Temperature dependence of critical stress and phase diagram of ferroelastic Pb3 (PO4)2 Pb3 (VO4)2

1977 ◽  
Vol 12 (11) ◽  
pp. 1029-1034 ◽  
Author(s):  
R.v. Hodenberg ◽  
E. Salje
Keyword(s):  
Phase Diagram ◽  
Temperature Dependence ◽  
Critical Stress

Temperature dependence of critical stress for wall slip by debonding

2000 ◽  
Vol 94 (2-3) ◽  
pp. 151-157 ◽  
Author(s):  
Yogesh M Joshi ◽  
Prashant S Tapadia ◽  
Ashish K Lele ◽  
R.A Mashelkar
Keyword(s):  
Temperature Dependence ◽  
Critical Stress ◽  
Wall Slip

Iron-based superelastic alloys with near-constant critical stress temperature dependence

Science ◽  
2020 ◽  
Vol 369 (6505) ◽  
pp. 855-858 ◽  
Author(s):  
Ji Xia ◽  
Yuki Noguchi ◽  
Xiao Xu ◽  
Takumi Odaira ◽  
Yuta Kimura ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Temperature Dependence ◽  
Critical Stress ◽  
Outer Space ◽  
Alloy System ◽  
Large Temperature ◽  
Superelastic Behavior ◽  
Iron Based ◽  
Metal Shape

Shape memory alloys recover their original shape after deformation, making them useful for a variety of specialized applications. Superelastic behavior begins at the critical stress, which tends to increase with increasing temperature for metal shape memory alloys. Temperature dependence is a common feature that often restricts the use of metal shape memory alloys in applications. We discovered an iron-based superelastic alloy system in which the critical stress can be optimized. Our Fe-Mn-Al-Cr-Ni alloys have a controllable temperature dependence that goes from positive to negative, depending on the chromium content. This phenomenon includes a temperature-invariant stress dependence. This behavior is highly desirable for a range of outer space–based and other applications that involve large temperature fluctuations.

Anomalous temperature dependence of the μ+ Knight shift and the phase diagram of UPd3

2000 ◽  
Vol 289-290 ◽  
pp. 311-315 ◽  
Author(s):  
A Schenck ◽  
D Andreica ◽  
F.N Gygax ◽  
M Pinkpank ◽  
K.A McEwen ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Temperature Dependence ◽  
Knight Shift ◽  
Anomalous Temperature Dependence ◽  
Anomalous Temperature

scholarly journals Temperature Dependence of Dielectric Properties of Ferroelectric Heterostructures with Domain-Provided Negative Capacitance

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 75
Author(s):  
Maksim A. Pavlenko ◽  
Yuri A. Tikhonov ◽  
Anna G. Razumnaya ◽  
Valerii M. Vinokur ◽  
Igor A. Lukyanchuk
Keyword(s):  
Phase Diagram ◽  
Dielectric Properties ◽  
Temperature Dependence ◽  
Energy Efficient ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Negative Capacitance ◽  
Temperature Dependent ◽  
Domain Structures ◽  
Temperature Dependent Properties

It is well known that the ferroelectric layers in dielectric/ferroelectric/dielectric heterostructures harbor polarization domains resulting in the negative capacitance crucial for manufacturing energy-efficient field-effect transistors. However, the temperature behavior of the characteristic dielectric properties, and, hence, the corresponding behavior of the negative capacitance, are still poorly understood, restraining the technological progress thereof. Here we investigate the temperature-dependent properties of domain structures in the SrTiO3/PbTiO3/SrTiO3 heterostructures and demonstrate that the temperature–thickness phase diagram of the system includes the ferroelectric and paraelectric regions, which exhibit different responses to the applied electric field. Using phase-field modeling and analytical calculations we find the temperature dependence of the dielectric constant of ferroelectric layers and identify the regions of the phase diagram wherein the system demonstrates negative capacitance. We further discuss the optimal routes for implementing negative capacitance in energy-efficient ferroelectric field-effect transistors.

Prospects for producing hydrogen-ammonia fuel using lithium-aluminum amide

2021 ◽  
Vol 64 (1) ◽  
pp. 78-89
Author(s):  
D.V. Schur ◽  
◽  
S.Yu. Zaginainchenko ◽  
Afer Veziroglu ◽  
T.N. Veziroglu ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Transformation ◽  
Statistical Theory ◽  
Equilibrium State ◽  
Temperature Dependence ◽  
Hydrogen Concentration ◽  
Lithium Aluminum ◽  
Free Energies ◽  
Thermodynamic Equilibrium State ◽  
Pressure Hydrogen

A statistical theory of the phase transformation of lithium aluminum amide with the release of ammonia is developed. The free energies of the phases are calculated, their dependence on temperature, pressure, hydrogen concentration and energy parameters is established. The phase diagram is built. The equations of the thermodynamic equilibrium state are calculated. Investigated isoprocesses in phases. The coefficients of rectangularity and uniformity of isotherms are obtained. A feature of the temperature dependence of the concentration of hydrogen in phases is established.

Temperature dependence of the phase diagram of Cl/Ag(100)

1988 ◽  
Vol 37 (10) ◽  
pp. 5870-5873 ◽  
Author(s):  
R. Q. Hwang ◽  
E. D. Williams ◽  
N. C. Bartelt ◽  
R. L. Park
Keyword(s):  
Phase Diagram ◽  
Temperature Dependence

Investigation of the elastic properties of UNI2Si2 as a function of temperature, magnetic field, and pressure

2003 ◽  
Vol 81 (6) ◽  
pp. 797-804 ◽  
Author(s):  
G Quirion ◽  
A Kelly ◽  
S Newbury ◽  
F S Razavi ◽  
J D Garrett
Keyword(s):  
Magnetic Field ◽  
Phase Diagram ◽  
Temperature Dependence ◽  
Elastic Properties ◽  
Magnetic Phase ◽  
Density Wave ◽  
Spin Density Wave ◽  
Magnetic Phase Diagram ◽  
75.40 Cx ◽  
62.20 Dc

It is now well-established that the strong anisotropy in the magnetic properties of the intermetallic compounds UT2Si2, where T stands for a transition metal, is responsible for their rich magnetic phase diagram. However, within that series of compounds, UNi2Si2 is one that shows an unusual sequence of magnetically ordered states. Thus, to better understand its unusual properties, we have investigated the elastic properties of UNi2Si2 as a function of temperature, magnetic field, and pressure. In all three magnetic phases, our measurements indicate that the sound-velocity temperature dependence is dominated by the magnetoelastic coupling. Moreover, the analysis of the temperature dependence for the incommensurate longitudinal spin-density wave phase is consistent with a critical exponent β = 0.38 ± 0.01. We also present the magnetic phase diagram for UNi2Si2 obtained at 0 and 8 kbar. Our investigation reveals that the triple-point coordinates (Tp, Hp) decrease with pressure at a rate of dTp/dP = –0.1 K/kbar and dHp/dP = –0.1 T/kbar, respectively. PACS Nos.: 75.30.kz, 62.20.Dc, 62.50.+p, 75.40.Cx

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