scholarly journals Электрические взаимодействия в смесях сегнетоэлектрических порошков хлорида диизопропиламмония и титаната свинца

2021 ◽  
Vol 63 (6) ◽  
pp. 772
Author(s):  
С.В. Барышников ◽  
А.Ю. Милинский
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Cooling Mode ◽  
Powder Mixtures ◽  
Heating And Cooling ◽  
Additional Phase

The results of studies of phase transitions in mixtures of C6H16NCl (DIPAC) powders with PbTiO3 by the method of differential thermal analysis (DTA) are pre-sented. The measurements were carried out in the heating and cooling mode in the tem-perature range from 300 to 440 K. It was found that electrical interactions between ferroelectric particles lead to the appearance of additional phase transitions for DIPAC in powder mixtures.

scholarly journals Эффекты взаимодействия в смесях сегнетоэлектрических порошков C-=SUB=-6-=/SUB=-H-=SUB=-16-=/SUB=-NBr и PbTiO-=SUB=-3-=/SUB=-

2020 ◽  
Vol 62 (11) ◽  
pp. 1855
Author(s):  
С.В. Барышников ◽  
А.Ю. Милинский
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Comparative Analysis ◽  
Lead Titanate ◽  
Powder Mixtures ◽  
New Phase

The results of phase transitions studies in the mixture of C6H16NBr (DIPAB) and PbTiO3 powders and xPbTiO3−(1 − x)C6H16NBr composites for x from 0.05 to 0.45 by the method of differential thermal analysis (DTA) are reported. A comparative analysis of the DTA signal and ε΄(T) composites xPbTiO3−(1 − x)C6H16NBr is presented. It was shown that the addition of lead titanate to C6H16NBr leads to the appearance of new phase transitions both in composites and in powder mixtures.

Differential Thermal Analysis Studies on Ag2CO3

1971 ◽  
Vol 49 (24) ◽  
pp. 3986-3993 ◽  
Author(s):  
G. D. Nagy ◽  
J. B. Vergette ◽  
J. P. Connolly
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Diffraction Pattern ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
X Ray ◽  
Heating And Cooling ◽  
Reversible Phase ◽  
Silver Metal

The decomposition and phase transitions that occur during the heating and cooling of Ag2CO3 were studied by differential thermal analysis at heating rates of 7 to 14° per min. In helium, the Ag2CO3 was partially decomposed evolving CO2 (7–35% depending upon the method of preparation) giving rise to peaks at 190 to 200°; at 350 to 400°, two endothermic peaks were observed at which CO2 and O2 were given off simultaneously, leaving silver metal. In CO2 the initial partial decomposition gave rise to a peak at about 265°. The partially decomposed Ag2CO3 (Ag2O•nCO2, where n is less than one) gave the same X-ray diffraction pattern as Ag2O, which slowly converted to that for Ag2CO3 if left exposed to air or CO2. The Ag2O•nCO2 undergoes two distinct "reversible" phase transitions at 180 and 197° on subsequent reheatings. The Ag2O•nCO2 behaves like a clathrate-type of structure in which CO2 can be entrapped in the Ag2O lattice.

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

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.

High-Temperature Modifications of Thorium Dicarbide

1964 ◽  
Vol 8 ◽  
pp. 78-85 ◽  
Author(s):  
P. K. Gantzel ◽  
S. Langer ◽  
N. L. Baldwin ◽  
F. L. Kester
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
High Temperature ◽  
Thermal Effects ◽  
Room Temperature ◽  
Thermal Analyses ◽  
Tetragonal Modification ◽  
X Ray ◽  
Space Groups ◽  
Heating And Cooling

AbstractThermal analyses of samples of thorium dicarbide in equilibrium with graphite show arrests which indicate phase transitions at 1427 ± 21°C arid 1481 ± 28°C. These thermal effects have been observed on heating and cooling both in standard thermal analysis and in differential thermal analysis using graphite as a reference material. The microstructure of thorium dicarbide samples shows the characteristic “herringbone” pattern of a material which has undergone a martensitic-type transition.A high-temperature X-ray investigation has revealed that the observed thermal arrests correspond to erystallographic transformations. The monodinic modification found at room temperature is stable to 1427°C, at which temperature a tetragonal modification with a0 = 4.235 ± 0.002Å and c0 = 5.408 ± 0.002Å is formed. At 1481°C, the tetragonal is transformed to cubic with a0 = 5.809 ± 0.002 Å. The best agreement between observed and calculated intensities has been obtained with C-C units of 1.5-Å assumed bond length in space groups P42/mmc and Pa3 for the tetragonal and cubic modifications, respectively.

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

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]

Phasendiagramme von (NH4, M)X und(ND4, M)X mit M = Tl, Rb oder Cs und X=Cl oder Br / Phase Diagrams of (NH4, M)X and (ND4, M)X with M = Tl, Rb or Cs and X = Cl or Br

1979 ◽  
Vol 34 (7) ◽  
pp. 862-866 ◽  
Author(s):  
Peter Brauer
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Transitions ◽  
Phase Diagrams ◽  
Isotope Effect ◽  
Lattice Constant ◽  
Negative Pressure ◽  
Phase Iii ◽  
Lattice Constants ◽  
Mixed Systems

Phase transitions in (NH4, M)Cl with M=Tl, Rb or Cs and (ND4, Tl)Cl as well as (NH4, M)Br and (ND4, M)Br are measured using birefringence or differential thermal analysis. The phase diagrams of the mixed systems with M=Tl having decreasing lattice constant with increasing amount of Tl are similar to the well known T(P) diagrams. Therefore the diagrams of the sys­tems with M=Rb or Cs having increasing lattice constants correspond to T(P) diagrams in the range of fictitious negative pressure P. Substitution of D for H produces an effect similar to reducing the lattice constant. The extraordinary large negative isotope effect of II-III transitions and the appearance of the birefringent phase III in the chlorides are now understood.

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