Analysis of the Temperature-Dependent Phonon Structure in Sodium Nitrite by Raman Spectroscopy

1972 ◽  
Vol 5 (1) ◽  
pp. 79-91 ◽  
Author(s):  
C. M. Hartwig ◽  
E. Wiener-Avnear ◽  
S. P. S. Porto
Keyword(s):  
Raman Spectroscopy ◽  
Sodium Nitrite ◽  
Temperature Dependent ◽  
Phonon Structure

On the nature of the phase transitions of aluminosilicate perrhenate sodalite

2020 ◽  
Vol 235 (6-7) ◽  
pp. 213-223
Author(s):  
Hilke Petersen ◽  
Lars Robben ◽  
Thorsten M. Gesing
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Decomposition Temperature ◽  
Second Phase ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Two Phase ◽  
Structure Property Relationships ◽  
Heat Capacity Measurements

AbstractThe temperature-dependent structure-property relationships of the aluminosilicate perrhenate sodalite |Na8(ReO4)2|[AlSiO4]6 (ReO4-SOD) were analysed via powder X-ray diffraction (PXRD), Raman spectroscopy and heat capacity measurements. ReO4-SOD shows two phase transitions in the investigated temperature range (13 K < T < 1480 K). The first one at 218.6(1) K is correlated to the transition of dynamically ordered $P\overline{4}3n$ (> 218.6(1 K) to a statically disordered (<218.6(1) K) SOD template in $P\overline{4}3n$. The loss of the dynamics of the template anion during cooling causes an increase of disorder, indicated by an unusual intensity decrease of the 011-reflection and an increase of the Re-O2 bond length with decreasing temperature. Additionally, Raman spectroscopy shows a distortion of the ReO4 anion. Upon heating the thermal expansion of the sodalite cage originated in the tilt-mechanism causes the second phase transition at 442(1) K resulting in a symmetry-increase from $P\overline{4}3n$ to $Pm\overline{3}n$, the structure with the sodalites full framework expansion. Noteworthy is the high decomposition temperature of 1320(10) K.

scholarly journals Temperature-dependent Raman spectroscopy inBaRuO3systems

2002 ◽  
Vol 65 (23) ◽  
Author(s):  
Y. S. Lee ◽  
T. W. Noh ◽  
J. H. Park ◽  
K.-B. Lee ◽  
G. Cao ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Temperature Dependent

scholarly journals Study of Thermometry in Two-Dimensional Sb2Te3 from Temperature-Dependent Raman Spectroscopy

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Manavendra P. Singh ◽  
Manab Mandal ◽  
K. Sethupathi ◽  
M. S. Ramachandra Rao ◽  
Pramoda K. Nayak
Keyword(s):  
Thermal Conductivity ◽  
Raman Spectroscopy ◽  
Temperature Coefficient ◽  
Heat Dissipation ◽  
Peak Position ◽  
Two Dimensional ◽  
Phonon Modes ◽  
Temperature Dependent ◽  
Excellent Candidate ◽  
High Figure

AbstractDiscovery of two-dimensional (2D) topological insulators (TIs) demonstrates tremendous potential in the field of thermoelectric since the last decade. Here, we have synthesized 2D TI, Sb2Te3 of various thicknesses in the range 65–400 nm using mechanical exfoliation and studied temperature coefficient in the range 100–300 K using micro-Raman spectroscopy. The temperature dependence of the peak position and line width of phonon modes have been analyzed to determine the temperature coefficient, which is found to be in the order of 10–2 cm−1/K, and it decreases with a decrease in Sb2Te3 thickness. Such low-temperature coefficient would favor to achieve a high figure of merit (ZT) and pave the way to use this material as an excellent candidate for thermoelectric materials. We have estimated the thermal conductivity of Sb2Te3 flake with the thickness of 115 nm supported on 300-nm SiO2/Si substrate which is found to be ~ 10 W/m–K. The slightly higher thermal conductivity value suggests that the supporting substrate significantly affects the heat dissipation of the Sb2Te3 flake.

Temperature-Dependent Vibrational Modes in Sodium Nitrite

1968 ◽  
Vol 174 (3) ◽  
pp. 946-952 ◽  
Author(s):  
M. K. Barnoski ◽  
J. M. Ballantyne
Keyword(s):  
Sodium Nitrite ◽  
Vibrational Modes ◽  
Temperature Dependent

The phonon scattering mechanism and its effect on temperature dependent thermal and thermoelectric properties of the silver nanowire

2022 ◽  
Author(s):  
Gui-Cang He ◽  
Lina Shi ◽  
Yilei Hua ◽  
Xiao-Li Zhu
Keyword(s):  
Thermoelectric Properties ◽  
Phonon Scattering ◽  
Silver Nanowire ◽  
Scattering Mechanism ◽  
Temperature Dependent ◽  
Scattering Mechanisms ◽  
Phonon Structure

In this work, the electron-phonon, the phonon-phonon, and phonon structure scattering mechanisms and the effect on the thermal and thermoelectric properties of the silver nanowire (AgNW) are investigated in temperature...

Temperature dependent Raman spectroscopy of a nematic liquid crystal compound 6CHBT

2019 ◽  
Vol 288 ◽  
pp. 111065
Author(s):  
Jwmwi Basumatary ◽  
Debraj Gangopadhyay ◽  
Aparna Nath ◽  
Thingujam Kiranmala Devi
Keyword(s):  
Raman Spectroscopy ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Temperature Dependent ◽  
Crystal Compound

Temperature-dependent Raman spectroscopy study in MoO3 nanoribbons

2012 ◽  
Vol 43 (10) ◽  
pp. 1407-1412 ◽  
Author(s):  
Jose V. Silveira ◽  
Luciana L. Vieira ◽  
Josue Mendes Filho ◽  
Antonio J. C. Sampaio ◽  
Oswaldo L. Alves ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Spectroscopy Study ◽  
Temperature Dependent
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