Extracting the dynamical effective interaction and competing order from an analysis of Raman spectra of the high-temperature La2−xSrxCuO4superconductor

2011 ◽  
Vol 84 (5) ◽  
Author(s):  
S. Caprara ◽  
C. Di Castro ◽  
B. Muschler ◽  
W. Prestel ◽  
R. Hackl ◽  
...  
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Effective Interaction ◽  
Competing Order

High-Temperature Raman Spectra of CO2 and H2O for Combustion Diagnostics

1981 ◽  
Vol 35 (6) ◽  
pp. 582-584 ◽  
Author(s):  
David A. Stephenson
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Partition Functions ◽  
Temperature Range ◽  
Combustion Diagnostics ◽  
Simple Models

The Raman spectra of CO2 and H2O have been measured from 1000 to 2200°K. The spectra are found to be well described by the simple models described previously. In particular, the simple partition functions of T−1 for CO2 and T−3/2 for H2O are adequate for describing the spectra over the temperature range of interest.

scholarly journals High temperature Raman spectra and micro-structure of Bi4Ge3O12 crystal and its melt

2007 ◽  
Vol 56 (2) ◽  
pp. 1152
Author(s):  
Zhang Xia ◽  
Wan Song-Ming ◽  
Zhang Qing-Li ◽  
Yin Shao-Tang ◽  
You Jing-Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Micro Structure

scholarly journals High temperature Raman spectra and micro-structure of KTN crystal and melt

2009 ◽  
Vol 58 (1) ◽  
pp. 570
Author(s):  
Zhou Wen-Ping ◽  
Wan Song-Ming ◽  
Yin Shao-Tang ◽  
Zhang Qing-Li ◽  
You Jing-Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Micro Structure

scholarly journals Temperature-Dependent Raman Spectroscopic Study of the Double Molybdate KBi(MoO4)2

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5453
Author(s):  
Min Wang ◽  
Changhao Wang ◽  
Jian Wang ◽  
Liming Lu ◽  
Xiaoye Gong ◽  
...  
Keyword(s):  
High Temperature ◽  
Raman Spectra ◽  
Monoclinic Phase ◽  
Raman Band ◽  
Vibrational Modes ◽  
Temperature Dependent ◽  
Raman Spectroscopic ◽  
Thermal Stability Of ◽  
Good Agreement

In situ high-temperature Raman spectra of polycrystalline KBi(MoO4)2 were recorded from room temperature to 1073 K. Thermal stability of the monoclinic KBi(MoO4)2 was examined by temperature-dependent XRD. The monoclinic phase transformed into the scheelite tetragonal structure at 833 K, and then to the monoclinic phase at 773 K. Quantum chemistry ab initio calculation was performed to simulate the Raman spectra of the structure of KBi(MoO4)2 high-temperature melt. The experimental Raman band at 1023 K was deconvoluted into seven Gaussian peaks, and the calculated results were in good agreement with the experimental data. Therefore, the vibrational modes of Raman peaks of molten KBi(MoO4)2 were assigned. It was confirmed that the isolated structure of [Bi(MoO4)2]− monomer, consisting of Mo6+ centers and Bi3+ sub-centers connected by edge-sharing, mainly exists in the melt of KBi(MoO4)2.

scholarly journals EQUATION OF STATE FOR DENSE SUPERNOVA MATTER

2009 ◽  
Vol 18 (08) ◽  
pp. 1205-1226 ◽  
Author(s):  
C. C. MOUSTAKIDIS
Keyword(s):  
High Temperature ◽  
Equation Of State ◽  
Nuclear Matter ◽  
Thermal Effects ◽  
Effective Interaction ◽  
Interaction Model ◽  
Decay Process ◽  
High Density ◽  
Β Decay ◽  
Charge Neutrality

We provide an equation of state for high density supernova matter by applying a momentum-dependent effective interaction. We focus on the study of the equation of state of high density and high temperature nuclear matter containing leptons (electrons and neutrinos) under the chemical equilibrium condition. The conditions of charge neutrality and equilibrium under the β-decay process lead first to the evaluation of the lepton fractions and afterward to the evaluation of internal energy, pressure, entropy and, in total to the equation of state of hot nuclear matter for various isothermal cases. Thermal effects on the properties and equation of state of nuclear matter are evaluated and analyzed in the framework of the proposed effective interaction model. Since supernova matter is characterized by a constant entropy, we also present the thermodynamic properties for the isentropic case. Special attention is devoted to the study of the contribution of the components of β-stable nuclear matter to the entropy per particle, a quantity of great interest for the study of structure and collapse of supernovas.

scholarly journals Synthesis and Raman spectra of K-Ca double carbonates: K2Ca(CO3)2 bütschliite, fairchildite, and K2Ca2(CO3)3 at 1 ATM

2019 ◽  
Vol 64 (9) ◽  
pp. 967-973
Author(s):  
A. V. Arefiev ◽  
I. V. Podborodnikov ◽  
A. F. Shatskiy ◽  
K. D. Litasov
Keyword(s):  
Raman Spectroscopy ◽  
Raman Spectrum ◽  
High Temperature ◽  
Solid State ◽  
Raman Spectra ◽  
Solid State Reaction ◽  
Atmospheric Pressure ◽  
Intense Band ◽  
Temperature Modification ◽  
High Temperature Modification

Here we present results on synthesis of double K-Ca carbonates at atmospheric pressure in closed graphite capsules. The mixtures of K2CO3 and CaCO3 corresponding to stoichiometry of K2Ca(CO3)2 and K2Ca2(CO3)3 were used as starting materials. The low-temperature modification of K2Ca(CO3)2 was synthesized by a solid-state reaction at 500°C during 96 h. The high-temperature modification of K2Ca(CO3)2 as well as the K2Ca2(CO3)3 compound were synthesized both by a solid-state reaction at 600°C during 72 h and during cooling of the melt from 830 to 650°C for 30 min. The obtained carbonates were studied by Raman spectroscopy. The Raman spectrum of bütschliite is characterized by the presence of an intense band at 1093 cm-1 and several bands at 1402, 883, 826, 640, 694, 225, 167 and 68 сm-1. The Raman spectrum of fairchildite has characteristic intense bands at 1077 and 1063 cm-1, and several bands at 1760, 1739, 719, 704, 167, 100 сm-1. In the Raman spectrum of K2Ca2(СO3)3 intense bands at 1078 and 1076 cm-1 and several bands at 1765, 1763, 1487, 1470, 1455, 1435, 1402, 711, 705, 234, 221, 167, 125 and 101 сm-1 were found. The collected Raman spectra can be used to identify carbonate phases entrapped as microinclusions in phenocrysts and xenoliths from kimberlites and other alkaline rocks.

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