JOURNAL OF SOLID STATE CHEMISTRY
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2025
·
IF 3.5
Mingming Huang,Shoushuang Li,Rui Cui,Laura C.J. Pereira,Ambre Theron,Olivier Mentré,Xiedong Cheng,Feifan Li,Hui Shao,Minfeng Lü
Two transition metal selenites Li 2 Mn 2.5 (SeO 3 ) 4 and Li 2 Co 3 (SeO 3 ) 4 were synthesized using hydrothermal and solid-state reactions, respectively. Both compounds form similar three-dimensional (3D) frameworks featuring twisted one-dimensional (1D) chains, where transition metal polyhedra connect through shared corners or edges. However, Li 2 Co 3 (SeO 3 ) 4 and Li 2 Mn 2.5 (SeO 3 ) 4 exhibit distinct structural features. The former contains one type of [4 + 2] Li, two different CoO 6 octahedra, and two SeO 3 pyramids. The latter possesses one type of [5 + 1] Li, one Mn 3+ O 6 octahedron, one Mn 2+ O 5 square-pyramid, and two SeO 3 pyramids. Consequently, the lithium polyhedron undergoes unusually strong irregular distortions in the cobalt compound, but experiences strong distortions in the manganese compound. Magnetic measurements confirm that Li 2 Co 3 (SeO 3 ) 4 with a S = 3/2 uniform spin chain structure possess a long-range antiferromagnetic ordering and field-induced spin-flip transition at 2K, where the fitting via the Bonner–Fisher model with interchain mean-field corrections yields J intra /k B = -4.32(2) K, J inter /k B = −0.64(10) K, g = 2.34(3). Systematic distortion regularities in central metal cation polyhedra emerge from quantifying the ratio of SeO 3 groups to total cation polyhedra within lithium transition metal selenites.
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DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Shuaikun Li,Yanhong Wang,Haibo Li,Hang Liu,Yun Lv,Hongcheng Lu
A novel magnetic alkaline-earth chromium fluoroiodate Ba 2 CrIO 3 F 6 has been successfully synthesized via the hydrothermal method and characterized for its structure and physical properties by single crystal X-ray diffraction, attenuated total reflection (ATR) infrared spectroscopy, UV-vis-NIR spectroscopy, thermal stability, as well as magnetic susceptibility, and specific heat. The compound Ba 2 CrIO 3 F 6 contains the [CrIO 3 F 6 ] 4- spin chains which are further separated by nonmagnetic Ba 2+ cations. The magnetic susceptibility results show no long-range magnetic order down to 2 K, which are further confirmed by specific heat measurement. The positive Weiss temperature and the increase of χT - T curve at low temperature both suggest the magnetic exchange interactions through the Cr 3+ −IO 4 F−Cr 3+ pathway are unexpectedly ferromagnetic. Our work illustrates that it is promising to use the IO x F y anion group for the design and construction of novel magnetic materials with ferromagnetic exchange interactions for potential spintronics device applications.
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Alimujiang Yalikun,Yanhong Wang,Yun Lv,Yaling Dou,Hyun-Joo Koo,Jiaojiao Cao,Wei Qi,Keke Huang,Myung-Hwan Whangbo,Zhongwen Ouyang,Hongcheng Lu
A series of analogous chain selenite chlorides Ba2M(SeO3)2Cl2 (M = Cu 1, Ni 2, Co 3, Mn 4) and Pb2Cu(SeO3)2Cl2 5 with tunable spin S from S = 1/2 to S = 5/2 have been hydrothermally synthesized and characterized. These analogues crystallized in the orthorhombic Pnnm space group (monoclinic P21/n space group for 5) all containing M2+–SeO3–M2+ spin chains, which are further separated by the Ba2+ ions (Pb2+ for 5). The magnetic susceptibility results of 1, 2, and 5 show broad maxima around 80.0, 18.9, and 78.0 K, respectively, indicating good one-dimensional (1D) magnetism. Meanwhile, no long-range order (LRO) is observed down to 2 K for both 1 and 5, while the isostructural compounds 2, 3, and 4 exhibit LRO at 3.4 K, 10.8 K, and 5.7 K, respectively, which are further confirmed by the heat capacity and electron spin resonance results, as well as the observed spin-flop transitions in the M–H curves measured at 2 K below TN. The magnetizations of 1–5 at 7 T are still far from saturation. In addition, thermal stability and FT-IR and UV–vis–NIR spectroscopy of 1–5 are reported.
研究领域:
无机化学
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材料科学
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固体物理
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磁学
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晶体学
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 97
·期 3
·663-671
·
IF 2.326
Wang Yongqiang,Zhou Jin,Shi Chenfei,Gong Gaoshang,Hu Huiyun,Su Yuling
Previous reports depict that the nonstoichiometric Co/Mn ratio greatly affects the physical properties of Ca 3 CoMnO 6 , but few papers focus on the Co/Mn site doping effect. In order to investigate the influence of the substitution on the magnetization, partial Mn 4+ ions were replaced with Al 3+ ions and polycrystalline Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) samples were prepared. All the samples crystallized into rhombohedral structure without existence of impurities. SEM patterns showed that the mean particle size decreased with the introduction of Al element. Due to the dilution effect of nonmagnetic Al 3+ ions to the spin chains, the competing short-range antiferromagnetic/ferromagnetic order caused by the “order by disorder” phenomenon was suppressed. The high-temperature spin freezing peak disappeared gradually and the doped samples presented a faster dynamic behavior, indicating a more robust long-range antiferromagnetic order. The time-dependent magnetization showed a nonmonotonic relaxation in a field of 5T, implying the possible existence of quantum tunneling of magnetization.
Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) samples were synthesized and all of them crystallized into single-phase rhombohedral structure. Due to the dilution effect of the nonmagnetic Al 3+ ions to the …Co 2+ -Mn 4+ -Co 2+ -Mn 4+ …spin chains, the high-temperature spin freezing peak disappears gradually and a faster dynamic behavior in the doped samples is observed. Our investigation confirms that the substitution of the nonmagnetic Al 3+ ions has a similar effect with the Co/Mn defection. This is to say that the nonmagnetic doping could also suppress the formation of short-range magnetic correlation and help in building a more robust long-range antiferromagnetic order. For the nonmonotonic relaxation of the time-dependent magnetization, it implies the possible existence of quantum tunneling of magnetization. The normalized time-dependent M/M 0 curves for Ca 3 CoMn 1- x Al x O 6 ( x = 0, 0.05, 0.1, 0.15, 0.2) measured at 5 K. (1) The magnetization was measured by cooling the samples down to 5K, a field of 5T was applied and kept for 10 min, switching off the field and the remanent magnetization was recorded. (2) The magnetization was measured by cooling the samples down to 5 K firstly and the magnetic field was switched on, as well as field reaches 5T the magnetization was recorded immediately.
研究领域:
凝聚态物理
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磁性材料
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强关联电子系统
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低温物理
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自旋链
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DOI
高影响因子
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