Temperature and Pressure Dependent Phase Transitions of β′-LiZr2(PO4)3Studied by Raman Spectroscopy

2016 ◽  
Vol 120 (12) ◽  
pp. 1971-1977 ◽  
Author(s):  
K. Kamali ◽  
T. R. Ravindran
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Temperature And Pressure

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.

Phase transitions in PbZr0.72Sn0.28O3 single crystals studied by Raman spectroscopy

2016 ◽  
Vol 89 (7-8) ◽  
pp. 768-776 ◽  
Author(s):  
Irena Jankowska-Sumara ◽  
Min-Seok Jeong ◽  
Jae-Hyeon Ko ◽  
Andrzej Majchrowski ◽  
Józef Żmija
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Single Crystals

Temperature- and pressure-induced phase transitions in cyclobutanol

2015 ◽  
Vol 1092 ◽  
pp. 89-95 ◽  
Author(s):  
Xuerui Cheng ◽  
Junyu Li ◽  
Liucheng Chen ◽  
Xiang Zhu ◽  
Chaosheng Yuan ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Temperature And Pressure

Pressure induced phase transitions of TTAB-micellar solutions studied by SANS and Raman spectroscopy

2006 ◽  
Vol 8 (8) ◽  
pp. 994-1000 ◽  
Author(s):  
C. R. Haramagatti ◽  
A. Islamov ◽  
H. Gibhardt ◽  
N. Gorski ◽  
A. Kuklin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Phase Transitions ◽  
Micellar Solutions

α-l-Glutamic acid under high pressure: Phase transitions studied by Raman spectroscopy

2016 ◽  
Vol 86 ◽  
pp. 343-349 ◽  
Author(s):  
C. Luz-Lima ◽  
J.A. Borges ◽  
J.V.B. Moura ◽  
G.S. Pinheiro ◽  
B.C. Viana ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Pressure ◽  
Phase Transitions ◽  
Glutamic Acid ◽  
High Pressure Phase ◽  
Pressure Phase
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