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• W2082211805 abstract "Investigations in the Sr–Co–Ga–O system by means of transmission electron microscopy techniques have allowed the detection of a new layered cobaltite. Its structure has been obtained by combining high-resolution images and powder X-ray diffraction. The modulated structure of this novel oxide, (Ga1/3Co2/3)2Sr2CoO6+δ is derived from the perovskite with a=ap√2, b=ap√2, c=19.2Å and a modulation vector q*=q1a*+q2c*. For the as-prepared samples, the δ value is close to 0.4 and the modulated structure (q1≈1/3 and q2=1) can be described in an ideal orthorhombic 3D supercell Bb2b with the unit cell parameters a=3ap√2=16.3030(5)Å, b=5.4725(2)Å and c=19.2034(4)Å. The layer stacking consists in an intergrowth between a [SrCoO3] perovskite-type block and a block of triple layers, [(SrO)(Co2/3Ga1/3O1+δ/2)(Co2/3Ga1/3O1+δ/2)] derived from [AO] rock-salt type layers. The magnetic study shows that the Co3+ cations exhibit a high spin state in this structure. The θp value, −570 K, suggests that antiferromagnetic interactions dominate in this compound as in the brownmillerite cobaltites. Nonetheless, its resistivity ρ300K=10-1Ωcm is lower than that of the brownmillerite compounds. Since the positive Seebeck coefficient indicates the presence of holes (Co4+) in the CoO2 conducting layers, the existence of weak ferromagnetic Co3+–O–Co4+ interactions developing below ≈150 K is proposed to explain the electronic properties of this new oxide." @default.
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• W2082211805 date "2005-03-01" @default.
• W2082211805 modified "2023-09-27" @default.
• W2082211805 title "A new layered cobaltite (Ga1/3Co2/3)2Sr2CoO6+δ with high spin Co3+: modulated structure and physical properties" @default.
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• W2082211805 doi "https://doi.org/10.1016/j.jssc.2004.12.035" @default.
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