Effect of the Se → Te substitutions on thermal properties of binary Bi2Se3 semiconductor

2020 ◽  
Vol 34 (15) ◽  
pp. 2050156 ◽  
Author(s):  
S. R. Azimova ◽  
N. M. Abdullayev ◽  
Y. I. Aliyev ◽  
M. N. Mirzayev
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Free Energy ◽  
Differential Thermal Analysis ◽  
Thermal Properties ◽  
Phase Transitions ◽  
Thermodynamic Parameters ◽  
Thermophysical Properties ◽  
Hydroxide Group

[Formula: see text] and [Formula: see text] compounds were synthesized and the thermophysical properties were investigated by differential thermal analysis. It was determined that the DSC spectrum of the [Formula: see text] compounds is divided into three regions. The first region was explained by the splitting of water and hydroxide groups in the compound, and the second and third regions with phase transitions. The DSC spectrum of the [Formula: see text] compound was somewhat simpler. The spectrum, divided into two regions, consisted of the first region observed by the decomposition of the water and hydroxide group, and the second region corresponding to the phase transition. Thermodynamic parameters of phase transitions, enthalpy and free energy, were determined.

Behavior of thermal properties of AgCu1−xFexS compounds under non-isothermal conditions

2019 ◽  
Vol 33 (28) ◽  
pp. 1950339 ◽  
Author(s):  
Y. I. Aliyev ◽  
P. R. Khalilzade ◽  
Y. G. Asadov ◽  
T. M. Ilyasli ◽  
F. M. Mammadov ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermal Properties ◽  
Phase Transitions ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Partial Replacement ◽  
Isothermal Conditions ◽  
The Given

AgCu[Formula: see text]Fe[Formula: see text]S compounds were synthesized by partial Cu[Formula: see text][Formula: see text][Formula: see text]Fe replacement in the AgCuS crystal at a concentration range of 0[Formula: see text][Formula: see text][Formula: see text]x[Formula: see text][Formula: see text][Formula: see text]0.03. In the differential thermal analysis spectrum obtained at a temperature range of 300 K[Formula: see text][Formula: see text][Formula: see text]T[Formula: see text][Formula: see text][Formula: see text]1300 K, endoeffect corresponding to the structural phase transition in the AgCuS compound was observed at the temperature T[Formula: see text]=[Formula: see text]938 K. It has been determined that this result is also observed in the AgCu[Formula: see text]Fe[Formula: see text]S compound obtained by partial replacement of Cu atoms by Fe atoms. However, in the compound of AgCu[Formula: see text]Fe[Formula: see text]S this effect was observed at higher temperatures. The thermal capacities and enthalpies of phase transitions were calculated for the given compounds.

The thermal properties of SnSe and Sm1−xCexSnSe2 (x = 0.02–0.5) compounds

2020 ◽  
Vol 34 (18) ◽  
pp. 2050167
Author(s):  
V. A. Abdurahmanova ◽  
N. M. Abdullaev ◽  
Sh. S. Ismayilov ◽  
M. N. Mirzayev
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermal Properties ◽  
Thermodynamic Parameters ◽  
Symmetric Structure

SnSe and [Formula: see text] compounds based on SnSe have been synthesized. Thermal properties of SnSe and [Formula: see text] compounds within [Formula: see text] concentration ranges of Ce atoms have been investigated using Differential Thermal Analysis (DTA). Thermodynamic parameters were calculated based on DTA spectra within [Formula: see text] temperature intervals. It was determined from the relation of different rates concentrations of Sm and Ce elements on energies that [Formula: see text] system compounds have their high symmetric structure in the form of [Formula: see text]. Thermodynamic parameters were determined for each system and the changing mechanism of these parameters depending on concentration of Ce atoms was performed.

Effect of CdI2 on electrical conductivity and phase transition behavior in AgI

1981 ◽  
Vol 59 (18) ◽  
pp. 2685-2688 ◽  
Author(s):  
Mahadeva Natarajan ◽  
Etalo A. Secco
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Electrical Conductivity ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Phase Transition Behavior ◽  
Polymorphic Behavior ◽  
X Ray ◽  
Transition Behavior ◽  
Low Concentrations

The phase transitions occurring in AgI containing dissolved CdI2 have been examined by differential thermal analysis (DTA), electrical conductivity technique, and X-ray diffractometry. The electrical conductivity and polymorphic behavior of AgI is significantly modified by low concentrations of CdI2. The results are interpreted in terms of substitutional Cd2+ and Ag+ vacancies in AgI sublattice.

scholarly journals Struktur- und Phasenübergangsuntersuchungen an β-Li2ZnGe/ Structure and Phase Transition Investigations on β-Li2ZnGe

1981 ◽  
Vol 36 (8) ◽  
pp. 917-921 ◽  
Author(s):  
Hans-Otto Cullmann ◽  
Heinz-Walter Hinterkeuser ◽  
Hans-Uwe Schuster
Keyword(s):  
Phase Transition ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Single Crystal ◽  
Ternary Compound ◽  
Type Structure ◽  
Crystal Data ◽  
Space Group ◽  
Cell Parameters ◽  
Structure Space

Abstract The ternary compound β-Li2ZnGe was prepared and its structure determined from powder and single crystal data. The compound crystallizes in a modified Na3As type structure, space group Ṗ̇̇̇̇̇̇̇̇̇̇̇̇̇̇3̄m 1 - D33d.The cell parameters are: a = 432.6 pm, c = 1647.0 pm, c/a= 3.83.A phase transition between a-and β-Li2ZnGe was found and the reaction of the elements lithium, zinc and germanium to a-Li2ZnGe was followed by differential thermal analysis. The temperatures and the enthalpies of transition and fusion were determined.

Differential Thermal Analysis and Dielectric Studies on Neopentanol under Pressure

1992 ◽  
Vol 47 (11) ◽  
pp. 1127-1134 ◽  
Author(s):  
H. G. Kreul ◽  
R. Waldinger ◽  
A. Würflinger
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Relaxation Time ◽  
Phase Transitions ◽  
Dielectric Relaxation ◽  
Pressure Dependence ◽  
Dielectric Relaxation Time ◽  
Dielectric Studies ◽  
Dielectric Measurements ◽  
Plastic Phase

Abstract Differential thermal analysis (DTA) and dielectric measurements have been performed on 2,2-dimethyl- 1-propanol (neopentanol) up to 200 MPa. Neopentanol exhibits at least one orientationally disordered (ODIC) phase (solid I) that transforms at lower temperatures to a non-plastic phase (solid II). There is evidence of a further ODIC phase denoted as solid I'. The pressure dependence of the phase transitions and the dielectric behaviour up to frequencies of 13 MHz are described. Activation enthalpies and volumes are derived from the dielectric relaxation time and compared with results for other alcohols

Phase Transitions

2019 ◽  
pp. 205-222
Author(s):  
Robert H. Swendsen
Keyword(s):  
Phase Transition ◽  
Free Energy ◽  
Phase Transitions ◽  
Helmholtz Free Energy ◽  
Equations Of State ◽  
Van Der Waals ◽  
Ideal Gas ◽  
Phase Rule ◽  
Clapeyron Equation ◽  
Maxwell Construction

Phase transitions are introduced using the van der Waals gas as an example. The equations of state are derived from the Helmholtz free energy of the ideal gas. The behavior of this model is analyzed, and an instability leads to a liquid-gas phase transition. The Maxwell construction for the pressure at which a phase transition occurs is derived. The effect of phase transition on the Gibbs free energy and Helmholtz free energy is shown. Latent heat is defined, and the Clausius–Clapeyron equation is derived. Gibbs' phase rule is derived and illustrated.

New phase transitions in ceramic SrSnO3: Raman scattering analysis and differential thermal analysis

2008 ◽  
Vol 20 (5) ◽  
pp. 055210 ◽  
Author(s):  
Manoj K Singh ◽  
Naba K Karan ◽  
Ram S Katiyar ◽  
J F Scott ◽  
H M Jang
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Raman Scattering ◽  
New Phase

Influence of Eu3+ on Physical and Thermal Properties of Borotellurite Glass Containing Manganese Oxides Nanoparticles

2017 ◽  
Vol 268 ◽  
pp. 124-127
Author(s):  
Md Rahim Sahar ◽  
Siti Maisarah Aziz ◽  
K. Sulhadi
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Thermal Properties ◽  
Manganese Oxides ◽  
Melt Quenching ◽  
Xrd Pattern ◽  
Amorphous Nature ◽  
Quenching Method ◽  
Europium Concentration ◽  
Manganese Nanoparticles

The influence of the europium concentration on the physical and thermal properties of manganese nanoparticles (Mn3O4 NPs) ) embedded borotellurite glass are studied. Glasses with composition (59-x)TeO2-30B2O3-10MgO-xEu2O3-1Mn3O4 (where x = 0.5, 1.0 and 1.5 mol%) are prepared by melt-quenching method and characterized using XRD and Differential Thermal Analysis (DTA). The XRD pattern confirms the amorphous nature of all samples.The physical properties such as density (ρ) and molar volume (Vm) are calculated. The thermal properties of borotellurite glasses show that the glass with 1.0 mol % of Eu2O3 possess the highest stability.

Ober Phaseniibergange von Ammonium-Alkali-Jodiden und verwandten Halogeniden / Phase Transitions of Ammonium-alkali Iodides and Related Halides

1981 ◽  
Vol 36 (3) ◽  
pp. 222-225 ◽  
Author(s):  
Peter Brauer
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Martensitic Transition ◽  
Temperature Range

The investigation of the order-disorder transitions of the ammonium-chlorides and -bromides, in which some of the NH4+ are replaced by Cs+, Rb+ or K+, is extended to the corresponding iodides using birefringence and differential thermal analysis. As the temperature range of the martensitic transition (Pm 3 m↔Fm 3 m) is now overlapping the temperature range of the orderdisorder transitions, the former must be included in the measurements. The results allowing an overlook are discussed using the work of Garland, Lushington, and Leung [5]

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