scholarly journals Changes of Vibrational Modes Upon Melting CsHgCl3, Cs2HgCl4 and Cs3HgCl5 Solids and Raman Spectra of HgCl2-ACl (A = Li, Na, K, Cs) Molten Salt Mixtures

1994 ◽  
Vol 1994-13 (1) ◽  
pp. 242-249
Author(s):  
G.A. Voyiatzis
Keyword(s):  
Molten Salt ◽  
Raman Spectra ◽  
Vibrational Modes ◽  
Salt Mixtures

scholarly journals Phonons in Short-Period GaN/AlN Superlattices: Group-Theoretical Analysis, Ab initio Calculations, and Raman Spectra

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 286
Author(s):  
Valery Davydov ◽  
Evgenii Roginskii ◽  
Yuri Kitaev ◽  
Alexander Smirnov ◽  
Ilya Eliseyev ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Raman Spectra ◽  
Density Functional ◽  
Structural Characteristics ◽  
Vibrational Modes ◽  
Phonon Modes ◽  
Short Period ◽  
Group Theoretical Analysis

We report the results of experimental and theoretical studies of phonon modes in GaN/AlN superlattices (SLs) with a period of several atomic layers, grown by submonolayer digital plasma-assisted molecular-beam epitaxy, which have a great potential for use in quantum and stress engineering. Using detailed group-theoretical analysis, the genesis of the SL vibrational modes from the modes of bulk AlN and GaN crystals is established. Ab initio calculations in the framework of the density functional theory, aimed at studying the phonon states, are performed for SLs with both equal and unequal layer thicknesses. The frequencies of the vibrational modes are calculated, and atomic displacement patterns are obtained. Raman spectra are calculated and compared with the experimental ones. The results of the ab initio calculations are in good agreement with the experimental Raman spectra and the results of the group-theoretical analysis. As a result of comprehensive studies, the correlations between the parameters of acoustic and optical phonons and the structure of SLs are obtained. This opens up new possibilities for the analysis of the structural characteristics of short-period GaN/AlN SLs using Raman spectroscopy. The results obtained can be used to optimize the growth technologies aimed to form structurally perfect short-period GaN/AlN SLs.

On the Electrochemical Thermodynamics of Minor Components in Molten Salt Mixtures

2021 ◽  
Vol 168 (2) ◽  
pp. 026502
Author(s):  
R. L. Fitzhugh ◽  
A. D. Clark ◽  
S. D. Nickerson ◽  
M. J. Memmott ◽  
J. N. Harb
Keyword(s):  
Molten Salt ◽  
Minor Components ◽  
Salt Mixtures ◽  
Electrochemical Thermodynamics

ChemInform Abstract: THE THERMAL EMF. OF ALKALI METAL-MOLTEN SALT MIXTURES

1977 ◽  
Vol 8 (48) ◽  
pp. no-no
Author(s):  
K. E. JOHNSON ◽  
S. J. SIME
Keyword(s):  
Alkali Metal ◽  
Molten Salt ◽  
Thermal Emf ◽  
Salt Mixtures

scholarly journals Anomalous Increase in Specific Heat of Binary Molten Salt-Based Graphite Nanofluids for Thermal Energy Storage

2018 ◽  
Vol 8 (8) ◽  
pp. 1305 ◽  
Author(s):  
Hyun Kim ◽  
Byeongnam Jo
Keyword(s):  
Specific Heat ◽  
Molten Salt ◽  
Base Fluid ◽  
Solid Phase ◽  
Layer Structure ◽  
Synthesis Process ◽  
Nanoparticle Concentration ◽  
Anomalous Increase ◽  
Salt Mixtures ◽  
Graphite Nanoparticles

An anomalous increase of the specific heat was experimentally observed in molten salt nanofluids using a differential scanning calorimeter. Binary carbonate molten salt mixtures were used as a base fluid, and the base salts were doped with graphite nanoparticles. Specific heat measurements of the nanofluids were performed to examine the effects of the composition of two salts consisting of the base fluid. In addition, the effect of the nanoparticle concentration was investigated as the concentration of the graphite nanoparticles was varied from 0.025 to 1.0 wt %. Moreover, the dispersion homogeneity of the nanoparticles was explored by increasing amount of surfactant in the synthesis process of the molten salt nanofluids. The results showed that the specific heat of the nanofluid was enhanced by more than 30% in the liquid phase and by more than 36% in the solid phase at a nanoparticle concentration of 1 wt %. It was also observed that the concentration and the dispersion homogeneity of nanoparticles favorably affected the specific heat enhancement of the molten salt nanofluids. The dispersion status of graphite nanoparticles into the salt mixtures was visualized via scanning electron microscopy. The experimental results were explained according to the nanoparticle-induced compressed liquid layer structure of the molten salts.

scholarly journals Surface behavior of low-temperature molten salt mixtures during the transition from liquid to solid

2019 ◽  
Vol 275 ◽  
pp. 290-296 ◽  
Author(s):  
Radha G. Bhuin ◽  
Patrick Schreiber ◽  
Bettina S.J. Heller ◽  
Marlene Scheuermeyer ◽  
Peter Wasserscheid ◽  
...  
Keyword(s):  
Low Temperature ◽  
Molten Salt ◽  
Surface Behavior ◽  
Salt Mixtures

Hot corrosion of different alloys in chloride and carbonate molten-salt mixtures under argon atmosphere

Solar Energy ◽  
2019 ◽  
Vol 189 ◽  
pp. 254-267 ◽  
Author(s):  
Xiaoru Zhuang ◽  
Wenrui Liu ◽  
Xinhai Xu
Keyword(s):  
Molten Salt ◽  
Hot Corrosion ◽  
Argon Atmosphere ◽  
Salt Mixtures

Identification of Vibrational Modes in BaSi2 Epitaxial Films by Infrared and Raman Spectroscopy

2018 ◽  
Vol 386 ◽  
pp. 43-47 ◽  
Author(s):  
Hirofumi Hoshida ◽  
Naoki Murakoso ◽  
Takashi Suemasu ◽  
Yoshikazu Terai
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectra ◽  
Epitaxial Films ◽  
Ir Absorption ◽  
Vibrational Modes ◽  
Depolarization Ratio ◽  
Phonon Line ◽  
Infrared And Raman Spectroscopy ◽  
Raman Intensities ◽  
Polarized Raman

Infrared (IR) absorption and polarized Raman spectra were measured in BaSi2 epitaxial films to investigate the vibrational modes and the symmetry of Si4 cluster in BaSi2. By an analysis based on Raman and/or IR activity in the spectra, the symmetry of Si4 cluster was determined as Th-symmetry and the observed Raman lines and IR peaks were assigned to Ag, Eg, Fg, and Fu, respectively. In the three Raman lines of Fg-mode, one LO phonon line and two TO phonon lines were classified by the depolarization ratio of polarized Raman intensities.

scholarly journals Ionen-und Molekülbeweglichkeiten in einfachen binären Salzschmelzen / Ionic and Molecular Mobilities in Simple Binary Molten Salt Mixtures

1976 ◽  
Vol 31 (11) ◽  
pp. 1436-1442 ◽  
Author(s):  
Joachim Richter
Keyword(s):  
Molten Salt ◽  
The Self ◽  
Self Diffusion ◽  
Salt Mixtures ◽  
Ionic Mobilities

Abstract For additive binary molten salt mixtures the ionic mobilities, the interdiffusion mobility and the self diffusion mobilities are defined. Values of these mobilities are given for the system NaNO3+AgNO3 at 290 °C in dependence of the composition.

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