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Conditions of synthesis (temperature, precursors) have been selected to grow crystals of anhydrous lithium and ammonium hypophosphites. The crystal structure of LiH2PO2 has been determined. Cell parameters and atomic positions in (NH4)H2PO2 at room temperature and at 100 K have been refined. By their oxygen atoms the hypophosphite anions serve to bridge the four cations. Each oxygen atom is bonded...
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