scholarly journals Doping and phase transitions processes on semiconductors and vibrational properties in complex glasses: A theoretical and experimental investigation

2021 ◽  
Author(s):  
◽  
Eduardo de Oliveira Gomes
Keyword(s):  
Experimental Investigation ◽  
Phase Transitions ◽  
Vibrational Properties

Pseudopotential Calculations of Structural Properties of Solids

1985 ◽  
Vol 63 ◽  
Author(s):  
Marvin L. Cohen
Keyword(s):  
Phase Transitions ◽  
Structural Phase ◽  
Vibrational Properties ◽  
Structural Phase Transitions ◽  
Superconducting Properties ◽  
Lattice Constants ◽  
Pseudopotential Calculations ◽  
Pseudopotential Approach ◽  
Cohesive Energies

ABSTRACTThrough the development of a total energy pseudopotential approach, it has become possible to compute structural, electronic, and vibrational properties of solids using only the atomic numbers and atomic masses of the constituent atoms as input. The method has been applied to semiconductors, insulators, and metals; and agreement with experiment for most properties is usually within a few percent.Applications include the determination of lattice constants for specific structural phases, properties of structural phase transitions, cohesive energies, bulk moduli, lattice vibrational spectra, electron-lattice interaction parameters, and electronic and superconducting properties. A recent example is the prediction of superconductivity in highly condensed hexagonal silicon which was subsequently found experimentally.

Magnetic and crystallographic phase transitions in Dy p Gd 1- p VO 4

1984 ◽  
Vol 391 (1800) ◽  
pp. 85-107 ◽  
Keyword(s):  
Experimental Investigation ◽  
Thermal Expansion ◽  
Phase Transitions ◽  
Quadrupole Moment ◽  
Magnetic Phase ◽  
Phase Changes ◽  
Magnetic Phase Transitions ◽  
Compositional Dependence ◽  
Quadrupole Interactions ◽  
Pair Model

The compositional vanadate system Dy p Gd 1- p VO 4 (0 ≤ p ≤ 1) displays successive crystallographic and magnetic phase transitions below 14 K. An experimental investigation of these phase changes has been made with thermal expansion methods and Mössbauer spectroscopy. It is found that there is a surprising variation of the compositional dependence of the transition temperatures T D ( p ) and T N ( p ), which cannot be adequately explained by conventional pseudo-spin molecular field and pair model approximations. A detailed formalism has been developed that accounts for the observations in terms of a magneto-strictively induced quadrupole moment on the Gd 3+ ions in the mixed crsytal system and, concomitant quadrupole interactions between the Dy 3+ and Gd 3+ ions. The application of the formalism to the corresponding variation of T D ( p ) in the simple diluent system Dy p Y 1- p VO 4 (0 ≤ p ≤ 1) is also discussed.

Comparative studies of vibrational properties and phase transitions in perovskite‐like frameworks of [(C 3 H 7 ) 4 N][M(N(CN) 2 ) 3 ] with MMn, Co, Ni

2019 ◽  
Vol 50 (10) ◽  
pp. 1561-1571 ◽  
Author(s):  
Aneta Ciupa‐Litwa ◽  
Maciej Ptak ◽  
Jerzy Hanuza ◽  
Edyta Kucharska ◽  
Krzysztof Beć
Keyword(s):  
Phase Transitions ◽  
Comparative Studies ◽  
Vibrational Properties

Experimental Investigation of Microstructure and Phase Transitions in Ag-Cu-Zn Brazing Alloys

2018 ◽  
Vol 27 (4) ◽  
pp. 1570-1579 ◽  
Author(s):  
Stevan P. Dimitrijević ◽  
Dragan Manasijević ◽  
Željko Kamberović ◽  
Silvana B. Dimitrijević ◽  
Miodrag Mitrić ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Phase Transitions

Raman microspectroscopy of noncancerous and cancerous human breast tissues. Identification and phase transitions of linoleic and oleic acids by Raman low-temperature studies

The Analyst ◽  
2015 ◽  
Vol 140 (7) ◽  
pp. 2134-2143 ◽  
Author(s):  
Beata Brozek-Pluska ◽  
Monika Kopec ◽  
Jakub Surmacki ◽  
Halina Abramczyk
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Raman Microspectroscopy ◽  
Vibrational Properties ◽  
Human Breast ◽  
Temperature Range ◽  
Breast Tissues

We present the results of Raman studies in the temperature range of 293–77 K on vibrational properties of linoleic and oleic acids and Raman microspectroscopy of human breast tissues at room temperature.

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