scholarly journals Structural Transformations in Ferroelectrics Discovered by Raman Spectroscopy

2018 ◽  
Author(s):  
Kai Jiang ◽  
Liping Xu ◽  
Jinzhong Zhang ◽  
Zhigao Hu ◽  
Junhao Chu
Keyword(s):  
Raman Spectroscopy ◽  
Structural Transformations

Monitoring surface transformations of metal carbodiimide water oxidation catalysts by operando XAS and Raman spectroscopy

2018 ◽  
Vol 47 (31) ◽  
pp. 10759-10766 ◽  
Author(s):  
Rafael J. Müller ◽  
Jinggang Lan ◽  
Karla Lienau ◽  
René Moré ◽  
C. A. Triana ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Water Oxidation ◽  
Electrode Surface ◽  
Structural Transformations ◽  
Oxidation Catalysts ◽  
Operando Xas

Chemical and structural transformations at the electrode surface of metal carbodiimides MNCN (M = Co, Ni, Mn, Cu), were studied by operando Raman and XAS spectroscopy during electrocatalytic water oxidation

Laser-induced structural transformations in MoO3 investigated by Raman spectroscopy

1998 ◽  
Vol 13 (4) ◽  
pp. 1033-1037 ◽  
Author(s):  
E. Haro-Poniatowski ◽  
C. Julien ◽  
B. Pecquenard ◽  
J. Livage ◽  
M. A. Camacho-López
Keyword(s):  
Raman Spectroscopy ◽  
High Temperature ◽  
Low Temperature ◽  
Laser Irradiation ◽  
Data Storage ◽  
Glass Phase ◽  
Structural Transformations ◽  
Storage Medium ◽  
Irradiation Power ◽  
Power Densities

The glass-crystalline transformation induced by laser irradiation is studied in MoO3. Before crystallization we have found that the system evolves from a low temperature glass phase to a high temperature glass phase. The crystallization kinetics depend strongly on the initial irradiation power. The power densities needed to induce the phase transformations, of the order of 15 W/mm2, are relatively low and suggest the possibility of using this material as a data storage medium.

Pressure induced structural transformations of anatase TiO2 nanotubes probed by Raman spectroscopy and synchrotron X-ray diffraction

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 76142-76150 ◽  
Author(s):  
Zhaohui Dong ◽  
Fengping Xiao ◽  
Ankang Zhao ◽  
Lijia Liu ◽  
Tsun-Kong Sham ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Tio2 Nanotubes ◽  
Structural Transformations ◽  
Anatase Tio2 ◽  
X Ray Diffraction ◽  
X Ray

Pressure-induced transformations of anatase TiO2 nanotubes probed by in situ Raman spectroscopy and synchrotron X-ray diffraction reveal novel compression behaviors.

scholarly journals Transition of ZnZrF6·4H2O to ZnZrF6·5H2O and patterns of structural transformations

2020 ◽  
pp. 61-69
Author(s):  
Н.А. ДИДЕНКО ◽  
Е.И. ВОЙТ ◽  
К.А. САЯНКИНА
Keyword(s):  
Raman Spectroscopy ◽  
High Water ◽  
Structural Transformations ◽  
Crystalline Hydrate ◽  
Moist Air ◽  
Compound A ◽  
Structural Distortions ◽  
Starting Compound ◽  
Water Vapors ◽  
Two Stages

Изучено взаимодействие кристаллогидрата ZnZrF6∙4H2O с парами воды из воздуха методами КР-спектроскопии и РФА. Показано, что соединение ZnZrF6∙4H2O при 22–23 °С неустойчиво в атмосфере влажного воздуха (ρH2O = 0,73–0,84 кПа). Установлено, что в указанных условиях переход ZnZrF6∙4H2O → ZnZrF6·5H2O происходит в две стадии. Вначале исходное соединение адсорбирует воду и образуется гидрат ZnZrF6·6H2O. Далее гексагидрат довольно быстро «выветривается» до ZnZrF6·5H2O, что обусловлено наличием структурных искажений и дефектов кристаллической решетки высоководного соединения. Предложен возможный механизм структурных трансформаций при переходах ZnZrF6∙4H2O → ZnZrF6·6H2O → ZnZrF6·5H2O. Interaction of crystalline hydrate of ZnZrF6∙4H2O with water vapors from the air was studied by methods of Raman spectroscopy and XRD. It is shown that the compound ZnZrF6∙4H2O at 22–23 °C is unstable in the atmosphere of moist air (ρH2O = 0.73–0.84 kPa). It has been found that under these conditions the transition of ZnZrF6∙4H2O → ZnZrF6∙5H2O takes place in two stages. At first, the starting compound adsorbs water and forms the hydrate ZnZrF6∙6H2O. And then the hexahydrate dehydrates rather quickly to ZnZrF6∙5H2O, due to the presence of structural distortions and defects in the crystal lattice of the high-water compound. A possible mechanism of structural transformations during ZnZrF6∙4H2O → ZnZrF6∙6H2O → ZnZrF6∙5H2O transitions is proposed.

THE ROLE OF INTERMEDIATE CALCIUM ALUMINATE PHASES IN SOLID STATE SYNTHESIS OF MAYENITE (Ca12Al14O33)

2011 ◽  
Vol 04 (02) ◽  
pp. 183-186 ◽  
Author(s):  
M. RUSZAK ◽  
S. WITKOWSKI ◽  
P. PIETRZYK ◽  
A. KOTARBA ◽  
Z. SOJKA
Keyword(s):  
Raman Spectroscopy ◽  
Solid State ◽  
Low Temperature ◽  
Calcium Aluminate ◽  
Solid State Reaction ◽  
Rietveld Analysis ◽  
Structural Transformations ◽  
Solid State Synthesis

Structural transformations during the synthesis of mayenite ( Ca 12 Al 14 O 33) were investigated. The samples were prepared by a solid–state reaction and the transformations were researched by means of XRD, Rietveld analysis, SEM, and Raman spectroscopy. The three key phases ( CaAl 2 O 4, Ca 3 Al 2 O 6, Ca 5 Al 6 O 14) were identified and their role in the mayenite formation was assigned. The optimal low temperature pathway of the mayenite synthesis involving Ca 5 Al 6 O 14 intermediate was proposed.

Raman Spectroscopy Study of Pulsed Laser Induced Structural Transformations in Amorphous Ge Films

1995 ◽  
Vol 397 ◽  
Author(s):  
C. García ◽  
A.C. Prieto ◽  
J. Jiménez ◽  
J. Siegel ◽  
J. Solís ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Crystallization Process ◽  
Bond Angle ◽  
Pulsed Laser ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Structural Transformations ◽  
Spectroscopy Study ◽  
Glass Substrates ◽  
Average Bond

ABSTRACTStructural transformations induced in amorphous Ge films by picosecond laser pulses are studied by means of Raman spectroscopy and their dependence on parameters like the pulse fluence or the thermal conductivity of the substrate are analyzed. A correlation length model is used for studying the crystallization process, while the average bond angle distortion is used for determining the state of relaxation of the amorphous phase. Silicon and glass substrates are compared.

Further insights into the structural transformations in PbBi4Ti4O15 revealed by Raman spectroscopy

2015 ◽  
Vol 117 (6) ◽  
pp. 064102 ◽  
Author(s):  
Anton Prasetyo ◽  
Boriana Mihailova ◽  
Veinardi Suendo ◽  
Agustinus Agung Nugroho
Keyword(s):  
Raman Spectroscopy ◽  
Structural Transformations

Nanoscale phase transformations in relaxor-ferroelectric lead scandium tantalate and lead scandium niobate

2005 ◽  
Vol 220 (8) ◽  
Author(s):  
Boriana Mihailova ◽  
Ulrich Bismayer ◽  
Bernd Güttler ◽  
Marin Gospodinov ◽  
Alexander Boris ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Single Crystal ◽  
Phase Transformations ◽  
Far Infrared ◽  
Relaxor Ferroelectrics ◽  
Structural Transformations ◽  
Relaxor Ferroelectric ◽  
Infrared Ellipsometry ◽  
Polarized Raman Spectroscopy ◽  
Polarized Raman

AbstractStructural transformations that take place on cooling down in Pb-based relaxor ferroelectrics are investigated on the basis of polarized Raman spectroscopy and far infrared ellipsometry applied on single-crystal samples of PbSc

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