scholarly journals Thermodynamic properties of single crystals based on lithium tungstate by reaction and DSC calorimetry

2021 ◽  
Vol 2119 (1) ◽  
pp. 012140
Author(s):  
N I Matskevich ◽  
V N Shlegel ◽  
D A Samoshkin ◽  
S V Stankus ◽  
A N Semerikova ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Temperature Gradient ◽  
Single Crystals ◽  
Czochralski Technique ◽  
Formation Enthalpies ◽  
Stabilization Energies ◽  
Mo Content ◽  
First Time ◽  
Lithium Tungstate ◽  
Dsc Calorimetry

Abstract For the first time, single crystals of undoped lithium tungstate and lithium tungstate doped by 1.25% molybdenum were grown by the low-temperature-gradient Czochralski technique. The standard formation enthalpies, lattices enthalpies, stabilization energies, and the heat capacity were determined in the temperature range of 320-997 K. The lattice enthalpy dependence on Mo content was constructed.

scholarly journals Heat capacity of lithium tungstate single crystal by DSC calorimetry data in the temperature range of 319-997 K

2021 ◽  
Vol 2057 (1) ◽  
pp. 012048
Author(s):  
N I Matskevich ◽  
V N Shlegel ◽  
A A Chernov ◽  
D A Samoshkin ◽  
S V Stankus ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Phase Transitions ◽  
Single Crystal ◽  
Weight Control ◽  
Czochralski Technique ◽  
Temperature Range ◽  
First Time ◽  
Lithium Tungstate ◽  
Dsc Calorimetry ◽  
Calorimetry Data

Abstract The heat capacity of lithium tungstate single crystal (Li2WO4) was measured for the first time in the temperature range of 319-997 K. The experiments were carried out by DSC calorimetry. The Li2WO4 single crystal was first grown by low-temperature-gradient Czochralski technique with weight control. The temperature dependence of Li2WO4 heat capacity in the temperature range 319-997 K was monotonic. According to results of our studies, there were no phase transitions in Li2WO4 in the investigated temperature range.

Single crystals of undoped Li2WO4 and Li2W1-0.0125Mo0.0125O4: Formation enthalpies, heat capacity in the temperature range 320-997 K

2021 ◽  
Author(s):  
Nata Ivanovna Matskevich ◽  
V.N. Shlegel ◽  
Anna Nikolaevna Semerikova ◽  
Dmitrii Andreevich Samoshkin ◽  
Veronika D. Grigoryeva ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Low Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Weight Control ◽  
Rare Events ◽  
Temperature Gradients ◽  
Czochralski Technique ◽  
Temperature Range ◽  
Formation Enthalpies

The Li2WO4 single crystal was first grown applying unique Czochralski technique with weight control and low-temperature-gradients. Single crystal of Li2WO4 is one of the perspective materials to search rare events....

Growth of Na2W2O7 Single Crystals as Possible Optical Host Material

2014 ◽  
Vol 213 ◽  
pp. 160-164 ◽  
Author(s):  
T.A. Gavrilova ◽  
N.V. Ivannikova ◽  
V.N. Shlegel ◽  
V.D. Grigorieva ◽  
S.F. Solodovnikov ◽  
...  
Keyword(s):  
Solid State ◽  
Low Temperature ◽  
Temperature Gradient ◽  
Single Crystals ◽  
Charge Compensation ◽  
Xrd Analysis ◽  
Czochralski Technique ◽  
High Quality ◽  
Phase Purity ◽  
Ce Content

High-quality Na2W2O7 single crystals have been grown by low temperature gradient Czochralski technique (LTG Cz). The phase purity of grown crystals has been verified by XRD analysis. A set of oxide compositions based on Na2W2O7 and doped with Ce and special additions for charge compensation has been prepared by solid state synthesis. The formation of Na2W2O7-based solid solutions is found at as high Ce content as ~ 5 mol%.

Low temperature luminescence of ZnMoO4 single crystals grown by low temperature gradient Czochralski technique

2012 ◽  
Vol 34 (11) ◽  
pp. 1804-1810 ◽  
Author(s):  
D.A. Spassky ◽  
V.V. Mikhailin ◽  
A.E. Savon ◽  
E.N. Galashov ◽  
V.N. Shlegel ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Gradient ◽  
Single Crystals ◽  
Czochralski Technique

Multicanonical Molecular Dynamics Simulation Study of the Liquid-Solid and Solid-Solid Transitions in Lennard-Jones Clusters

2011 ◽  
Author(s):  
Toshihiro Kaneko ◽  
Kenji Yasuoka ◽  
Ayori Mitsutake ◽  
Xiao Cheng Zeng
Keyword(s):  
Molecular Dynamics ◽  
Heat Capacity ◽  
Transition Temperature ◽  
Peak Position ◽  
Temperature Curve ◽  
Dynamics Simulation ◽  
Lennard Jones ◽  
Dynamics Simulations ◽  
First Time ◽  
Good Agreement

Multicanonical molecular dynamics simulations are applied, for the first time, to study the liquid-solid and solid-solid transitions in Lennard-Jones (LJ) clusters. The transition temperatures are estimated based on the peak position in the heat capacity versus temperature curve. For LJ31, LJ58 and LJ98, our results on the solid-solid transition temperature are in good agreement with previous ones. For LJ309, the predicted liquid-solid transition temperature is also in agreement with previous result.

Weak ferromagnetic response in PbZr1−xTixO3 single crystals

2019 ◽  
Vol 7 (36) ◽  
pp. 11085-11089
Author(s):  
Iwona Lazar ◽  
Monika Oboz ◽  
Jerzy Kubacki ◽  
Andrzej Majchrowski ◽  
Julita Piecha ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Single Crystals ◽  
Room Temperature ◽  
Ferromagnetic Hysteresis ◽  
First Time ◽  
Ferromagnetic Hysteresis Loop ◽  
Weak Ferromagnetic

For the first time, a weak ferromagnetic hysteresis loop at room temperature has been observed in PbZr1−xTixO3 (PZT) single crystals.

Large-sized crystal growth and piezoelectric properties of the single crystals of LiNa5Mo9O30

CrystEngComm ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1912-1917
Author(s):  
Xiaoli Du ◽  
Fuan Liu ◽  
Zeliang Gao ◽  
Xiaojie Guo ◽  
Xiangmei Wang ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Crystal Growth ◽  
Single Crystals ◽  
Piezoelectric Properties ◽  
First Time ◽  
Octahedral Distortion

Single crystals of LiNa5Mo9O30 with seeds in the a-, b- and c-directions were successfully grown using the TSSG method. Full sets of dielectric, elastic and piezoelectric matrices of the crystal were determined first time. The octahedral distortion and dipole moment are calculated to explain the piezoelectric properties.

scholarly journals Internal melt figures in ice by rapid adiabatic compression

1994 ◽  
Vol 40 (134) ◽  
pp. 132-134
Author(s):  
R.E. Gagnon ◽  
C. Tulk ◽  
H. Kiefte
Keyword(s):  
Phase Transformations ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Adiabatic Compression ◽  
Air Bubbles ◽  
Water Ice ◽  
Deep Focus ◽  
And Behavior ◽  
First Time

AbstractSingle crystals and bicrystals of water ice have been adiabatically pressurized to produce, and clearly illustrate, two types of internal melt figures: (1) dendritic figures that grow from nucleation imperfections on the specimen’s surface, or from air bubbles at grain boundaries, into the ice as pressure is elevated; and (2) compression melt fractures, flat liquid-filled disks, that nucleate at imperfections in the crystal and grow with the application of pressure eventually to sprout dendritic fingers at the periphery. The transparency of the ice permitted visualization of the growth and behavior of the figures, and this could be an important tool in understanding the role of phase transformations in deep-focus earthquakes. Correlation between figure size and pressure is noted for the first time.

scholarly journals Temperature Dependence of Thermophysical Properties of Full-Scale Corium of Fast Energy Reactor

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Mazhyn K. Skakov ◽  
Nurzhan Ye. Mukhamedov ◽  
Alexander D. Vurim ◽  
Ilya I. Deryavko
Keyword(s):  
Heat Capacity ◽  
Thermal Diffusivity ◽  
Fast Reactor ◽  
Thermophysical Properties ◽  
Heat Conductivity ◽  
Nuclear Reactor ◽  
Reactor Vessel ◽  
Full Scale ◽  
Temperature Fields ◽  
First Time

For the first time the paper determines thermophysical properties (specific heat capacity, thermal diffusivity, and heat conductivity) of the full-scale corium of the fast energy nuclear reactor within the temperature range from ~30°С to ~400°С. Obtained data are to be used in temperature fields calculations during modeling the processes of corium melt retention inside of the fast reactor vessel.

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