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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : VORONOV V. N., GOREV M. V., KOT L. A., FLEROV I. N.
Заглавие : HEAT-CAPACITY OF RBALF4
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1989. - Vol. 31, Is. 5. - P303-305. - ISSN 0367-3294
Примечания : Cited References: 10
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Yamaguchi T., Sawada S., Горев, Михаил Васильевич, Aleksandrov K. S.
Заглавие : Thermodynamic investigations of ferroelastic phase transitions in K 2ZnCl4 and K2CoCl4
Место публикации : Journal of the Physical Society of Japan. - 1992. - Vol. 61, Is. 5. - P.1606-1608. - ISSN 0031-9015, DOI 10.1143/JPSJ.61.1606
Ключевые слова (''Своб.индексиров.''): (nh4) 2so4 family ferroelectrics--ferroelasticity--ferroelectricity--heat capacity--hydrostatic pressure--k2cocl4--k2zncl4--rb2zncl 4group ferroelectrics
Аннотация: Using the adiabatic calorimeter the heat capacity of K2ZnCl 4 and K2CoCl4 crystals was measured in temperature range 100?300 K. The entropy change for ferroelastic phase transition was estimated to be ? S=0.34 (Zn) and 0.33 (Co) JВ·mol-1K-1. The effect of hydrostatic pressure on the phase transition was investigated for both crystals.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : MELERO J. J., BARTOLOME J., BURRIEL R., ALEKSANDROVA I. P., PRIMAK S.
Заглавие : HEAT-CAPACITY MEASUREMENT OF THE SUCCESSIVE PHASE-TRANSITIONS IN CS2ZNI4
Разночтения заглавия :us: Heat capacity measurement of the successive phase transitions in Cs2ZnI4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1995. - Vol. 95, Is. 4. - P201-206. - ISSN 0038-1098, DOI 10.1016/0038-1098(95)00261-8
Примечания : Cited References: 20
Предметные рубрики: INCOMMENSURATE PHASE
SEQUENCE
CRYSTALS
CS2CDI4
Ключевые слова (''Своб.индексиров.''): ferroelectrics--heat capacity--phase transitions--incommensurate phases
Аннотация: The heat capacity of a Cs2ZnI4 single crystal has been measured by means of AC calorimetry. Three anomalies have been detected corresponding to a normal to inconmensurate phase transition at T-I = 116.9+/-0.1 K, an incommensurate to commensurate lock-in transition at T-L = 107.58+/-0.05 K, and a structural transition from a commensurate orthorhombic to a monoclinic phase at T-C = 93.77+/-0.05 K with thermal hysteresis. The lock-in transition has the peculiarity of being discontinuous but not showing any measurable hysteresis. After comparison with the Landau model predictions for the heat capacity, derived for the k(Delta) = (1/2 + Delta)a* case, it is concluded that Cs2ZnI4 lies close to the Lifschitz point of coexistence of the normal, incommensurate and commensurate phases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Bartolome J., Gorev M. V., Flerov I. N.
Заглавие : Hydrostatic pressure effect on phase transitions in perovskites with ammonium cations
Место публикации : Phys. Status Solidi B. - 2000. - Vol. 217, Is. 2. - P.785-791. - ISSN 0370-1972, DOI 10.1002/(SICI)1521-3951(200002)217:2785::AID-PSSB7853.0.CO;2-Y
Примечания : Cited References: 36
Предметные рубрики: XMF3 CUBIC PEROVSKITES
THERMAL-PROPERTIES
HEAT-CAPACITY
TEMPERATURE DEPENDENCE
DIELECTRIC PROPERTIES
X-RAY
NH4ZNF3
NH4MNCL3
NH4COF3
NH4CDF3
Аннотация: The pressure dependence of the structural phase transition temperature has been measured for the powder samples of NH4MgF3, NH4ZnF3, NH4MnF3, NH4CoF3, NH4CdF3, and NH4MnCl3 perovskites in the pressure range 0 to 600 MPa. It was found that the values of dT(0)/dP are negative for the Mg, Zn. Co. Mn trifluorides and positive for NH4CdF3 and NH4MnCl3. Comparison with the known data for other halide and oxide perovskites allowed to conclude that the sign of dT(0)/dP is correlated with the value of the Goldschmidt tolerance factor of the perovskite, and its value is closely related to the temperature and mechanism of the transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Sciau P.
Заглавие : Heat capacity and p-T phase diagrams of the ordered perovskites Pb2MgWO6 and Pb2CoWO6
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2000. - Vol. 12, Is. 5. - P.559-567. - ISSN 0953-8984, DOI 10.1088/0953-8984/12/5/304
Примечания : Cited References: 25
Предметные рубрики: CRYSTAL-STRUCTURE
X-RAY
TRANSITIONS
PRESSURE
Аннотация: The heat capacities of Pb2MgWO6 and Pb2CoWO6 and the effect of hydrostatic pressure on the phase transitions have been studied on powdered samples by means of an adiabatic calorimeter and DTA performed under pressure, respectively. Thermodynamic parameters, such as change of total excess entropy, latent hear and hysteresis of the phase transition temperature were determined. Entropies and p-T phase diagrams are discussed in connection with structural data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Sciau P.
Заглавие : Heat capacity and the p-T phase diagram of Pb2MgTeO6 elpasolite
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 2. - P345-349. - ISSN 1063-7834, DOI 10.1134/1.1349486
Примечания : Cited References: 17
Предметные рубрики: ORDERED PEROVSKITE PB2MGTEO6
CRYSTAL-STRUCTURE
PB2COWO6
PB2MGWO6
Аннотация: The heat capacity of Pb2MgTeO6 is measured in the temperature range 80-300 K. It is found that the heat capacity exhibits an anomaly associated with the phase transition at T-0 = 186.9 K. The thermodynamic parameters of the structural transformation are determined. The effect of hydrostatic pressure up to 0.5 GPa on the phase transition temperature is examined. (C) 2001 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bondarev V. S., Sciau P.
Заглавие : Heat capacity study of relaxor PbMg1/3Nb2/3O3 in a wide temperature range
Разночтения заглавия :авие SCOPUS: Heat capacity study of relaxor PbMg1/3Nb2/3O 3 in a wide temperature range
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2003. - Vol. 96, Is. 3. - P531-537. - ISSN 1063-7761, DOI 10.1134/1.1567427
Примечания : Cited References: 21
Предметные рубрики: DIFFUSE PHASE-TRANSITION
FERROELECTRICS
Ключевые слова (''Своб.индексиров.''): differential scanning calorimetry--mathematical models--phonons--random processes--specific heat--spectrum analysis--thermal effects--bond-random field models--wide temperature intervals--lead compounds
Аннотация: Heat capacity of the PbMg1/3Nb2/3O3 compound is measured using the methods of adiabatic and differential scanning calorimetry in the temperature range 80-750 K. Two blurred anomalies on the C-p(T) dependence are observed in wide temperature intervals of 200- 400 K and 500-700 K. The results of studies are discussed together with data on the structure and phonon spectrum in the framework of spherical random bond-random field model. (C) 2003 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bondarev V. S., Sciau P., Lehmann A. G.
Заглавие : Heat capacity of the PbFe1/2Ta1/2O3 perovskite-like compound
Разночтения заглавия :авие SCOPUS: Heat Capacity of the PbFe1/2Ta1/2O3 Perovskite-Like Compound
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2004. - Vol. 46, Is. 3. - P521-525. - ISSN 1063-7834, DOI 10.1134/1.1687872
Примечания : Cited References: 26
Предметные рубрики: SINGLE-CRYSTALS
PBFE0.5TA0.5O3
FERROELECTRICS
DIFFRACTION
NIOBATE
GROWTH
Аннотация: The heat capacity C-p(T) of the complex perovskite PbFe1/2Ta1/2O3 has been studied using adiabatic calorimetry in the temperature range 150-370 K. Three diffuse anomalies in C-p(T) are found to exist at temperatures T-d approximate to 350 K, T-m approximate to 250-300 K, and T-c approximate to 205 K. The anomalous and the lattice contribution to the heat capacity are separated, and the change in the entropy is determined. The results of the study are discussed jointly with the data on the structure and physical properties of the compound. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Flerov I. N., Bondarev V. S., Sciau P., Savariault J. M.
Заглавие : Heat capacity and thermal expansion study of relaxor-ferroelectric Ba0.92Ca0.08Ti0.76Zr0.24O3
Разночтения заглавия :авие SCOPUS: Heat capacity and thermal expansion study of relaxor-ferroelectric Ba 0.92Ca0.08Ti0.76Zr0.24O3
Место публикации : J. Phys.: Condens. Matter. - 2004. - Vol. 16, Is. 39. - P.7143-7150. - ISSN 0953-8984, DOI 10.1088/0953-8984/16/39/045
Примечания : Cited References: 18
Предметные рубрики: CERAMICS
BA(TI1-XZRX)O-3
PEROVSKITES
Ключевые слова (''Своб.индексиров.''): calorimetry--dielectric properties--ferroelectric materials--perovskite--phase transitions--solid solutions--specific heat--thermal expansion--adiabatic calorimetry--frequency dispersion--polar domains--relaxor ferroelectrics--barium compounds
Аннотация: Heat capacity and thermal expansion of the Ba0.92Ca0.08Ti0.76Zr0.24O3 compound is measured using the methods of adiabatic calorimetry and optic-mechanical dilatometry in the temperature range 100-370 K. Three blurred anomalies on the C-p(T) and alpha(T) dependencies are observed in the temperature range 200-360 K. The results of the studies are discussed together with data on the structure and dielectric properties in the framework of spherical random bond-random field model.
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10.

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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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rotter I., Sadreev A. F.
Заглавие : Zeros in single-channel transmission through double quantum dots
Место публикации : Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 4. - Ст.46204. - ISSN 1063-651X, DOI 10.1103/PhysRevE.71.046204
Примечания : Cited References: 28
Предметные рубрики: PHASE EVOLUTION
RESONANCE
TRANSPORT
SYSTEMS
Ключевые слова (''Своб.индексиров.''): fano interference--fano resonances--overlapping resonances--transmission amplitude--channel capacity--eigenvalues and eigenfunctions--function evaluation--hamiltonians--mathematical models--mathematical operators--matrix algebra--resonance--signal interference--semiconductor quantum dots
Аннотация: By using a simple model we consider single-channel transmission through a double quantum dot that consists of two single dots coupled by a wire of finite length L. Each of the two single dots is characterized by a few energy levels only, and the wire is assumed to have only one level whose energy depends on the length L. The transmission is described by using S matrix theory and the effective non-Hermitian Hamilton operator H-eff of the system. The decay widths of the eigenstates of H-eff depend strongly on energy. The model explains the origin of the transmission zeros of the double dot that is considered by us. Mostly, they are caused by (destructive) interferences between neighboring levels and are of first order. When, however, both single dots are identical and their transmission zeros are of first order, those of the double dot are of second order. First-order transmission zeros cause phase jumps of the transmission amplitude by pi, while there are no phase jumps related to second-order transmission zeros. In this latter case, a phase jump occurs due to the fact that the width of one of the states vanishes when crossing the energy of the transmission zero. The parameter dependence of the widths of the resonance states is determined by the spectral properties of the two single dots.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Flerov I. N., Sciau P., Savariault J. M.
Заглавие : Heat capacity study of double perovskite-like compounds BaTi1-xZrxO3
Разночтения заглавия :авие SCOPUS: Heat capacity study of double perovskite-like compounds BaTi 1 - XZrxO3
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 12. - P2304-2308. - ISSN 1063-7834, DOI 10.1134/1.2142895
Примечания : Cited References: 19
Предметные рубрики: BATIO3
BA(TI1-XZRX)O-3
FERROELECTRICS
CERAMICS
STATE
FILMS
FIELD
Аннотация: The temperature dependence of the heat capacity of two compositions in the solid solution system BaTi1 - xZrxO3 (x = 0.25, 0.35) was measured using adiabatic calorimetry. In the T-x phase diagram, these compounds occupy positions near the crossover from conventional ferroelectric behavior to the relaxor state. Both compounds reveal diffuse heat capacity anomalies: two anomalies in the temperature ranges 250-350 and 150-200 K at x = 0.35 and one anomaly within the range similar to 150-320 K at x = 0.25. The results obtained are discussed together with structural and dielectric measurements. (c) 2005 Pleiades Publishing, Inc.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Fokina V. D., Molokeev M. S., Vasil'ev A. D., Bovina A. F., Laptash N. M.
Заглавие : Heat capacity, structural disorder, and the phase transition in cryolite (NH4)(3)Ti(O-2)F-5
Разночтения заглавия :авие SCOPUS: Heat capacity, structural disorder, and the phase transition in cryolite (NH4)3Ti(O2)F5
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 8. - P1559-1567. - ISSN 1063-7834, DOI 10.1134/S1063783406080221
Примечания : Cited References: 18
Предметные рубрики: PEROVSKITE-LIKE OXYFLUORIDES
CRYSTAL-STRUCTURES
(NH4)(3)TIOF5
(NH4)(3)WO3F3
DIFFRACTION
Аннотация: The heat capacity, T-p phase diagrams, and unit cell parameters of cryolite (NH4)(3)Ti(O-2)F-5 were studied over a wide temperature range. A phase transition was found near 226 K, and its thermodynamic characteristics and their dependence on the crystallization conditions were determined. The coordinates and thermal parameters of atoms in the Fm3m phase were refined. An analysis of the electron density distribution and the transition entropy showed that the mechanism of the structural transition involves, above all, rotation of the Ti(O-2)F-5 octahedra. Possible models of disordering of tetrahedral ammonium groups are considered.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M., Bondarev V., Sciau P., Savariault J. M.
Заглавие : Heat capacity study of relaxors BaTi0.65Zr0.35O3 and BaTi0.60Zr0.40O3
Разночтения заглавия :авие SCOPUS: Heat capacity study of relaxors BaTi0.65Zr0.35O 3 and BaTi0.60Zr0.40O3
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2006. - Vol. 18, Is. 17. - P.4407-4416. - ISSN 0953-8984, DOI 10.1088/0953-8984/18/17/026
Примечания : Cited References: 21
Предметные рубрики: CERAMICS
BA(TI1-XZRX)O-3
BATIO3
Ключевые слова (''Своб.индексиров.''): calorimetry--composition--data reduction--lead compounds--mathematical models--permittivity--specific heat--adiabatic calorimetry--burns temperature--diffuse anomalies--barium compounds
Аннотация: The heat capacity of two relaxors BaTi(1-x)ZrxO(3) (x = 0.35, 0.40) was measured using adiabatic calorimetry in the temperature range 100-360 K. The Cp(T) dependence of both compositions is characterized by the presence of two diffuse anomalies near the Burns temperature T-d and the temperature of the maximum in permittivity T-m in the temperature ranges 250-350 K and 120 200 K. The anomalous heat capacity near T-d was analysed taking into account the distribution of Zr concentration in nanoregions leading to the distribution of their transition temperatures into the polar phase. Excess heat capacity near Tm was discussed in the framework of the spherical random bond-random field model. The results are compared with the data obtained by the same procedures for PbMg1/3Nb2/3O3 studied experimentally earlier.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Flerov I. N., Maglione M., Simon A.
Заглавие : Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O-3 ceramics
Разночтения заглавия :авие SCOPUS: Heat capacity and thermal expansion study of Ba 0.9Bi 0.067(Ti 1-xZr x)O 3 ceramics
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2007. - Vol. 19, Is. 34. - Ст.346237. - ISSN 0953-8984, DOI 10.1088/0953-8984/19/34/346237
Примечания : Cited References: 15
Предметные рубрики: BA(TI1-XZRX)O-3
STATE
Ключевые слова (''Своб.индексиров.''): adiabatic calorimeters--temperature range--temperature regions--thermal expansion anomaly--barium--ceramic materials--dielectric properties--expansion--specific heat--zirconium--thermal expansion
Аннотация: For Ba0.9Bi0.067(Ti1-xZrx)O-3 (x = 0.04, 0.15) ceramics, the heat capacity C-p(T) and the thermal expansion alpha(T) were measured using an adiabatic calorimeter and an optical-mechanical dilatometer in the temperature range 100-420 K. Both compounds reveal diffuse heat capacity and thermal expansion anomalies: three anomalies in the temperature regions 150-250 K, 250-300 K (alpha(T) only) and 300-400 K at x = 0.04 and two anomalies in the regions 200 250 K and 250-350 K at x = 0.15. The results obtained are discussed together with the data on the dielectric properties.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Fokina V. D., Bovina A. F., Molokeev M. S., Pogorel'tsev E. I., Laptash N. M.
Заглавие : Heat capacity, structure, and p-T phase diagram of elpasolite (NH4)(2)KMoO3F3
Разночтения заглавия :авие SCOPUS: Heat capacity, structure, and p-T phase diagram of elpasolite (NH 4)2KMoO3F3
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 1. - P141-147. - ISSN 1063-7834, DOI 10.1134/S1063783407010234
Примечания : Cited References: 8
Предметные рубрики: TRANSITIONS
Аннотация: Thermophysical and structural studies of an (NH4)(2)KMoO3F3 crystal show that this crystal belongs to the family of elpasolites (space group Fm (3) over barm) and undergoes an order-disorder phase transition at To 241.5 K. Under hydrostatic pressure, this phase transition splits into two consecutive transitions at the tricritical point with parameters T-tr = 232.5 K and p(tr)= 0.21 GPa. It was found that anomalous hysteresis and relaxation phenomena accompany the transitions from the cubic to both distorted phases. The results are analyzed taking into account the data on the phase transition in the related elpasolite (NH4)(2)KWO3F3.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Aleksandrov K. S.
Заглавие : Heat capacity of PMN near an electric-field-induced phase transition
Место публикации : JETP Letters. - 2007. - Vol. 85, Is. 6. - P.283-285. - ISSN 0021-3640, DOI 10.1134/S0021364007060045
Примечания : Cited References: 9
Аннотация: The heat capacity of a single crystal of Pb(Mg1/3Nb2/3)O-3 (PMN) in an electric filed with E = 3 kV/cm applied along the [111] direction has been measured using adiabatic calorimetry over the temperature range 170-250 K. Anomalies in C-P have been found, which correspond to a field-induced phase transition from a relaxor to a ferroelectric state at 225 K under field cooling conditions or at 235-240 K on the subsequent field heating. The field-induced ferroelectric phase persists in a metastable state at low temperatures and is destroyed on zero-field heating at 210 K. The small entropy change Delta S approximate to 0.028R in the field-induced phase transition suggests an insignificant change in the volume fraction of existing polar nanoregions.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Aleksandrov K. S.
Заглавие : Heat capacity study of PMN near fieldinduced phase transition
Коллективы : International Seminar on Ferroelactic Physics
Место публикации : Ferroelectrics. - 2007. - Vol. 360, Is. 1, Pt. 2. - P.37-43. - ISSN 0015-0193, DOI 10.1080/00150190701515964
Примечания : Cited References: 11
Ключевые слова (''Своб.индексиров.''): field-induced phase transition--heat capacity--pmn--field cooling--field model--field-induced phase transition--heat capacities--heat capacity measurements--single crystal wafers--temperature range--zero-field heating--electric fields--single crystals--specific heat--phase transitions
Аннотация: Heat capacity measurements were performed for a single crystal wafer of PMN in the temperature range of 170-250 K applying an electric field E = 3.0 kV/cm along the [111] direction. The heat capacity anomalies related to the phase transition at Tc = 210 K upon zero field heating after field cooling and at Tc = 223 K upon field cooling have been found. The results obtained are discussed together with the data of previous studies in the frame of the spherical random bondrandom field model.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Flerov I. N., Maglione M., Simon A.
Заглавие : Heat capacity and thermal expansion study of Ba0.9Bi0.067(Ti1-xZrx)O3 ceramics
Место публикации : Journal of Physics: Condensed Matter: Institute of Physics and IOP Publishing Limited, 2007. - Т. 19, № 34. - С. 346237. - ISSN 0953-8984, DOI 10.1088/0953-8984/19/34/346237. - ISSN 1361-648X(eissn)
ГРНТИ : 29.19
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