Electro-caloric effect in a BCZT single crystal

CrystEngComm ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 1597-1602 ◽  
Author(s):  
Donglin Liu ◽  
Qiang Li ◽  
Qingfeng Yan
Keyword(s):  
Curie Temperature ◽  
Single Crystal ◽  
Wide Temperature Range ◽  
Temperature Range ◽  
Caloric Effect

The electro-caloric effect of the [001]-oriented (Ba,Ca)(Zr,Ti)O3 (BCZT) single crystal was investigated in a wide temperature range from −100 °C to Curie temperature (122 °C).

Elastic Constants in C-plane of Single Crystal Bi 2Sr 2Ca Cu 208 between 80 K and 260 K

1990 ◽  
Vol 193 ◽  
Author(s):  
Jin Wu ◽  
Yening Wang ◽  
Yifeng Yan ◽  
Zhongxian Zhao
Keyword(s):  
Shear Modulus ◽  
Single Crystal ◽  
Temperature Dependence ◽  
Elastic Constants ◽  
Wide Temperature Range ◽  
Sound Propagation ◽  
Anisotropic Elasticity ◽  
Ultrasonic Velocities ◽  
Temperature Range

ABSTRACTThe temperature dependence of the in-plane C11 C22. C12 and C66 modes between 80 and 260 K of superconducting crystals of Bi2Sr2Ca1Cu208 have been obtained via the measurements of ultrasonic-velocities. The anisotropic elasticity in the a-b plane of single crystal Bi2 Sr2Ca1Cu2O8 is manifest. The shear modulus of sound propagation along the [110] with the polarization has been also calculated and shows an overall trend of softening over a wide temperature range above Tc. The shear modulus C6 6 shows three obvious softening minima around 240–250 K, 150 K and 100 K.

Study on Thermal Hysteresis of Elastic Modulus in Granular Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O

1990 ◽  
Vol 195 ◽  
Author(s):  
Yening Wang ◽  
Linhai Sun ◽  
Jin Wu ◽  
Min Gu
Keyword(s):  
Elastic Modulus ◽  
Single Crystal ◽  
Pore Size ◽  
Wide Temperature Range ◽  
Thermal Hysteresis ◽  
Coarse Grained ◽  
First Order ◽  
Temperature Range

ABSTRACTA large thermal hysteresis ( > 100 K) of elastic modulus was measured for coarse grained Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O. Whereas, only a small thermal hysteresis (2∼3 K) near the velocity minima at 240 K, and 150 K was observed in Bi2 Sr2 CaCu2 O8 single crystal, which were found to be associated with phaselike transitions (PLT). The investigations of isothermal recovery of modulus for coarse grained YBCO and BSCCO disclose that the large thermal hysteresis may be attributed to the defects of pore size generated in the interconnecting region between grains as a result of PLT of weak first order but covering a wide temperature range. The mechanism of a large thermal hysteresis for coarse grained samples has been discussed in detail.

Features of the photoconductivity of the quasi-one-dimensional compound TiS3

2021 ◽  
Author(s):  
S.A. Nikonov ◽  
I.G. Gorlova ◽  
S.G. Zybtsev ◽  
V.Ya. Pokrovskii
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Wide Temperature Range ◽  
Direct Evidence ◽  
Nonlinear Conductivity ◽  
One Dimensional ◽  
Temperature Range ◽  
Near Ir ◽  
Linear And Nonlinear ◽  
Magnetic Conductivity

Problem formulating. The features of linear and nonlinear conductivity, magnetic conductivity, thermopower, and the Hall effect observed on TiS3 whiskers indicate phase transitions to a state of CDW in this compound, but there is no direct evidence yet. The study of photoconductivity would allow us to learn more about the nature of these phase transitions. Goal. Study of the effect of radiation in the range from near-IR to near-UV on the conductivity of single-crystal TiS3 whiskers at 4.2 <T<300 K and search for features of photoconductivity in the temperature range of the suggested phase transitions. Result. Features of the photoconductivity of TiS3 at temperatures of 50 K and 15 K, at which the −dlnσ/d(1/T) maxima were previously observed, are found. A decrease in photoconductivity at these temperatures indicates a change in the electronic spectrum, which may be associated with the formation of CDW. Practical meaning. In the case of developing TiS3-based photosensors, it is important to study the photoconductivity in a wide temperature range.

scholarly journals Thermal stimulated current response in cupric oxide single crystal thin films over a wide temperature range

2016 ◽  
Vol 50 (3) ◽  
pp. 035303
Author(s):  
Kungan Yang ◽  
Shuxiang Wu ◽  
Fengmei Yu ◽  
Wenqi Zhou ◽  
Yunjia Wang ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Wide Temperature Range ◽  
Cupric Oxide ◽  
Current Response ◽  
Temperature Range

The spontaneous magnetization of cobalt

1951 ◽  
Vol 207 (1091) ◽  
pp. 427-446 ◽  
Keyword(s):  
Heat Treatment ◽  
Curie Temperature ◽  
Single Crystal ◽  
Transformation Temperature ◽  
Equations Of State ◽  
Spontaneous Magnetization ◽  
Hexagonal Structure ◽  
Slow Cooling ◽  
Temperature Range ◽  
The Face

The paper describes how measurements of the spontaneous magnetization of pure specimens of single-crystal close-packed hexagonal and polycrystalline face-centred cubic cobalt have been made over the temperature range -183 to 1121° C. A single crystal of cobalt possessing a close-packed hexagonal structure was prepared by the process of slow cooling of the melt. Owing to the presence of a phase change in cobalt occurring c . 400° C when the metal changes from a close-packed hexagonal structure below 400° C to a face-centred cubic structure above 400° C, it was necessary to determine two critical rates of cooling to prepare a crystal. Magnetic test specimens of single-crystal cobalt, cut so that they were capable of being magnetized along the easy axis of magnetization (the hexagonal axis), and of polycrystalline cobalt, of approximate dimensions 4 x 2 x 2 mm., were studied using the magnetic balance devised by Sucksmith (1939). The spontaneous magnetization of the hexagonal form was accurately measured from — 183 to 431° C, this latter temperature being determined as the upper transformation temperature of the cobalt. Complete tables of these measurements are given. By extrapolation the value 162.5 5 was determined for the spontaneous magnetization of hexagonal cobalt at absolute zero of temperature. Measurements on the polycrystalline face-centred cubic material were made from 394° C (this temperature being determined as the lower transformation temperature) to the Curie temperature, determined by extrapolation to be 1121° C. The face-centred cubic material possessed greater magnetization than the hexagonal, and in the temperature range 431 to 950° C it was found to be dependent upon the heat treatment the specimen had received; the significant factor in this heat treatment being the speed with which the specimen was allowed to cool through the lower transformation temperature. The Curie temperature was not affected by this heat treatment. To determine the spontaneous magnetization at very high temperatures where no saturation was observed the extrapolation technique devised by Weiss & Forrer (1926) was used. This procedure is described. When reduced values of magnetization and temperature were calculated it was found that the hexagonal and face-centred cubic materials obeyed different reduced equations of state although excellent agreement was obtained when the reduced values for face-centred cubic cobalt were compared with similar values for nickel. These results given in detailed tabulated form show that the reduced magnetic equation of state is structure dependent.

Fibre-optic temperature sensor with wide temperature range characteristics

1987 ◽  
Vol 134 (5) ◽  
pp. 291 ◽  
Author(s):  
K.T.V. Grattan ◽  
J.D. Manwell ◽  
S.M.L. Sim ◽  
C.A. Willson
Keyword(s):  
Wide Temperature Range ◽  
Temperature Sensor ◽  
Fibre Optic ◽  
Temperature Range

Enabling highly reversible sodium metal cycling across a wide temperature range with dual-salt electrolytes

2021 ◽  
Author(s):  
Akila C. Thenuwara ◽  
Pralav P. Shetty ◽  
Neha Kondekar ◽  
Chuanlong Wang ◽  
Weiyang Li ◽  
...  
Keyword(s):  
Wide Temperature Range ◽  
High Energy ◽  
Liquid Electrolyte ◽  
Metal Cycling ◽  
Temperature Range ◽  
Sodium Metal ◽  
Wide Range

A new dual-salt liquid electrolyte is developed that enables the reversible operation of high-energy sodium-metal-based batteries over a wide range of temperatures down to −50 °C.

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