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Abstract

The Li₂SeO₄-H₂SeO₄-H₂O and (NH₄)₂SeO₄-Li₂SeO₄-H₂O systems were studied at 30 °C to obtain data for determining the conditions of formation of the compound (NH₄)₄LiH₃(SeO₄)₄, whose characteristics correspond to those of substances possessing significant dielectric properties. The results were used to construct the pseudoternary LiNH₄SeO₄-NH₄HSeO₄ -H₂O section in the quaternary system, which gave evidence that only (NH₄)₃H(SeO₄)₂ forms in the crystallization region of the compound sought. Attention was also paid to lithium ammonium selenate, which was characterized by its X-ray, spectral, and thermal analysis data.