Transmission electron microscopy and structural phase transitions in anion-deficient perovskite-based oxides

2004 ◽  
Vol 61 (1) ◽  
pp. 77-92 ◽  
Author(s):  
Joke Hadermann ◽  
Gustaaf Van Tendeloo ◽  
Artem M. Abakumov
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Transitions ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Transmission Electron

Indentation Crystallization and Phase Transformation of Amorphous Germanium

2005 ◽  
Vol 904 ◽  
Author(s):  
G. Patriarche ◽  
E. Le Bourhis ◽  
M.M. Khayyat ◽  
M.M. Chaudhri
Keyword(s):  
Phase Transitions ◽  
Opposite Effect ◽  
Structural Phase ◽  
Metallic Phase ◽  
Structural Phase Transitions ◽  
Amorphous Germanium ◽  
Crystalline Semiconductor ◽  
Transmission Electron ◽  
Diamond Indenter ◽  
Induced Crystallization

AbstractIt has been known for about 15 years that when a Vickers indenter is loaded on to a crystalline semiconductor, such as silicon, a semiconductor to metallic phase transition occurs during indenter loading and on removal of the indenter the material within the residual indentation becomes amorphous. Here we report on a completely opposite effect: when a Berkovich or Vickers diamond indenter is loaded on to a submicrometre thick film of amorphous germanium, it densifies, crystallizes and undergoes structural phase transitions. These observations are based on transmission electron microscopy and Raman scattering investigations. It has also been shown that the indentation-induced crystallization and phase transitions occur close to the indenter tip, where the plastic strains are the highest.

scholarly journals Time Resolved Phase Transitions via Dynamic Transmission Electron Microscopy

2007 ◽  
Author(s):  
B Reed ◽  
M Armstrong ◽  
K Blobaum ◽  
N Browning ◽  
A Burnham ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Phase Transitions ◽  
Time Resolved ◽  
Transmission Electron

HRTEM analysis on phase transitions in Bi-based superconductive oxides

1990 ◽  
Vol 48 (4) ◽  
pp. 22-23
Author(s):  
S. Horiuchi ◽  
K. Shoda ◽  
X.J. Wu ◽  
H. Nozaki ◽  
M. Tsutsumi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Phase Transitions ◽  
Structural Variation ◽  
Molten State ◽  
Critical Temperatures ◽  
Transmission Electron ◽  
Higher Temperature ◽  
Ice Water

It is known for the superconductors in a Bi-Sr-Ca-Cu-O system that there are three phases. Bi2Sr2CuOx, Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox, which are called for simplicity the (2201), (2212) and (2223) phases with the critical temperatures Tc at about 20, 85 and 110K respectively. Their crystal structures are closely related and the phase transition among them often occurs. When the specimen in the partially molten state was quenched to ice-water, it was composed of a Bi-rich, amorphous phase and impurity phases like Ca1−zSrzCuO2. On crystallization the former became the (2201) phase. On further heating at higher temperature firstly the (2212) phase and secondly the (2223) phase were obtained.In the present study the structural variation during the transition from the (2201) phase to the (2212) phase and further to the (2223) phase was clarified mainly by using a high-resolution transmission electron microscopy (IIRTEM). Thin specimens were prepared by ion-thinning method and observed by a 200kV TEM (JEM 2000EX). The mechanism of the phase transition was discussed from the structural viewpoint.

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