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. 2015 Oct 15;5:15201. doi: 10.1038/srep15201

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(a) Schematic of AB₂O₄ inverse spinel with Oxygen anions connecting the BO₄ tetrahedra and A/BO₆ octahedra. (b) Room temperature x-ray diffractogram of insulating NiCo₂O₄ film grown on MgAl₂O₄(100) substrate. Corresponding Reciprocal Space Map around the (206) reflection is shown in the inset. (c) Cross-sectional HRTEM image of NCO/MAO with selected area diffraction patterns along the [100] zone axis and (d) The P-T phase diagram of NCO.