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XRD patterns of β-stannic acid (a, b) and α-stannic acid (c) samples. Sample (a) is an air-dried white powder (m = 1.3); translucent sample (b) is obtained by washing perchloric acid from plasticized β-stannic acid (m = 2); sample (c) is a milky - white gel freshly precipitated at 0 °C (m = 6.5).
