Jahn-Teller Phase Transitions in Non-Stoichiometric Oxides with Perovskite Structure: Effect of Mechanical Activation

2013 ◽  
Vol 334-335 ◽  
pp. 353-358
Author(s):  
Anatoly Yakovlevich Fishman ◽  
Nickolai Tkachev
Keyword(s):  
Phase Transitions ◽  
Mechanical Activation ◽  
Perovskite Structure ◽  
Microscopic Description ◽  
Oxide Systems ◽  
Teller Transition ◽  
Structure Phase ◽  
Jahn Teller ◽  
Nanostructural State ◽  
Theoretical Results

Structure phase transitions in nonstoichiometry oxides with perovskite structure were considered. The microscopic description of cooperative Jahn-Teller transition was suggested and the effects caused by mechanical activation of oxide systems (their conversion into nanostructural state, acceleration of oxidation-renewal reactions and immiscibility) were analized. The correspondence of the theoretical results to the data of experiment on phase states of mechanically activated oxide NdMnO3is shown.

Imperfection of the clustered perovskite structure, phase transitions, and magnetoresistive properties of ceramic La0.6Sr0.2Mn1.2 − x Ni x O3 ± δ (x = 0–0.3)

2012 ◽  
Vol 54 (4) ◽  
pp. 767-777 ◽  
Author(s):  
A. V. Pashchenko ◽  
V. P. Pashchenko ◽  
V. K. Prokopenko ◽  
A. G. Sil’cheva ◽  
Yu. F. Revenko ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Perovskite Structure ◽  
Structure Phase

Specific Features of Jahn-Teller Structure Phase Transitions in Nanocrystalline Materials

2009 ◽  
Vol 283-286 ◽  
pp. 53-58 ◽  
Author(s):  
Anatoly Yakovlevich Fishman ◽  
M.A. Ivanov ◽  
S.A. Petrova ◽  
Nickolai Tkachev ◽  
Vladimir Borisovich Vykhodets ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Nanocrystalline Materials ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
First Order ◽  
Structure Phase ◽  
Jahn Teller ◽  
Multi Phase ◽  
Nanosized Crystals

Specific features of the structural phase transitions of the first order were investigated in nanosized crystals with Jahn-Teller ions. As an example the phase transitions of martensite type with changes in symmetry from a cubic to a tetragonal one have been considered. The Kanamori model was used to take into account the size of nanocrystallites and the distribution of cations over non-equivalent crystallographic sublattices in such systems. It was shown the temperature and the latent heat of the transition decrease significantly for the nanoscaled grains. A possibility of multi-phase state for nanocrystalline materials was considered.

Phase Transitions and Spin Relaxation in La0.95Sr0.05MnO3

2003 ◽  
Vol 17 (10n12) ◽  
pp. 459-467 ◽  
Author(s):  
B. I. Kochelaev ◽  
E. Shilova ◽  
J. Deisenhofer ◽  
H.-A. Krug von Nidda ◽  
A. Loidl ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Model Calculation ◽  
Crystal Field ◽  
Spin Relaxation ◽  
Paramagnetic Resonance ◽  
Resonance Linewidth ◽  
Teller Transition ◽  
Jahn Teller

We present a model calculation of the paramagnetic-resonance linewidth in La 0.95 Sr 0.05 MnO 3. Both the temperature and the angular dependencies can be described by contributions from the crystal field due to the cooperative Jahn–Teller transition.

Utilizing total scattering to study the Jahn-Teller transition in La1-xCaxMnO3

2007 ◽  
Vol 2007 (suppl_26) ◽  
pp. 429-434
Author(s):  
E. S. Božin ◽  
X. Qiu ◽  
R. J. Worhatch ◽  
G. Paglia ◽  
M. Schmidt ◽  
...  
Keyword(s):  
Total Scattering ◽  
Teller Transition ◽  
Jahn Teller

Structure, phase transitions and molecular dynamics in ferroelastic crystal pyrrolidinium hexachloroantimonate(V), [C4H8NH2][SbCl6]

2005 ◽  
Vol 7 (4) ◽  
pp. 381-390 ◽  
Author(s):  
Ryszard Jakubas ◽  
Beata Bednarska-Bolek ◽  
Jacek Zaleski ◽  
Wojciech Medycki ◽  
Krystyna Hołderna-Natkaniec ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Phase Transitions ◽  
Structure Phase

scholarly journals Band structure, phase transitions, and semiconductor analogs in one-dimensional solid light systems

2009 ◽  
Vol 80 (6) ◽  
Author(s):  
James Quach ◽  
Melissa I. Makin ◽  
Chun-Hsu Su ◽  
Andrew D. Greentree ◽  
Lloyd C. L. Hollenberg
Keyword(s):  
Phase Transitions ◽  
Band Structure ◽  
One Dimensional ◽  
Structure Phase

Effects of complex additives on structure, phase transitions and dielectric properties of BSPT ceramics

2014 ◽  
Author(s):  
E. D. Politova ◽  
N. V. Golubko ◽  
G. M. Kaleva ◽  
A. V. Mosunov ◽  
S. Yu. Stefanovich ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Dielectric Properties ◽  
Structure Phase
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