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Preparation of Cs—Mn alum and mixed crystals of NH4—Mn—Al alum. Determination of their magnetic susceptibilities. Preparation of Rb—Co alum, its mixed crystals with Rb–Al alum, and mixed crystals of NH4—Co—Al and K—Co—Al alums. These are all diamagnetic.
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J. Zernike (1952) studied this question.
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