Effects of cation disorder and size on metamagnetism in A-site substituted Pr0.5Ca0.5MnO3 system

2005 ◽  
Vol 86 (16) ◽  
pp. 162504 ◽  
Author(s):  
K. R. Mavani ◽  
P. L. Paulose
Keyword(s):  
Cation Disorder ◽  
A Site

Effects of A-site cation disorder on structure and magnetocaloric properties in Y and Sr codoped La2∕3Ca1∕3MnO3 compounds

2009 ◽  
Vol 105 (7) ◽  
pp. 07D713 ◽  
Author(s):  
Qing Ji ◽  
Bin Lv ◽  
P. F. Wang ◽  
H. L. Cai ◽  
X. S. Wu ◽  
...  
Keyword(s):  
Cation Disorder ◽  
Magnetocaloric Properties ◽  
A Site

scholarly journals High stability of electro-transport and magnetism against the A-site cation disorder in SrRuO3

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Y. L. Wang ◽  
M. F. Liu ◽  
R. Liu ◽  
Y. L. Xie ◽  
X. Li ◽  
...  
Keyword(s):  
High Stability ◽  
Cation Disorder ◽  
A Site

PHASE SEPARATION INDUCED BY CATION DISORDER IN (La, Y)2/3(Sr, Ca)1/3MnO3

2011 ◽  
Vol 25 (11) ◽  
pp. 1501-1509
Author(s):  
A. M. ZHANG ◽  
H. L. CAI ◽  
X. S. WU ◽  
Z. H. WANG ◽  
J. GAO
Keyword(s):  
Phase Separation ◽  
Hole Concentration ◽  
Transition Width ◽  
Cation Disorder ◽  
Metal To Insulator Transition ◽  
Metal State ◽  
Phase Separation Behavior ◽  
A Site ◽  
Separation Behavior ◽  
Large Cation

Polycrystalline manganite oxides with different A-site cation disorder were synthesized. The hole concentration and average radius of A-site cation are kept unchanged while the A-site cation disorder increases linearly by Y and Sr co-doped in La 2/3 Ca 1/3 MnO 3. All these samples exhibit a paramagnetic insulator to ferromagnetic (FM) metal transition, and the transition temperature T C and T MI decrease while the transition width increases with increasing the A-site cation disorder. T MI is usually 10 K higher than T C for the small cation disorder samples. However, with increasing the cation disorder, T MI is about 60 K lower than T C , and the resistivity increases in magnitude while the magnetization decreases. The metal-to-insulator transition for samples with small cation disorder can be well described by a percolative model, which indicates FM-metal state and antiferromagnetic insulator state assuredly coexist in the transition interval. It reveals that cation disorder suppresses the long-range FM-metal state which results in the phase separation behavior in samples with large cation disorder.

Effect of A-site cation disorder on charge ordering and ferromagnetism of La0.5Ca0.5−yBayMnO3

2002 ◽  
Vol 248 (2) ◽  
pp. 348-354 ◽  
Author(s):  
V.N. Smolyaninova ◽  
S.E. Lofland ◽  
C. Hill ◽  
R.C. Budhani ◽  
Z. Serpil Gonen ◽  
...  
Keyword(s):  
Charge Ordering ◽  
Cation Disorder ◽  
A Site

Atomistic Simulation of Defect Energy in Pyrochlores and its Effect on Disorder

2008 ◽  
Vol 368-372 ◽  
pp. 1689-1691
Author(s):  
Hui Ling Zhang ◽  
Qun Bo Fan ◽  
Fu Chi Wang ◽  
Feng Zhang
Keyword(s):  
High Temperature ◽  
Atomistic Simulation ◽  
Defect Formation ◽  
Temperature Stability ◽  
Detailed Calculation ◽  
High Temperature Stability ◽  
Defect Energy ◽  
Cation Disorder ◽  
A Site ◽  
Different Order

To enhance the high-temperature stability of zirconate pyrochlore structures, one has to focus on their transformation to the disordered state, fluorite. An atomistic simulation calculation is presented in this paper to predict the propensity of rare earth zirconate pyrochlores to transform to fluorite at high temperature. By detailed calculation of defect formation energy of cation antisites and Frenkel pair, as well as their interactions, the mechanisms of disorder transformation are ascertained. The results show that the tendency of cation disorder is less than the anion’s and disorder transformation will accelerate in advanced stage. The calculation of defect energy in pyrozirconates with different cation on the A site have proved helpful in unraveling their different order-disorder transformation tendency.

scholarly journals Composition dependence of dielectric properties in Pb(Zn1∕3Nb2∕3)O3–PbTiO3–BaTiO3 (PZN–PT–BT) relaxor ferroelectric ceramics

2017 ◽  
Vol 07 (02) ◽  
pp. 1750008
Author(s):  
Qiang Gao ◽  
Li Jin ◽  
Yu Cui ◽  
Ye Zhao ◽  
Kun Yu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Composition Dependence ◽  
Solid State Reaction Method ◽  
Ferroelectric Ceramics ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cation Disorder ◽  
Diffusion Phase ◽  
A Site

Perovskite solid solution ceramics of PZN–PT–BT with several compositions were synthesized by solid-state reaction method. X-ray diffraction results indicate pure perovskite structures for all samples. Dielectric measurements show that the implicit Ba(Zn[Formula: see text]Nb[Formula: see text])O3(BZN) composition could broaden the diffusion phase transition (DPT) peaks and lower the [Formula: see text] and [Formula: see text] values. The observed dielectric properties may be caused by the increased cation disorder due to the substitution of barium onto the A-site and titanium onto the B-site.

scholarly journals Effect of barium doping on electrical and electromechanical properties of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3

2019 ◽  
Vol 8 (3) ◽  
pp. 198
Author(s):  
Mohammed Mesrar ◽  
Tajdine Lamcharfi ◽  
Nor-Said Echatoui ◽  
Farid Abdi ◽  
Fatima Zahra Ahjyaje ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Frequency Dispersion ◽  
Ceramic Materials ◽  
Unit Cell ◽  
Gradual Change ◽  
X Ray Diffraction ◽  
Electromechanical Properties ◽  
Sem Images ◽  
Cation Disorder ◽  
A Site

<p>The effect of Barium doping is studied on ferroelectric properties of (1-x)(Na<sub>0.5</sub>Bi<sub>0</sub>.<sub>5</sub>)TiO<sub>3</sub>-xBaTiO<sub>3</sub> with( x = 0.00; 0.0 3; 0.05; 0.06; 0.07; 0.08 and 0.10)  prepared through solid state sintering route. X-ray diffraction along with Rietveld refinement revealed a gradual change in crystal structure from rhombohedral to tetragonal with increasing BaTiO3 doping in the compound. SEM images have shown a uniform distribution of grains and change in grain size with BaTiO<sub>3</sub> concentration. Dielectric and dispersive studies have been carried out. The rhombohedral distortion of the unit cell slightly increased and ferroelectric transition temperature, T<sub>m</sub> decreased with the increase of Barium content and all compositions of (1-x)(Na<sub>0.5</sub>Bi<sub>0</sub>.<sub>5</sub>)TiO<sub>3</sub>-xBaTiO<sub>3</sub>ceramic materials reveal diffuse phase transition that is marked by a strong frequency dispersion of the permittivity which would be related with the cation disorder in the A site of the unit cell. Combined impedance and electrical propriety were used to analyze impedance data. The electromechanical parameters were calculated from the resonant and anti-resonant frequencies from the evolution of the permittivity according to the frequency plots. The electromechanical coefficients for (1-x)(Na<sub>0.5</sub>Bi<sub>0</sub>.<sub>5</sub>)TiO<sub>3</sub>-xBaTiO<sub>3</sub>with all compositions were found to be much larger than that of pure Na<sub>0.5</sub>Bi<sub>0.5</sub>TiO<sub>3.</sub></p>

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