Spin State of Cobalt Ions and the Magnetic Properties of Heavily Ba-Substituted Cobaltites with Perovskite Structure

2018 ◽  
Vol 255 (10) ◽  
pp. 1800315
Author(s):  
Igor Troyanchuk ◽  
Maxim Bushinsky ◽  
Nina Tereshko ◽  
Clemens Ritter ◽  
Vadim Sikolenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spin State ◽  
Perovskite Structure ◽  
Cobalt Ions

Spin-state transition and microscopic magnetic properties of LaCoO3

1997 ◽  
Vol 230-232 ◽  
pp. 756-758 ◽  
Author(s):  
Masayuki Itoh ◽  
Masami Mori ◽  
Masaru Sugahara ◽  
Touru Yamauchi ◽  
Yutaka Ueda
Keyword(s):  
Magnetic Properties ◽  
Spin State ◽  
State Transition ◽  
Spin State Transition

Magnetic properties of ferrites-cobaltites Bi1 − x La x Fe1 − x Co x O3 (1.0 ≥ x ≥ 0.7) with a perovskite structure

2013 ◽  
Vol 39 (5) ◽  
pp. 589-596 ◽  
Author(s):  
A. A. Zatsiupa ◽  
L. A. Bashkirov ◽  
G. S. Petrov ◽  
L. S. Lobanovskii ◽  
S. V. Trukhanov
Keyword(s):  
Magnetic Properties ◽  
Perovskite Structure

scholarly journals Impact of Alkali Ions Codoping on Magnetic Properties of La0.9A0.1Mn0.9Co0.1O3 (A: Li, K, Na) Powders and Ceramics

2020 ◽  
Vol 10 (24) ◽  
pp. 8786
Author(s):  
Paweł Głuchowski ◽  
Ruslan Nikonkov ◽  
Robert Tomala ◽  
Wiesław Stręk ◽  
Tatsiana Shulha ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Exchange Interactions ◽  
Structural Disorder ◽  
Subsequent Increase ◽  
Cobalt Ions ◽  
X Ray ◽  
Alkali Ions ◽  
High Pressure Sintering ◽  
Combustion Technique

The aim of the work was to check how the introduction of alkali and cobalt ions into a manganese structure can affect the structural disorder and, in consequence, lead to the changes (improvements) of magnetic properties. The high-pressure sintering technique was applied to check if the external factor can modify the magnetization of manganites. Nanocrystalline La0.9A0.1Mn0.9Co0.1O3 (where A is Li, K, Na) powders were synthesized by the combustion technique. The respective powders were used for nanoceramics preparation by the high-pressure sintering technique. The structure and morphology of the compounds were studied by X-ray powder diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. Magnetization studies for all compounds were performed in order to check the changes induced by either codoping or the sintering pressure. It was found that the type of the dopant ion and sintering pressure produced significant changes to the magnetic properties of the studied compounds. Alkali ions lead to the stabilization of Co ions in the +2 oxidation state and the formation of positive exchange interactions Mn3+–Mn4+ and Co2+–Mn4+ and the subsequent increase in remanent magnetization. High sintering pressure leads to a decrease in grain size and reduction of long-range ferromagnetic order and lower magnetization.

Tuning magnetic properties of antiferromagnetic chains by exchange interactions: ab initio studies

2015 ◽  
Vol 17 (39) ◽  
pp. 26302-26306 ◽  
Author(s):  
Kun Tao ◽  
Qing Guo ◽  
Puru Jena ◽  
Desheng Xue ◽  
Valeri S. Stepanyuk
Keyword(s):  
Magnetic Properties ◽  
Ab Initio ◽  
Spin State ◽  
Exchange Interactions

The possibility of using exchange interactions to manipulate the spin state of an antiferromagnetic nanostructure is explored using ab initio calculations.

scholarly journals Studies on the spin-state equilibria of cobalt ions in the system La1−x Na x Co1−x Nb x O3 (x⩽0·40)

1989 ◽  
Vol 12 (1) ◽  
pp. 53-56
Author(s):  
Om Parkash ◽  
N Chaturvedi ◽  
M Tiwari ◽  
Devendra Kumar
Keyword(s):  
Spin State ◽  
Cobalt Ions

scholarly journals Phase equilibria in the YFeO3 – YСoO3 system in air

2021 ◽  
Vol 8 (1) ◽  
pp. 20218108
Author(s):  
A. V. Bryuzgina ◽  
A. S. Urusova ◽  
I. L. Ivanov ◽  
V. A. Cherepanov
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
Phase Equilibria ◽  
Spin State ◽  
Solid Solutions ◽  
Homogeneity Range ◽  
Perovskite Structure ◽  
Single Phase ◽  
Decomposition Temperature ◽  
Unusual Behavior

YFe1-xСоxO3 solid solutions were prepared by glycerol-nitrate technique. The homogeneity range of solid solutions was studied within the temperature range 1173 – 1573 K. A continues series of solid solution below the decomposition temperature of YСоO3, which was shown to be equal to 1266 ± 6 K, begins to narrow at higher temperatures and becomes equal to 0 ≤ x ≤ 0.1 at 1573 K. The phase diagram of the YFeO3 – YСoO3 system in the “T – composition” coordinates was divided into three fields. Similar to the parent ternary oxides, all single-phase YFe1-xСоxO3 solid solutions possess orthorhombically distorted perovskite structure (Pnma space group). Unusual behavior of orthorhombic distortions in YFe1-xСоxO3 with temperature was explained by probable changes in spin state of Co3+ ions.

scholarly journals Co-Substitution Effect in Room-Temperature Ferromagnetic Oxide Sr3.1Y0.9Co4O10.5

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2301
Author(s):  
Akihiro Tsuruta ◽  
Shuji Kawasaki ◽  
Masashi Mikami ◽  
Yoshiaki Kinemuchi ◽  
Yoshitake Masuda ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
High Spin ◽  
Spin State ◽  
Room Temperature ◽  
High Spin State ◽  
Substitution Effect ◽  
Co Substitution ◽  
Intermediate Spin ◽  
Intermediate Spin State

We investigated the Co substitution effect for the magnetic properties in room-temperature ferromagnetic oxide Sr3.1Y0.9Co4O10.5. The substituted element (Al and Ga) and low-spin state Co3+, which was changed from a high-spin or intermediate-spin state by Al or Ga substitution, reduced the Curie temperature to even 1.5 times lower than the temperature estimated from a simple dilution effect. Al3+ preferentially substituted for intermediate-spin-state Co3+ in the ferrimagnetic CoO6 layer and deteriorated the saturation magnetization of Sr3.1Y0.9Co4O10.5. By contrast, Ga3+ substituted for high-spin-state Co3+ in the CoO6 layer and/or the antiferromagnetic CoO4.25 layer and enhanced the saturation magnetization per Co ion. These results indicate that the magnetic properties of Sr3.1Y0.9Co4O10.5 can be controlled by selectively substituting for Co3+ with different spin states.

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