Comparative analysis of elastocaloric and barocaloric effects in single-crystal and ceramic ferroelectric (NH4)2SO4

2021 ◽  
Vol 191 ◽  
pp. 149-154
Author(s):  
Ekaterina Mikhaleva ◽  
Mikhail Gorev ◽  
Vitaly Bondarev ◽  
Evgeny Bogdanov ◽  
Igor Flerov
Keyword(s):  
Comparative Analysis ◽  
Single Crystal ◽  
Ceramic Ferroelectric

Crystal architecture of R 2SnS5 (R = Pr, Nd, Gd and Tb): crystal structure relationships in chalcogenides

2008 ◽  
Vol 64 (2) ◽  
pp. 172-176 ◽  
Author(s):  
Marek Daszkiewicz ◽  
Lubomir D. Gulay ◽  
Vasylyna Ya. Shemet
Keyword(s):  
Crystal Structure ◽  
Comparative Analysis ◽  
Single Crystal ◽  
Copper Ions ◽  
Stoichiometric Compound ◽  
Single Crystal Diffraction ◽  
Interatomic Distances ◽  
X Ray ◽  
Structural Relationships ◽  
Complex Architecture

The crystal structure of the R 2SnS5 (R = Pr, Nd, Gd and Tb) compounds has been investigated using X-ray single-crystal diffraction. Crystal architecture and structural relationships among U3S5, Y2HfS5, R 2SnS5 compounds are discussed and a structural origin is determined. It is shown that the complex architecture of the crystal structure of Eu5Sn3S12 is a result of interweaving of the simple crystal structures. The location of the copper ions in the non-stoichiometric compound Y2Cu0.20Sn0.95S5 is proposed on the basis of comparative analysis of the R—S interatomic distances in the R 2SnS5 series of compounds.

scholarly journals Температурная зависимость проводимости нитевидных кристаллов теллура

2021 ◽  
Vol 55 (6) ◽  
pp. 493
Author(s):  
М.Р. Рабаданов ◽  
А.А. Степуренко ◽  
А.Э. Гумметов ◽  
А.М. Исмаилов
Keyword(s):  
Electrical Conductivity ◽  
Electron Microscope ◽  
Comparative Analysis ◽  
Single Crystal ◽  
Diffuse Scattering ◽  
Epitaxial Film ◽  
Thermal Excitation ◽  
Increasing Temperature ◽  
Classical Size ◽  
Scanning Electron

In the temperature range 77−273K, a comparative analysis of the electrical conductivity of a whisker, an epitaxial film, and a single crystal of tellurium was undertaken. The electrical conductivity of the film and the single crystal increased monotonically up to 200K, then began to rise steeply, corresponding to thermal excitation of intrinsic carriers. The electrical conductivity of whiskers decreased with increasing temperature to 230K, after which it began to increase more gradually. It is assumed that in the case of tellurium whiskers, the classical size effect took place: the decrease in electrical conductivity was due to diffuse scattering of carriers by the lateral surface of the tellurium crystal and was intensified with increasing temperature. The uneven, tightly-convoluted surface of the samples was shown in images produced in a scanning electron microscope in the nanometer range.

Synthesis of MnGeO3 polycrystalline and single-crystal samples and comparative analysis of their magnetic properties

2008 ◽  
Vol 246 (1) ◽  
pp. 206-214 ◽  
Author(s):  
N. V. Sapronova ◽  
N. V. Volkov ◽  
K. A. Sablina ◽  
G. A. Petrakovskii ◽  
O. A. Bayukov ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Comparative Analysis ◽  
Single Crystal

scholarly journals ANALYSIS OF THE SEPARATION METHODS OF OPTICAL SPECTRA FOR INDIVIDUAL COMPONENTS

2018 ◽  
Vol 8 (4) ◽  
pp. 8-11
Author(s):  
Victor Makhniy ◽  
Oksana Kinzerska ◽  
Illia Senko
Keyword(s):  
Comparative Analysis ◽  
Single Crystal ◽  
Spectral Characteristics ◽  
Emission Spectra ◽  
Optical Spectra ◽  
Modulation Spectroscopy ◽  
Direct Differentiation Method ◽  
Direct Differentiation ◽  
Differentiation Method

A comparative analysis of various methods for the decomposition of broad bands into individual components has been carried out. It is shown that the most universal are the methods of modulation spectroscopy and direct differentiation of conventional spectral characteristics, which, unlike the widely used Alentsev-Fock method, are applicable to spectra of any type (luminescence, transmission, absorption, etc.). The features and capabilities of the direct differentiation method are used to identify the structure in the emission spectra and transmission of ZnSe <Al> single-crystal substrates.

Study of the elastic properties of hexagonal metal single crystals

2019 ◽  
Vol 85 (9) ◽  
pp. 29-35
Author(s):  
V. V. Krasavin ◽  
A. V. Krasavin
Keyword(s):  
Comparative Analysis ◽  
Single Crystal ◽  
Single Crystals ◽  
Elastic Properties ◽  
Elastic Compliance ◽  
Crystallographic Direction ◽  
Nuclear Industry ◽  
Hexagonal Axis ◽  
Metal Single Crystals ◽  
Hexagonal Metals

Hexagonal metals (e.g., Be, Zr, Ti) are widely used in the nuclear industry, space and aircraft engineering (in manufacturing of the structural elements operating under extreme conditions). A promising way to improve the quality of products made of them is to improve the physical properties of materials using the natural anisotropy of metal single crystals. The results of studying anisotropy and a comparative analysis of the technical characteristics of the elastic properties of single crystals of hexagonal metals are presented. The equations of the elastic compliance matrix components are derived in the explicit form for arbitrary crystallographic direction proceeding from transformations of the elastic compliance tensor in the principal axes to a new arbitrary coordinate system with a subsequent use of Euler angles. Analytical expressions are presented for the technical characteristics of the elastic properties (shear and Young's moduli, Poisson's ratio) of the single crystals of 10 hep metals for an arbitrary crystallographic direction. The axial symmetry of the characteristics about the hexagonal axis is revealed. The sums of the elastic compliance coefficients which determine the shear moduli and the Poisson's ratios in two mutually perpendicular directions are constant in any crystallographic plane of the single crystal. A comparative analysis of the anisotropy of the elastic properties of single crystals of the studied group of metals revealed auxetic properties of Zn and Be single crystals and the region of crystallographic directions of uniaxia tension, leading to an auxetic effect The auxetic effect in Zn was observed under tension in the directions of the plane perpendicular to the hexagonal axis of the single crystal. The planes of the auxetic effect manifestation in Be single crystals are perpendicular to the directions making an angle of 45° with the hexagonal axis.

Sign in / Sign up

Export Citation Format

Share Document