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Measured optical and electronic properties of Mg-rich MgG-3+xTM1−xNG-2 materials. (A) Experimental optical absorption spectra exhibit absorption onsets in the visible range. The horizontal dashed line indicates absorptivity of 104 cm−1. (B) Semiconducting behavior is supported by an exponential increase in resistivity with decreasing temperature. The vertical dashed line indicates a switch in measurement conditions at ∼200 K.
