scholarly journals Temperature Dependence of Raman-Active Modes of TlIn(0.95Se0.05)2 Single Crystals

2019 ◽  
Vol 64 (2) ◽  
pp. 173
Author(s):  
O. O. Gomonnai ◽  
M. Ludemann ◽  
A. V. Gomonnai ◽  
I. Yu. Roman ◽  
A. G. Slivka ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Phase Transformations ◽  
Single Crystals ◽  
Raman Spectra ◽  
Temperature Interval ◽  
Half Width ◽  
Vibrational Band ◽  
Temperature Behavior ◽  
Frequency Interval ◽  
Temperature Range

The unpolarized Raman spectra of TlIn(S0.95Se0.05)2 single crystals in the frequency interval 16–340 cm−1 are studied in the temperature interval 30 ≤ T ≤ 293 K. The Raman spectra are analyzed by a multipeak simulation using Lorentzian contours. The temperature behavior of the vibrational band parameters (half-width, intensity, and frequency) is studied with the emphasis on the temperature range, where changes related to phase transformations are revealed.

scholarly journals PSEUDO-GAP FEATURES OF INTRINSIC TUNNELING IN (HgBr2)-Bi2212 SINGLE CRYSTALS

1999 ◽  
Vol 13 (29n31) ◽  
pp. 3758-3763 ◽  
Author(s):  
AUGUST YURGENS ◽  
DAG WINKLER ◽  
TORD CLAESON ◽  
SEONG-JU HWANG ◽  
JIN-HO CHOY
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Room Temperature ◽  
Unit Cell ◽  
Superconducting Gap ◽  
Axis Direction ◽  
Temperature Range ◽  
Dynamic Conductance

The c-axis tunneling properties of both pristine Bi2212 and its HgBr 2 intercalate have been measured in the temperature range 4.2-250 K. Lithographically patterned 7-10 unit-cell heigh mesa structures on the surfaces of these single crystals were investigated. Clear SIS-like tunneling curves for current applied in the c-axis direction have been observed. The dynamic conductance d I/ d V(V) shows both sharp peaks corresponding to a superconducting gap edge and a dip feature beyond the gap, followed by a wide maximum, which persists up to a room temperature. Shape of the temperature dependence of the c-axis resistance does not change after the intercalation suggesting that a coupling between CuO 2-bilayers has little effect on the pseudogap.

scholarly journals Температурная зависимость ширины запрещенной зоны монокристаллов MnAgIn-=SUB=-7-=/SUB=-S-=SUB=-12-=/SUB=-

2019 ◽  
Vol 53 (12) ◽  
pp. 1621
Author(s):  
И.В. Боднарь ◽  
Б.Т. Чан ◽  
В.Н. Павловский ◽  
И.Е. Свитенков ◽  
Г.П. Яблонский
Keyword(s):  
Experimental Data ◽  
Temperature Dependence ◽  
Band Gap ◽  
Single Crystals ◽  
Spinel Structure ◽  
Semiconductor Materials ◽  
Transmittance Spectra ◽  
Temperature Range

AbstractMnAgIn_7S_12 single crystals 16 mm in diameter and ~40 mm in length are grown by planar crystallization of the melt. It is shown that the material grown crystallizes with the formation of the cubic spinel structure. From the transmittance spectra recorded in the region of fundamental absorption in the temperature range 10–320 K, the band gap E _ g of the single crystals and its temperature dependence are determined. The dependence has a shape typical of most semiconductor materials: as the temperature is lowered, the band gap E _ g increases. A calculation is carried out, and it is shown that the calculated values are in agreement with the experimental data.

Plastic Deformations in L10-Ordered Single Crystals with their c/a Ratios Less than Unity

2007 ◽  
Vol 561-565 ◽  
pp. 459-462
Author(s):  
Katsushi Tanaka ◽  
Hiromitsu Ide ◽  
Yoshinori Sumi ◽  
Kyosuke Kishida ◽  
Haruyuki Inui
Keyword(s):  
Shear Stress ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Room Temperature ◽  
The Other ◽  
Compressive Deformation ◽  
Positive Temperature ◽  
Plastic Deformations ◽  
Temperature Range ◽  
Critical Resolved Shear Stress

Compressive deformation of L10-ordered single crystals of FePd whose c/a ratio less than unity have been investigated from room temperature to 823 K. The results show that the critical resolved shear stress (CRSS) for octahedral glide of ordinary dislocations is smaller than that of super-lattice dislocations in all the temperature range investigated, that is the opposite sense to the case of Ti-56 mol% Al. The CRSS for ordinary dislocations virtually independent to the temperature. On the other hand, the CRSS for super dislocations exhibits a weak positive temperature dependence from room temperature up to 573 K and decreases in higher temperatures.

Ionic Conductivity of Li2ZnTi3O8 Single Crystal

2011 ◽  
Vol 497 ◽  
pp. 26-30 ◽  
Author(s):  
Shinichi Furusawa ◽  
Hiroshi Ochiai ◽  
Khoji Murayama
Keyword(s):  
Ionic Conductivity ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Powder Diffraction ◽  
Floating Zone ◽  
Zinc Titanate ◽  
X Ray ◽  
Temperature Range ◽  
First Time

Single crystals of lithium zinc titanate (Li2ZnTi3O8) were grown in a double-mirror type optical floating-zone furnace for the first time. Single crystals were characterized by X-ray powder diffraction and Laue measurements. The ionic conductivity of the single crystals was measured in the temperature range of 400–700 K. Below 600 K, the ionic conductivity of the single crystal is one to two orders of magnitude higher than that of polycrystalline Li2ZnTi3O8. In the temperature range of 550–600 K, the temperature dependence of the ionic conductivity shows non-Arrhenius behaviour.

CREEP ACTIVATION ENERGY OF FLOW PROCESS IN Sn0.2Bi1.8Te3 SINGLE CRYSTALS

2004 ◽  
Vol 11 (04n05) ◽  
pp. 443-446
Author(s):  
P. H. SONI ◽  
C. F. DESAI ◽  
S. R. BHAVSAR
Keyword(s):  
Activation Energy ◽  
Time Dependence ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Vickers Microhardness ◽  
Indentation Creep ◽  
Flow Process ◽  
Creep Activation Energy ◽  
Temperature Range ◽  
Different Temperatures

Temperature dependence of the Vickers microhardness of Sn 0.2 Bi 1.8 Te 3 single crystals has been studied. Loading time dependence of microhardness at different temperatures has been used for creep study in the temperature range 303 K–373 K. The activation energy for indentation creep of the crystals has been evaluated.

Temperature dependence of piezoelectric properties of 0.67 Pb(Mg1/3Nb2/3)O3–0.33 PbTiO3 single crystals

2003 ◽  
Vol 18 (2) ◽  
pp. 537-541 ◽  
Author(s):  
Ping-chu Wang ◽  
Xiao-ming Pan ◽  
Dong-lin Li ◽  
Yuan-wei Song ◽  
Hao-su Luo ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Phase Transition Temperature ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Device Design ◽  
Temperature Range ◽  
Approach Zero

Piezoelectric properties k33 and d33 of 0.67 Pb(Mg1/3Nb2/3)O3–0.33 PbTiO3 single crystals grown by a modified Bridgman method were measured in the temperature range of 20–150 °C. Recoverability of the properties after the samples were heated to 110 °C, above the ferroelectric–ferroelectric (F–F) phase transition temperature of the composition, was found. From 20 to approximately 80 °C, k33 increases slightly, while d33 is almost doubled. Between approximately 90 and 100 °C, k33 decreases sharply to roughly a level of PZT-5 ceramics and d33 decreases to about 700 pC/N. They increase again with further increase of temperature; at 140 °C they attain 0.74 and approximately 1300 pC/N, respectively, and then decrease quickly and approach zero at about 150 °C. When heating to 110 °C followed by cooling to room temperature, the property decay is small. After more than one dozen heating–cooling cycles, k33 and d33 tend to be stable at 0.89 and approximately 1220 pC/N, respectively. The results might be helpful for device design and applications of PMN–PT single crystals.

Temperature dependence of the 1555 cm−1 infrared absorption band in liquid D2O: inflection points

1970 ◽  
Vol 48 (24) ◽  
pp. 3790-3796 ◽  
Author(s):  
R. Oder ◽  
D. A. I. Goring
Keyword(s):  
Absorption Band ◽  
Temperature Dependence ◽  
Temperature Interval ◽  
Infrared Absorption ◽  
Structural Changes ◽  
Peak Height ◽  
Half Width ◽  
Combination Band ◽  
Infrared Absorption Band ◽  
Inflection Points

The temperature dependence curves of the peak height, frequency, and half-width of the infrared intermolecular combination band absorbing at 1555 cm−1 in liquid D2O has been observed to behave sigmoidally between 5 and 70 °C. No evidence of sharp discontinuities has been obtained but inflection points in the rather broad temperature interval of about 25 to 40 °C have been observed. Results are discussed in terms of structural changes occurring in the liquid.

scholarly journals Теплопроводность кубических монокристаллов ZrO-=SUB=-2-=/SUB=-, стабилизированных оксидом иттрия

2020 ◽  
Vol 62 (1) ◽  
pp. 191
Author(s):  
М.А. Борик ◽  
Т.В. Волкова ◽  
А.В. Кулебякин ◽  
И.Е. Курицына ◽  
Е.Е. Ломонова ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Phase Composition ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Yttrium Oxide ◽  
Local Structure ◽  
Electrical Characteristics ◽  
Temperature Range

The temperature dependence of the thermal conductivity of cubic ZrO2 single crystals stabilized by yttrium oxide from 8 to 40 mol % was studied in the temperature range 50–300 K. The analysis of this dependence was carried out taking into account the phase composition, local structure features, and electrical characteristics of these single crystals.

scholarly journals EVOLUTION OF OVER-CONDUCTIVITY OF YВа2Сu3О7-δ SINGLE CRYSTALS UNDER THE EXPOSURE OF IRRADIATION BY HIGH-ENERGY ELECTRONS

2020 ◽  
pp. 9-15
Author(s):  
N.A. Azarenkov ◽  
V.N. Voyevodin ◽  
R.V. Vovk ◽  
N.R. Vovk ◽  
G.Ya. Khadzhai ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Electron Irradiation ◽  
Mean Field Theory ◽  
Mean Field ◽  
High Energy ◽  
Excess Conductivity ◽  
Crossover Point ◽  
Temperature Range ◽  
The Mean

The evolution of the excess conductivity of YВа2Сu3О7-δ single crystals upon electron irradiation is investigated. It was shown that electron irradiation leads to a significant expansion of the temperature range for the existence of excess conductivity, thereby narrowing the region of the linear dependence of ρ(Т) in the ab plane. It was found that the excess conductivity ∆σ(Т) of YВа2Сu3О7-δ single crystals in a wide temperature range Tf<Т<T* (Тf – the transition temperature from the PG to the FP mode) is subject to exponential temperature dependence. Moreover, the description of excess conductivity using the relation ∆σ ~ (1-Т/Т*)exp( ∆*ab/T) (Δ*ab – the pseudogap in ab-plane) can be interpreted in terms of the mean-field theory, where T* is presented as the mean-field temperature of the transition to the PG state, and the temperature dependence of the pseudogap is satisfactorily described in the framework of the BCS-BEC crossover theory. In this case, the value of the transverse coherence length ξс(0) increases 1.4 times and the 2D-3D crossover point shifts in temperature.

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