable up to 1053 K. The luminescence spectra in the region of ultranarrow 5D0–7F0 transition contain a single narrow and symmetric line at 579.5 nm that is evidence of good crystalline quality of AgEu(SO4)2 and uniform local environment of Eu3+ ions in the structure. Distribution of luminescence bands is determined by the environment of Eu3+ ions in the structure. Influence of Ag+ ions on the electron density distribution at Eu sites is detected.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Molokeev M. S., Bogdanov E. V., Bondarev V. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Effect of restricted geometry and external pressure on the phase transitions in ammonium hydrogen sulfate confined in a nanoporous glass matrix
Место публикации : J. Mater. Sci. - 2018. - Vol. 53, Is. 15. - P.12132–12144. - ISSN 00222461 (ISSN), DOI 10.1007/s10853-018-2467-1
Примечания : Cited References: 44. - The reported study was funded by Russian Foundation for Basic Research (RFBR) according to the Research Project No. 16-32-00092 mol_a.
Ключевые слова (''Своб.индексиров.''): hydraulics--hydrostatic pressure--permittivity--pore size--specific heat--sulfur compounds--thermal expansion
Аннотация: A study of heat capacity, thermal dilatation, susceptibility to hydrostatic pressure, permittivity and polarization loops was carried out on NH4HSO4–porous glass nanocomposites (AHS + PG) as well as empty glass matrices. The formation of dendrite clusters of AHS with a size, dcryst, exceeding the pore size was found. An insignificant anisotropy of thermal expansion of AHS + PG showing statistically uniform distribution of AHS with random orientations of nanocrystallites over the matrix was observed. The effect of internal and external pressures on thermal properties and permittivity was studied. At the phase transition P-1 ↔ Pc, a strongly nonlinear decrease in the entropy ΔS2 and volume strain (ΔV/V)T2 was observed with decreasing dcryst. The linear change in temperatures of both phase transitions P-1 ↔ Pc ↔ P21/c under hydrostatic pressure is accompanied by the expansion of the temperature range of existence of the ferroelectric phase Pc, while this interval narrows as dcryst decreases.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Molokeev M. S., Korotkov L. N., Rysiakiewicz-Pasek E.
Заглавие : Specific heat and thermal expansion of triglycine sulfate-porous glass nanocomposites
Коллективы : Russian Foundation for Basic Research [16-32-00092 mol-a]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 7. - P.1338-1343. - ISSN 1063-7834, DOI 10.1134/S1063783418070181. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research, project no. 16-32-00092 mol-a.
Предметные рубрики: PHASE-TRANSITIONS
DIELECTRIC-PROPERTIES
FERROELECTRIC COMPOSITES
Аннотация: The effect of restricted geometry on specific heat capacity and thermal expansion of the triglycine sulfate (TGS)–borosilicate glass composites have been studied first. A decrease in the entropy and temperature of the P21 ↔ P21/m phase transition in the TGS component with decreasing the glass matrix pore diameter at the invariable specific heat and thermal expansion coefficient has been observed. The estimates are indicative of the minor effect of internal pressure on the TGS pressure coefficient dTC/dp in the composites.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Molokeev M. S., Oreshonkov A. S., Krylov A. S., Aleksandrovsky A. S., Azarapin N. O., Andreev O. V., Razumkova I. A., Atuchin V. V.
Заглавие : Crystal structure, vibrational, spectroscopic and thermochemical properties of double sulfate crystalline hydrate [CsEu(H2O)3(SO4)2]·H2O and its thermal dehydration product CsEu(SO4)2
Место публикации : Crystals. - 2021. - Vol. 11, Is. 9. - Ст.1027. - ISSN 20734352 (ISSN), DOI 10.3390/cryst11091027
Примечания : Cited References: 103. - This work was partially supported by the Russian Foundation for Basic Research (grant 19-33-90258\19)
Аннотация: Crystalline hydrate of double cesium europium sulfate [CsEu(H2O)3(SO4)2]·H2O was synthesized by the crystallization from an aqueous solution containing equimolar amounts of 1Cs+:1Eu3+:2SO42− ions. Anhydrous salt CsEu(SO4)2 was formed as a result of the thermal dehydration of the crystallohydrate. The unusual effects observed during the thermal dehydration were attributed to the specific coordination of water molecules in the [CsEu(H2O)3(SO4)2]·H2O structure. The crystal structure of [CsEu(H2O)3(SO4)2]·H2O was determined by a single crystal X-ray diffraction analysis, and the crystal structure of CsEu(SO4)2 was obtained by the Rietveld method. [CsEu(H2O)3(SO4)2]·H2O crystallizes in the monoclinic system, space group P21/c (a = 6.5574(1) Å, b = 19.0733(3) Å, c = 8.8364(2) Å, β = 93.931(1)°, V = 1102.58(3) Å3). The anhydrous sulfate CsEu(SO4)2 formed as a result of the thermal destruction crystallizes in the monoclinic system, space group C2/c (a = 14.327(1) Å, b = 5.3838(4) Å, c = 9.5104(6) Å, β = 101.979(3) °, V = 717.58(9) Å3). The vibration properties of the compounds are fully consistent with the structural models and are mainly determined by the deformation of non-rigid structural elements, such as H2O and SO42−. As shown by the diffused reflection spectra measurements and DFT calculations, the structural transformation from [CsEu(H2O)3(SO4)2]·H2O to CsEu(SO4)2 induced a significant band gap reduction. A noticeable difference of the luminescence spectra between cesium europium sulfate and cesium europium sulfate hydrate is detected and explained by the variation of the extent of local symmetry violation at the crystallographic sites occupied by Eu3+ ions, namely, by the increase in inversion asymmetry in [CsEu(H2O)3(SO4)2]·H2O and the increase in mirror asymmetry in CsEu(SO4)2. The chemical shift of the 5D0 energy level in cesium europium sulfate hydrate, with respect to cesium europium sulfate, is associated with the presence of H2O molecules in the vicinity of Eu3+ ion.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisenko Y. G., Sedykh A. E., Basova S. A., Atuchin V. V., Molokeev M. S., Aleksandrovsky A. S., Krylov A. S., Oreshonkov A. S., Khritokhin N. A., Sal'nikova E. I., Andreev O. V., Muller-Buschbaum K.
Заглавие : Exploration of the structural, spectroscopic and thermal properties of double sulfate monohydrate NaSm(SO4)2·H2O and its thermal decomposition product NaSm(SO4)2
Место публикации : Adv. Powder Technol. - 2021. - Vol. 32, Is. 11. - P.3943-3953. - ISSN 09218831 (ISSN), DOI 10.1016/j.apt.2021.08.009
Примечания : Cited References: 81. - This work was partly supported by the Russian Science Foundation (21-19-00046) and Russian Foundation for Basic Research (Grant 19-33-90258\19). The use of the equipment of Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: Samarium-sodium double sulfate crystalline hydrate NaSm(SO4)2·H2O was obtained by the crystallization from an aqueous solution containing equimolar amounts of ions. The anhydrous salt of NaSm(SO4)2 was formed by a thermally induced release of the equivalent of water from NaSm(SO4)2·H2O. The kinetic parameters of thermal decomposition were determined (Ea = 102 kJ/mol, A = 9·106). The crystal structures of both compounds were refined from the X-ray powder diffraction data. Sulfate hydrate NaSm(SO4)2·H2O crystallizes in the trigonal symmetry, space group P3121 (a = 6.91820(3) and c = 12.8100(1) Å, V = 530.963(7) Å3). The anhydrous salt crystallizes in the triclinic symmetry, space group P-1 (a = 6.8816(2), b = 6.2968(2) and c = 7.0607(2) Å, α = 96.035(1), β = 99.191(1) and γ = 90.986(1)°, V = 300.17(1) Å3). The vibrational properties of compounds are mainly determined by the sulfate group deformations. The luminescence spectra of both sulfates are similar and are governed by the transitions of samarium ions 4G5/2 → 6HJ (J = 5/2, 7/2, 9/2 and 11/2). The anhydrous sulfate is stable up to 1100 K and undergoes an almost isotropic expansion when heated. After 1100 K, the compound decomposes into Sm2(SO4)3 and Na2SO4.
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