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Powder X-ray diffractograms of GeO2-rGO-20 (a), GeO2-rGO-50 (b), GeO2-rGO-80 (c), Ge3N4-rGO-20 (d), Ge3N4-rGO-50 (e), Ge3N4-rGO-80 (f), GeP-rGO-20 (g), GeP-rGO-50 (h), and GeP-rGO-80 (i) powders. Vertical bars below represent the standard diffraction data for corresponding crystalline germanium compounds.
