Solid Solutions of Double Phosphate Hexahydrates
in the MgNH₄PO₄ 6H₂ONi²⁺H₂O System
and Their Dehydration Products

V. V. Vol’khin, M. Yu. Siluyanova, G. V. Leont’eva, and D. A. Kazakov

Perm National Polytechnic University, Perm, Russia

e-mail: vvv@purec.pstu.ac.ru

Received October 21, 2013

Abstract—Substitutional solid solutions Mg²⁺ Ni²⁺ of crystal hydrates Mg_(1–x)Ni_xNH₄PO₄ 6H₂O and
Mg_(1–x)Ni_xNH₄PO₄ H₂O (where 0 < x 0.65), which have struvite structure and dittmarite structure, respec-
tively, have been studied. Ion exchange Mg²⁺ Ni²⁺ influences the condition of M²⁺–H₂O (M²⁺ = Mg²⁺, Ni²⁺)
coordination bonds and hydrogen bonds involving coordinated H₂O molecules, as probed by Xray powder dif-
fraction, thermal analysis, and FTIR spectroscopy. The coordination of water molecules to metal ions in those
crystal hydrates is treated to be a factor that determines the propensity of the resulting crystal structures to poly-
morphism.

DOI: 10.1134/S0036023614100210

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