Amorphous to crystalline phase transformation and growth of thin Te‐Se films

1982 ◽  
Vol 53 (10) ◽  
pp. 6809-6816 ◽  
Author(s):  
J. S. Vermaak ◽  
J. Petruzzello
Keyword(s):  
Phase Transformation ◽  
Crystalline Phase

Pyridinium salt with crystalline phase transformation under water vapor and reversible mechanochromism luminescent property

2021 ◽  
Author(s):  
Yi Chen ◽  
Xiaoning Li ◽  
Weilong Chi ◽  
Liangjing Tu ◽  
Yujun Xie ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Water Vapor ◽  
Crystalline Phase ◽  
Luminescent Property ◽  
Pyridinium Salt ◽  
Photophysical Property ◽  
Pyridine Derivative ◽  
Molecular Configuration

Photophysical property of organic aggregate is heavily affected by molecular configuration and intermolecular packing modes. Herein, organic pyridinium salt is synthesized by quaternization of pyridine derivative, and the resultant CPBBr...

Crystalline phase transformation of colloidal cadmium sulfide nanocrystals

2017 ◽  
Vol 31 (06) ◽  
pp. 1750037
Author(s):  
M. Ghali ◽  
A. M. Eissa ◽  
M. M. Mosaad
Keyword(s):  
Phase Transformation ◽  
Optical Absorption ◽  
Crystalline Phase ◽  
Growth Conditions ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Solution Ph ◽  
X Ray ◽  
Ph Values ◽  
Transmission Electron

In this paper, we give a microscopic view concerning influence of the growth conditions on the physical properties of nanocrystals (NCs) thin films made of CdS, prepared using chemical bath deposition CBD technique. We show a crystalline phase transformation of CdS NCs from hexagonal wurtzite (W) structure to cubic zincblende (ZB) when the growth conditions change, particularly the solution pH values. This effect was confirmed using X-ray diffraction (XRD), transmission electron microscopy (TEM), optical absorption and photoluminescence (PL) measurements. The optical absorption spectra allow calculation of the bandgap value, [Formula: see text], where significant increase [Formula: see text]200 meV in the CdS bandgap when transforming from Hexagonal to Cubic phase was found.

Analysis of the crystalline phase transformation of poly(vinylidene fluoride)

1985 ◽  
Vol 18 (12) ◽  
pp. 2583-2587 ◽  
Author(s):  
S. L. Hsu ◽  
F. J. Lu ◽  
D. A. Waldman ◽  
M. Muthukumar
Keyword(s):  
Phase Transformation ◽  
Crystalline Phase ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride

Amorphous to crystalline phase transformation and band gap refinement in ZnSe thin films

2018 ◽  
Vol 648 ◽  
pp. 31-38 ◽  
Author(s):  
M. Imran ◽  
Abida Saleem ◽  
Nawazish A. Khan ◽  
A.A. Khurram ◽  
Nasir Mehmood
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Band Gap ◽  
Crystalline Phase ◽  
Znse Thin Films

Amorphous-crystalline phase transformation of supported aggregates produced by indium deposition

1990 ◽  
Vol 191 (1) ◽  
pp. 127-133 ◽  
Author(s):  
M. Treilleux ◽  
G. Fuchs ◽  
F. Santos Aires ◽  
P. Melinon ◽  
A. Hoareau ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Crystalline Phase

Laser-Induced Phase Transformation of Sb-Te Alloy Films for Optical Storage

1988 ◽  
Vol 100 ◽  
Author(s):  
Susumu Fujimori ◽  
Shogo Yagi ◽  
Hiroki Yamazaki ◽  
Nobuhiro Funakoshi
Keyword(s):  
Phase Transformation ◽  
Phase Change ◽  
Phase Transformations ◽  
Crystalline Phase ◽  
Optical Storage ◽  
Optical Recording ◽  
Alloy Films

ABSTRACTSb-Te alloy films are developed as rewritable optical recording materials based on amorphous-crystalline phase transformations. Sb2 Te3 is shown to be the best practical phase change medium.

scholarly journals Systematic Structural and Optical Characterization of TiO2 Nanofibres Synthesised by Electrospinning

2021 ◽  
Vol 12 ◽  
pp. 106-115
Author(s):  
Oscar Secundino-Sánchez ◽  
José F. Sánchez-Ramírez ◽  
Joel Diaz-Reyes
Keyword(s):  
Phase Transformation ◽  
High Temperatures ◽  
Crystalline Phase ◽  
Annealing Temperature ◽  
Band Gap Energy ◽  
Continuous Change ◽  
Electrospinning Technique ◽  
Average Grain Size ◽  
High Resolution Tem ◽  
Tem Microscopy

TiO2 nanofibres were synthesised by means of the electrospinning technique, which were annealed at high temperatures to achieve the crystalline phase transformation. The chemical stoichiometry of electrospun TiO2 nanofibres was estimated by EDS, finding that at low annealing temperatures excess of oxygen was detected and at high temperatures excess of titanium that originates oxygen vacancies. TEM images show clearly the formation of TiO2 nanofibres that exhibit a homogeneous and continuous aspect without the presence of crystalline defects, whose surface morphology depends strongly on the annealing temperature. The crystalline phase transformation was studied by Raman spectroscopy, which revealed that annealed TiO2 nanofibres showed a crystalline phase transformation from pure anatase to, first a mix of anatase-rutile, then pure rutile as the annealing temperature increased, which was corroborated by X-ray diffraction and high-resolution TEM microscopy. The average grain size, inside the nanofibres, increased with the crystalline phase transformation from 10 to 24 nm for anatase-TiO2 and from 30 to 47 nm for rutile-TiO2, estimated by using the Scherrer-Debye equation. The band gap energy (Eg), obtained from optical absorption spectra, decreases monotonically, where a local minimum is observed at 700 °C, which is ranged in 3.75  Eg  2.42 eV, caused by the anatase → rutile crystalline phase transformation. The photoluminescence shows that radiative bands present a gradual red-shift as the annealing temperature increases due to the continuous change of Eg.

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