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265 results on '"Tegus, O."'

1. Influence of high-pressure heat treatment on magnetic property and phase transition critical behavior in La0.75Sr0.25Mn1 − xCoxO3 (x = 0, 0.1, 0.2)

Author

Xiang Jin, Jing Zhao, Huaijin Ma, Lei Gao, Tegus O, Jianjun Zhao, and Jiaohong Huang

Subjects
High pressure synthesize, Magnetocaloric effect, Critical behavior, Magnetic phase transition, Physics, QC1-999
Abstract

In this study, La0.75Sr0.25Mn1−xCoxO3 (x = 0, 0.1, 0.2) samples were synthesized using a high-pressure heat treatment method, and their magnetic properties and critical phase transition behaviors were systematically investigated. The prepared samples exhibited excellent single-phase characteristics with space group R 3¯ c. As the Co content increased, TC decreased from 325 to 211 K. In a 7 T magnetic field, the RCP values of the samples increased from 364.52 to 384.66 J·kg−1, significantly enhancing the cooling efficiency of the samples. The three samples exhibited a second-order phase transition, indicating a relatively small hysteresis in the system. The critical exponents were obtained by MAPs and K-F method. These results indicate that with an increase in Co doping, the β values also increase, suggesting that Co doping facilitates the establishment of long-range ferromagnetic order in the three samples.

Published
2024
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9. Study on high voltage (5 V) spinel lithium manganese oxide LiNi0.5Mn1.5O4 by doping niobium.

Author

Li, Wei, Wang, Xiaotao, Wu, Dan, Kong, Dehao, Wu, Han, Mang, Lai, Liao, Bo, Tegus, O., Cao, Yongjun, and Haschuluu, Oimod

Subjects
LITHIUM manganese oxide, NIOBIUM, HIGH voltages, X-ray photoelectron spectroscopy, SPINEL, NIOBIUM compounds, MANGANESE oxides
Abstract

The effect of niobium ions with high‐valence doping on high‐voltage LiNi0.5Mn1.5O4 (LNMO) materials was investigated. LiNi0.5Mn1.5−xNbxO4 was prepared by doping high‐valent niobium ions into LiNi0.5Mn1.5O4 material using the organic assisted combustion method. The experimental samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), electrochemical impedance (EI), and cyclic voltammetry (CV) analysis. The experimental results show that ‐doping with high‐valence niobium ions changes the orientation of the crystal plane growth of spinel particles, and the morphology of these particles changes from the octahedral shape before doping to the spherical shape after doping. With the increase in doping amount, the crystal structure changes gradually, resulting in the Li0.96Nb1.01O3 impurity phase. The doping of high valence‐niobium ions increases the content of Mn3+ in the material, resulting in the appearance of a 4 V discharge platform and the formation of a 4.7 and 4 V discharge platforms. The doping of Nb can improve the cycling stability of LiNi0.5Mn1.5O4 material, but the specific capacity of the material is reduced. [ABSTRACT FROM AUTHOR]

Published
2024
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