Hot aluminum substrate induced hexagonal‐tetragonal phase transitions in InSe and performance of Al/InSe/Cu 2 O pn tunneling devices

2020 ◽  
Vol 62 (12) ◽  
pp. 3848-3856
Author(s):  
Atef Fayez Qasrawi ◽  
Reham Reda Kmail
Keyword(s):  
Phase Transitions ◽  
Tetragonal Phase ◽  
Aluminum Substrate ◽  
And Performance ◽  
Tunneling Devices

scholarly journals Thickness-dependent electrocaloric effect in mixed-phase Pb 0.87 Ba 0.1 La 0.02 (Zr 0.6 Sn 0.33 Ti 0.07 )O 3 thin films

2016 ◽  
Vol 374 (2074) ◽  
pp. 20160056 ◽  
Author(s):  
T. M. Correia ◽  
Q. Zhang
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Phase Transitions ◽  
Film Thickness ◽  
Tetragonal Phase ◽  
Sol Gel ◽  
Breakdown Field ◽  
Electrocaloric Effect ◽  
Thickness Increase ◽  
Higher Temperature

Full-perovskite Pb 0.87 Ba 0.1 La 0.02 (Zr 0.6 Sn 0.33 Ti 0.07 )O 3 (PBLZST) thin films were fabricated by a sol–gel method. These revealed both rhombohedral and tetragonal phases, as opposed to the full-tetragonal phase previously reported in ceramics. The fractions of tetragonal and rhombohedral phases are found to be strongly dependent on film thickness. The fraction of tetragonal grains increases with increasing film thickness, as the substrate constraint throughout the film decreases with film thickness. The maximum of the dielectric constant ( ε m ) and the corresponding temperature ( T m ) are thickness-dependent and dictated by the fraction of rhombohedral and tetragonal phase, with ε m reaching a minimum at 400 nm and T m shifting to higher temperature with increasing thickness. With the thickness increase, the breakdown field decreases, but field-induced antiferroelectric–ferroelectric ( E AFE−FE ) and ferroelectric–antiferroelectric ( E FE−AFE ) switch fields increase. The electrocaloric effect increases with increasing film thickness. This article is part of the themed issue ‘Taking the temperature of phase transitions in cool materials’.

Raman Scattering Study of Cubic to Tetragonal Phase Transitions in Mixed SystemAxBa1-xTiO3

1996 ◽  
Vol 35 (Part 1, No. 9B) ◽  
pp. 5192-5195 ◽  
Author(s):  
Seiji Kojima ◽  
Yasuo Ikeuchi ◽  
Huang Zhunchang ◽  
Yin Qingrui
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Tetragonal Phase ◽  
Scattering Study

scholarly journals Raman scattering study of thePbZr1−xTixO3system: Rhombohedral-monoclinic-tetragonal phase transitions

2002 ◽  
Vol 66 (13) ◽  
Author(s):  
A. G. Souza Filho ◽  
K. C. V. Lima ◽  
A. P. Ayala ◽  
I. Guedes ◽  
P. T. C. Freire ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Tetragonal Phase ◽  
Scattering Study

Cubic to tetragonal phase transitions in(NH4)2PtBr6andRb2PtI6

1978 ◽  
Vol 18 (3) ◽  
pp. 1352-1355 ◽  
Author(s):  
Robert G. C. McElroy ◽  
Robin L. Armstrong
Keyword(s):  
Phase Transitions ◽  
Tetragonal Phase

Raman Scattering Study of Cubic to Tetragonal Phase Transitions of Ti-rich Pb(ZrxTi1-x)O3

1997 ◽  
Vol 36 (Part 1, No. 5B) ◽  
pp. 2985-2988 ◽  
Author(s):  
Yasuo Ikeuchi ◽  
Seiji Kojima ◽  
Takashi Yamamoto
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Tetragonal Phase ◽  
Scattering Study

X-ray diffractometer for the investigation of temperature- and magnetic field-induced structural phase transitions

2018 ◽  
Vol 51 (3) ◽  
pp. 761-767 ◽  
Author(s):  
Tom Faske ◽  
Wolfgang Donner
Keyword(s):  
Phase Transitions ◽  
Energy Resolution ◽  
Structural Phase ◽  
High Energy ◽  
High Energy Resolution ◽  
Photon Flux ◽  
Structural Phase Transitions ◽  
X Ray ◽  
And Performance

This article reports the development and characterization of a laboratory-based high-resolution X-ray powder diffractometer equipped with a 5.5 T magnet and closed-cycle helium cryostat that is primarily designed for the investigation of magneto-structural phase transitions. Unique features of the diffractometer include the position-sensitive detector, allowing the collection of an entire diffraction pattern at once, and the high energy resolution with Mo Kα 1 radiation. The ability to utilize a lower energy resolution but higher photon flux by switching to an X-ray mirror monochromator makes it a versatile setup for a variety of compounds. In this contribution, details of the design and performance of the instrument are presented along with its specifications.

Cubic-tetragonal phase transitions in high resistivity BaTiO3 single crystals

1969 ◽  
Vol 2 (8) ◽  
pp. 1168-1170 ◽  
Author(s):  
T J Parker ◽  
J C Burfoot
Keyword(s):  
Phase Transitions ◽  
Single Crystals ◽  
Tetragonal Phase ◽  
High Resistivity

Phase Transitions in the BIMEVOX Solid Solutions with Me = Ga, Zr

2008 ◽  
Vol 587-588 ◽  
pp. 114-117 ◽  
Author(s):  
V.V. Murasheva ◽  
Elena A. Fortalnova ◽  
Ekaterina D. Politova ◽  
Marina G. Safronenko ◽  
Sergei Yu. Stefanovich ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Solid Solutions ◽  
Phase Stability ◽  
Tetragonal Phase ◽  
Room Temperature ◽  
Β Phase ◽  
Α Phase ◽  
Phase Transition Temperatures ◽  
Stability Ranges

The polymorph phase stability ranges have been studied for the Bi4V2-xMexO11-y solid solutions with Me = Ga and Zr at room temperature. The formation of orthorhombic α- (x = 0.0 and 0.05) and β-phases (x = 0.1, 0.15) and tetragonal phase (0.2 ≤ x ≤ 0.3) has been revealed in BIGAVOX solid solutions. In BIZRVOX solid solutions, α-phase exists at x ≤ 0.05, while β-phase exists at 0.1 ≤ x ≤ 0.3. The second order phase transitions at ~ 308°C (BIGAVOX) and ~ 270°C (BIZRVOX) have been revealed for solid solutions with x = 0.05 using the SHG and DSC methods. In both systems, the β↔γ-phase transition temperatures have been found to decrease with increasing x.

scholarly journals Thermal Expansion and Magnetostriction of Laves-Phase Alloys: Fingerprints of Ferrimagnetic Phase Transitions

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1755 ◽  
Author(s):  
Chao Zhou ◽  
Huixin Bao ◽  
Yoshitaka Matsushita ◽  
Tieyan Chang ◽  
Kaiyun Chen ◽  
...  
Keyword(s):  
Phase Transition ◽  
Thermal Expansion ◽  
Phase Transitions ◽  
Tetragonal Phase ◽  
Magnetic Phase ◽  
Coupling Effect ◽  
Rhombohedral Phase ◽  
Laves Phase ◽  
Elastic Coupling ◽  
New Perspective

The magneto–elastic coupling effect correlates to the changes of moment and lattice upon magnetic phase transition. Here, we report that, in the pseudo-binary Laves-phase Tb1-xDyxCo2 system (x = 0.0, 0.7, and 1.0), thermal expansion and magnetostriction can probe the ferrimagnetic transitions from cubic to rhombohedral phase (in TbCo2), from cubic to tetragonal phase (in DyCo2), and from cubic to rhombohedral then to tetragonal phase (in Tb0.3Dy0.7Co2). Furthermore, a Landau polynomial approach is employed to qualitatively investigate the thermal expansion upon the paramagnetic (cubic) to ferrimagnetic (rhombohedral or tetragonal) transition, and the calculated thermal expansion curves agree with the experimental curves. Our work illustrates the correlation between crystal symmetry, magnetostriction, and thermal expansion in ferrimagnetic Laves-phase alloys and provides a new perspective to investigate ferrimagnetic transitions.

Sign in / Sign up

Export Citation Format

Share Document