Lattice dynamics and Raman spectrum of rutile TiO2: The role of soft phonon modes in pressure induced phase transition

2012 ◽  
Vol 137 (1) ◽  
pp. 282-289 ◽  
Author(s):  
Igor Lukačević ◽  
Sanjeev K. Gupta ◽  
Prafulla K. Jha ◽  
Davor Kirin
Keyword(s):  
Phase Transition ◽  
Raman Spectrum ◽  
Lattice Dynamics ◽  
Phonon Modes ◽  
Rutile Tio2

scholarly journals Особенности динамики решетки ферровольфрамат стронция в диапазоне температур 300-700 K

2020 ◽  
Vol 62 (12) ◽  
pp. 2169
Author(s):  
А.С. Анохин ◽  
А.Г. Разумная ◽  
А.В. Павленко
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
Lattice Dynamics ◽  
Diffuse Phase Transition ◽  
Tetragonal Symmetry ◽  
Cubic Phase ◽  
Phonon Modes ◽  
Temperature Behaviour ◽  
Spectra Analysis ◽  
Diffuse Phase

The lattice dynamics of strontium ferrotungsten ceramics have been studied by Raman spectroscopy in the temperature range 300−700 K. The spectra analysis confirmed tetragonal symmetry of strontium ferrotungsten which is consistent with the XRD results. The features of the temperature behaviour of the phonon modes of strontium ferrotungsten are revealed, and it is shown that a diffuse phase transition from the tetragonal to the cubic phase occurs at temperatures of 410–500 K.

scholarly journals The intricate lattice dynamics of perovskite oxides

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
A. Bussmann-Holder ◽  
J.H. Ko ◽  
K. Roleder
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Lattice Dynamics ◽  
Finite Size ◽  
Perovskite Oxides ◽  
Formation Temperature ◽  
Phonon Modes ◽  
Nonlinear Approach ◽  
Local Lattice ◽  
Local Anomalies

The lattice dynamics of perovskite oxides are investigated theoretically within the polarizability model which is a nonlinear approach taking into account anharmonic electron-lattice interactions. The emphasis is on local lattice anomalies which appear in the phonon modes dispersion. Above the actual phase transition temperature finite size polarized clusters appear at an onset temperature TBH which marks the precursor formation temperature. These local anomalies appear as well experimentally and are reviewed for various perovskite compounds.

scholarly journals Conversion of Methanol on Rutile TiO2 (110) and Tungsten Oxide Clusters: 2. The Role of Defects and Electron Transfer in Bifunctional Oxidic Photocatalysts

2021 ◽  
Author(s):  
Lars Mohrhusen ◽  
Jessica Kräuter ◽  
Katharina Al-Shamery
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
Tungsten Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Organic P ◽  
Rutile Tio2 ◽  
Metal Oxide Surfaces

The photochemical conversion of organic compounds on tailored transition metal oxide surfaces by (UV) irradiation has found wide applications ranging from the production of chemicals to the degradation of organic...

Lattice dynamics and phase transition in sodium azidea)

1977 ◽  
Vol 67 (1) ◽  
pp. 81-85 ◽  
Author(s):  
L. B. Kanney ◽  
N. S. Gillis ◽  
J. C. Raich
Keyword(s):  
Phase Transition ◽  
Lattice Dynamics
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