scholarly journals Dielectric properties and lattice dynamics ofα-PbO2-type TiO2: The role of soft phonon modes in pressure-induced phase transition to baddeleyite-type TiO2

2011 ◽  
Vol 84 (9) ◽  
Author(s):  
Yongqing Cai ◽  
Chun Zhang ◽  
Yuan Ping Feng
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Lattice Dynamics ◽  
Phonon Modes

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 Reconfigurable artificial microswimmers with internal feedback

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
L. Alvarez ◽  
M. A. Fernandez-Rodriguez ◽  
A. Alegria ◽  
S. Arrese-Igor ◽  
K. Zhao ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Properties ◽  
Light Absorption ◽  
Local Heating ◽  
Volume Phase Transition ◽  
Active Materials ◽  
Colloidal Clusters ◽  
Robotic Devices ◽  
Dynamical Control ◽  
Synthetic Models

AbstractSelf-propelling microparticles are often proposed as synthetic models for biological microswimmers, yet they lack the internally regulated adaptation of their biological counterparts. Conversely, adaptation can be encoded in larger-scale soft-robotic devices but remains elusive to transfer to the colloidal scale. Here, we create responsive microswimmers, powered by electro-hydrodynamic flows, which can adapt their motility via internal reconfiguration. Using sequential capillary assembly, we fabricate deterministic colloidal clusters comprising soft thermo-responsive microgels and light-absorbing particles. Light absorption induces preferential local heating and triggers the volume phase transition of the microgels, leading to an adaptation of the clusters’ motility, which is orthogonal to their propulsion scheme. We rationalize this response via the coupling between self-propulsion and variations of particle shape and dielectric properties upon heating. Harnessing such coupling allows for strategies to achieve local dynamical control with simple illumination patterns, revealing exciting opportunities for developing tactic active materials.

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