Lattice dynamics and temperature-dependent Raman and infrared studies of multiferroic Mn0.85Co0.15WO4and Mn0.97Fe0.03WO4crystals

2011 ◽  
Vol 83 (17) ◽  
Author(s):  
M. Maczka ◽  
M. Ptak ◽  
K. Hermanowicz ◽  
A. Majchrowski ◽  
A. Pikul ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Temperature Dependent ◽  
Infrared Studies

Temperature dependent electron–phonon coupling of Au resolved via lattice dynamics measured with sub-picosecond infrared pulses

2021 ◽  
Vol 129 (19) ◽  
pp. 193104
Author(s):  
John A. Tomko ◽  
Sushant Kumar ◽  
Ravishankar Sundararaman ◽  
Patrick E. Hopkins
Keyword(s):  
Lattice Dynamics ◽  
Phonon Coupling ◽  
Temperature Dependent ◽  
Electron Phonon Coupling

He-atom scattering study of the temperature-dependent charge-density-wave surface structure and lattice dynamics of 2H-TaSe2(001)

1990 ◽  
Vol 41 (9) ◽  
pp. 5707-5716 ◽  
Author(s):  
G. Brusdeylins ◽  
C. Heimlich ◽  
J. G. Skofronick ◽  
J. P. Toennies ◽  
R. Vollmer ◽  
...  
Keyword(s):  
Charge Density ◽  
Surface Structure ◽  
Charge Density Wave ◽  
Lattice Dynamics ◽  
Density Wave ◽  
Wave Surface ◽  
Temperature Dependent ◽  
Atom Scattering ◽  
Scattering Study ◽  
He Atom

MULTIFERROIC MATERIALS Bi1-xSmxFeO3: A STUDY OF RAMAN AND ABSORPTION SPECTROSCOPIES

2010 ◽  
Vol 19 (02) ◽  
pp. 247-254 ◽  
Author(s):  
NGUYEN VAN MINH ◽  
DAO VIET THANG
Keyword(s):  
Lattice Dynamics ◽  
Optical Band Gap ◽  
Solid State Reaction Method ◽  
Diffraction Measurement ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Lattice Constants ◽  
Raman Measurement

Multiferroic Bi 1-x Sm x FeO 3(x = 0.00, 0.05, 0.1, 0.15, 0.2) ceramics were prepared by conventional solid state reaction method. X-ray diffraction measurement was carried out to characterize the crystal structure and to detect the impurities existing in these ceramics. The substitution of rare earth Sm for Bi was found to decrease the impurity phase in BiFeO 3 ceramics. There is strong evidence that both lattice constants a and c of the unit cell become smaller as the Sm 3+ content is increased. The effect of introducing Sm 3+ is shown to decrease the optical band gap for doped sample Bi 1-x Sm x FeO 3. Additionally, the temperature-dependent Raman measurement performed for the lattice dynamics study of Bi 1-x Sm x FeO 3 samples reveals a strong band centered at around 1000–1300 cm-1 which is associated with the resonant enhancement of two-phonon Raman scattering in the multiferroic Bi 1-x Sm x FeO 3 samples. This two-phonon signal is shown to broaden with increasing x. The Raman spectra at low wavenumbers are suggested to be related with magnon in this system.

scholarly journals Iron Isotope Effect and Local Lattice Dynamics in the (Ba, K)Fe2As2 Superconductor Studied by Temperature-Dependent EXAFS

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Wangsheng Chu ◽  
Jie Cheng ◽  
Shengqi Chu ◽  
Tiandou Hu ◽  
Augusto Marcelli ◽  
...  
Keyword(s):  
Isotope Effect ◽  
Lattice Dynamics ◽  
Iron Isotope ◽  
Temperature Dependent ◽  
Local Lattice

A Lattice Dynamical Approach for Finding the Lithium Superionic Conductor Li3ErI6

2020 ◽  
Author(s):  
Roman Schlem ◽  
Tim Bernges ◽  
Cheng Li ◽  
Marvin Kraft ◽  
Nicolo Minafra ◽  
...  
Keyword(s):  
Lattice Dynamics ◽  
Ionic Conductivities ◽  
Ionic Transport ◽  
Superionic Conductors ◽  
Material System ◽  
Ionic Conductors ◽  
Anion Sublattice ◽  
Temperature Dependent ◽  
Solid State Batteries ◽  
Debye Frequency

<p>Driven by the increasing attention that the superionic conductors Li<sub>3</sub>MX<sub>6</sub> (M = Y, Er, In, La; X = Cl, Br, I) have gained recently for the use of solid-state batteries, and the idea that a softer, more polarizable anion sublattice is beneficial for ionic transport, here we report Li<sub>3</sub>ErI<sub>6</sub>, the first experimentally-obtained iodine-based compound within this material system of ionic conductors. Using a combination of synchrotron and neutron diffraction, we elucidate the structure, the lithium positions and possible diffusion pathways of Li<sub>3</sub>ErI<sub>6</sub>. Temperature-dependent impedance spectroscopy shows low activation energies of 0.37 and 0.38 eV alongside promising ionic conductivities of 0.65 mS·cm<sup>-1</sup> and 0.39 mS·cm<sup>-1</sup>directly after ball milling and the subsequently annealed Li<sub>3</sub>ErI<sub>6</sub>, respectively. Speed of sound measurements are used to determine the Debye frequency of the lattice as a descriptor of the lattice dynamics and overall lattice softness, and Li<sub>3</sub>ErI<sub>6</sub> is compared to the known material Li<sub>3</sub>ErCl<sub>6</sub>. The softer, more polarizable framework from the iodide anion leads to improved ionic transport, showing that the idea of softer lattices holds up in this class of materials. This work provides Li<sub>3</sub>ErI<sub>6</sub> as an interesting novel framework for optimization in the class of halide-based ionic conductors.</p>

Temperature-dependent EXAFS study of the local structure and lattice dynamics in cubic Y2O3

2016 ◽  
Vol 23 (2) ◽  
pp. 510-518 ◽  
Author(s):  
Inga Jonane ◽  
Karlis Lazdins ◽  
Janis Timoshenko ◽  
Alexei Kuzmin ◽  
Juris Purans ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Temperature Dependence ◽  
Local Structure ◽  
Lattice Dynamics ◽  
Reverse Monte Carlo ◽  
Temperature Dependent ◽  
X Ray ◽  
Exafs Study ◽  
X Ray Absorption ◽  
Reverse Monte Carlo Method

The local structure and lattice dynamics in cubic Y2O3were studied at the YK-edge by X-ray absorption spectroscopy in the temperature range from 300 to 1273 K. The temperature dependence of the extended X-ray absorption fine structure was successfully interpreted using classical molecular dynamics and a novel reverse Monte Carlo method, coupled with the evolutionary algorithm. The obtained results allowed the temperature dependence of the yttria atomic structure to be followed up to ∼6 Å and to validate two force-field models.

Pressure- and temperature-dependent inelastic neutron scattering study of the phase transition and phonon lattice dynamics in para-terphenyl

2021 ◽  
Author(s):  
Qingan Cai ◽  
Michael McIntire ◽  
Luke L. Daemen ◽  
Chen Li ◽  
Eric L. Chronister
Keyword(s):  
Phase Transition ◽  
Neutron Scattering ◽  
Temperature Dependence ◽  
Lattice Dynamics ◽  
Inelastic Neutron Scattering ◽  
Ambient Pressure ◽  
Inelastic Neutron ◽  
Temperature Dependent ◽  
Scattering Study ◽  
Neutron Scattering Study

Inelastic neutron scattering has been performed on para-terphenyl at temperatures from 10 to 200 K and under pressures from the ambient pressure to 1.51 kbar. The temperature dependence of phonons,...

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