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Ba2Ti2(Fe1−xCrx)2As4O (0 ≤ x ≤ 8%) compounds are synthesized by solid-state reaction and their structure and superconductivity are studied with x-ray diffraction, electric resistivity, and magnetization measurements. It is observed that the Cr dopants in the Fe site of Ba2Ti2Fe2As4O expand the lattice constants, but do not cause any structure phase transition. Superconducting transition temperature...
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