Synthesis and the physical properties of layered copper oxytellurides Sr2TMCu2Te2O2 (TM = Mn, Co, Zn)

Song, Dongjoon; Guélou, Gabin; Mori, Takao; Ochi, Masayuki; Kuroki, Kazuhiko; Fujihisa, Hiroshi; Gotoh, Yoshito; Iwasa, Yuki; Eisaki, H.

doi:10.1039/c8tc04506b

Cited by 18 publications

(26 citation statements)

References 33 publications

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“…Here, we show the high-pressure and high-temperature synthesis of Ba 2 CoO 2 Ag 2 Te 2 . Prior to this study, a number of cobalt-containing layered oxychalcogenides A 2 CoO 2 M′ 2 X 2 and oxyhalides A 2 CoO 2 X 2 (A = Sr, Ba; M′ = Cu, Ag; X = S, Se, Te, Cl, Br), synthesized at ambient pressure, have been reported (see Figure a). − These materials are characterized by a large magnetic moment with an unquenched orbital component. − According to Clarke and coauthors, the total magnetic moment can be linearly scaled by a tetrahedral distortion in the heteroleptic trans -coordination CoO 4 X 2 (Figure ). It turns out, however, that Ba 2 CoO 2 Ag 2 Te 2 has a much smaller magnetic moment and deviates from the scaling rule.…”

Section: Introductionmentioning

confidence: 99%

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

et al. 2020

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Using a high-pressure synthesis method, we prepared the layered oxychalcogenide Ba 2 CoO 2 Ag 2 Te 2 (space group: I4/mmm) with alternating stacks of CoO 2 and Ag 2 Te 2 layers, separated by Ba atoms. The CoO 2 plane is greatly extended (Co−O = 2.19 Å on average) due to tensile strain from adjacent Ag 2 Te 2 layers, causing displacement of oxide anions. Layered cobaltates with trans-CoO 4 X 2 (X = chalcogen, halogen) coordination feature large spin−orbit coupling, which is linearly scaled by the tetrahedral factor of d Co−X /d Co−O . However, applying this relation to Ba 2 CoO 2 Ag 2 Te 2 yields a magnetic moment of ∼4 μ B , which is nearly twice the experimentally observed value of 1.87(17) μ B . This result, along with a reduced Neél temperature (T N = 60 K), originates from the off-centered position of otherwise under-bonded oxide anions, which changes the crystal field splitting of Co d orbitals.

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Section: Introductionmentioning

confidence: 99%

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

et al. 2020

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“…A range of mixed-anion phases can be prepared containing Co 2+ cations in approximately square-planar coordination in which CoO 2 2– sheets are stacked with either A 2 B 2 Ch 2 2+ (A = Sr, Ba; B = Cu, Ag; Ch = S, Se, Te) ,− transition-metal chalcogenide layers, or A 2 X 2 2+ (A = Sr; X = Cl, Br) , rock-salt layers. These phases are observed to adopt antiferromagnetically ordered states at low temperature, consistent with strong Co(d x 2 – y 2 ) 1 –O(2p)–Co(d x 2 – y 2 ) 1 180° superexchange interactions within the CoO 2 planes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Magnetism of Extended Solids Containing Transition-Metal Cations in Square-Planar, MO₄ Coordination Sites

Hayward

2019

Inorg. Chem.

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With the exception of systems containing Cu 2+ , complex metal oxides containing paramagnetic transitionmetal cations in square-planar coordination are rare. However, by either introducing chalcogenide, pnictide, or halide anions to form mixed-anion systems or by utilizing low-temperature topochemical reduction via anion deintercalation, an extensive range of phases containing square-planar MO 4 units can be prepared. The crystal chemistry of a series of transition-metal A 2 MO 2 X 2 oxyhalide and A 2 MO 2 B 2 X 2 oxychalcogenide and oxypnictide phases is reviewed along with how their magnetic behavior changes as a function of the transition-metal and electron count. As a contrast, these mixed-anion phases are then compared to a series of topochemically reduced, metastable transition-metal oxides that also contain square-planarcoordinated transition metals, to more fully illustrate the magnetic properties of extended frameworks of square-planar MO 4 units.

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“…As new functional materials, mixed-anion inorganic chalcogenides have been receiving widespread attention for their fascinating physical properties, such as nonlinear-optical (NLO) behaviors, thermoelectricity, photoluminescence, superconductivity, magnetism, etc. − Such diverse applications mainly rely on the anionic diversity of these materials. One of the most typical representatives in this field is oxychalcogenides, which contain the different chemical bonding related to oxygen (O) and chalcogen (Q) elements.…”

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confidence: 99%

[(Ba₁₉Cl₄)(Ga₆Si₁₂O₄₂S₈)]: a Two-Dimensional Wide-Band-Gap Layered Oxysulfide with Mixed-Anion Chemical Bonding and Photocurrent Response

Shi

Zhang

et al. 2019

Inorg. Chem.

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Mixed-anion compounds play an essential part in modern structural chemistry. In this Communication, an unprecedented hexanary oxysulfide, [(Ba19Cl4)(Ga6Si12O42S8)] (FJ-1), was synthesized at 1073 K by a standard solid-state method, which is a new phase in the AE/MIII/MIV/O/Q/X (AE = alkaline-earth metal; MIII = group 13 metal; MIV = group 14 metal; Q = chalcogen; X = halogen) system. FJ-1 adopts a new structure type and crystallizes in the orthorhombic system with space group Cmcm. In the structure, unique two-dimensional [Ga6Si12O42S8]34– layers formed by the familiar [SiO4] species and unusual heteroligand [GaO2S2] and [GaO3S] tetrahedra extend the intralayer linking. Significantly, a photoelectrochemical test revealed that FJ-1 is photoresponsive under ultraviolet illumination. Moreover, density functional theory calculations were employed to gain insight into the relationship between the electronic structure and optical properties. Such work will be conducive to the structural diversity of gallium coordination chemistry by exploration of the new mixed-anion functional chalcohalides.

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Synthesis and the physical properties of layered copper oxytellurides Sr₂TMCu₂Te₂O₂ (TM = Mn, Co, Zn)

Abstract: We synthesized a new series of layered copper oxytellurides Sr2TMCu2Te2O2 with variation in transition metal (TM = Mn, Co, and Zn) elements.

Cited by 18 publications

References 33 publications

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

Synthesis and Magnetism of Extended Solids Containing Transition-Metal Cations in Square-Planar, MO₄ Coordination Sites

[(Ba₁₉Cl₄)(Ga₆Si₁₂O₄₂S₈)]: a Two-Dimensional Wide-Band-Gap Layered Oxysulfide with Mixed-Anion Chemical Bonding and Photocurrent Response

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Synthesis and the physical properties of layered copper oxytellurides Sr2TMCu2Te2O2 (TM = Mn, Co, Zn)

Abstract: We synthesized a new series of layered copper oxytellurides Sr2TMCu2Te2O2 with variation in transition metal (TM = Mn, Co, and Zn) elements.

Cited by 18 publications

References 33 publications

High-pressure Synthesis of Ba2CoO2Ag2Te2 with Extended CoO2 Planes

High-pressure Synthesis of Ba2CoO2Ag2Te2 with Extended CoO2 Planes

Synthesis and Magnetism of Extended Solids Containing Transition-Metal Cations in Square-Planar, MO4 Coordination Sites

[(Ba19Cl4)(Ga6Si12O42S8)]: a Two-Dimensional Wide-Band-Gap Layered Oxysulfide with Mixed-Anion Chemical Bonding and Photocurrent Response

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Synthesis and the physical properties of layered copper oxytellurides Sr₂TMCu₂Te₂O₂ (TM = Mn, Co, Zn)

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

High-pressure Synthesis of Ba₂CoO₂Ag₂Te₂ with Extended CoO₂ Planes

Synthesis and Magnetism of Extended Solids Containing Transition-Metal Cations in Square-Planar, MO₄ Coordination Sites

[(Ba₁₉Cl₄)(Ga₆Si₁₂O₄₂S₈)]: a Two-Dimensional Wide-Band-Gap Layered Oxysulfide with Mixed-Anion Chemical Bonding and Photocurrent Response