Phase transformations in the KNd(SO4)2 ∙ H2O–SrSO4 ∙ 0.5H2O system when heated to a temperature of 1000°C

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Abstract

X-ray phase and thermogravimetric analysis methods established the existence of 3 crystalline hydrate modifications, having the composition KNd(SO4)2 ∙ H2O and parameters of their elementary cells are defined. Dehydration in the heating process of KNd(SO4)2 ∙ H2O at a temperature of 250°C leads to the formation of a partially dehydrated modification of the approximate composition of KNd(SO4)2 ∙ 0.2H2O. Further heating to 400°C completes the complete dehydration with formation of the anhydrous monoclinic modification KNd(SO4)2. The high-temperature triclinic modification KNd(SO4)2 exists in the temperature range 635–900°C and decomposes when heated above 900°C. The trigonal modification KNd(SO4)2 forms solid solutions with the crystalline matrix SrSO4 ∙ 0.5H2O. The anhydrous modification KNd(SO4)2 does not form solid solutions with the anhydrous rhombus modification SrSO4∙

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About the authors

N. N. Bushuev

Mendeleev Russian University of Chemical Technology

Author for correspondence.
Email: nbushuev@muctr.ru
Russian Federation, Moscow, 125047

G. K. Tatosyan

Mendeleev Russian University of Chemical Technology

Email: nbushuev@muctr.ru
Russian Federation, Moscow, 125047

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2. Fig. 1. Thermogram of pure (100%) KNd(SO4)2 ∙ H2O.

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3. Fig. 2. Thermogram of 30% KNd(SO4)2 · H2O + 70% SrSO4 · 0.5H2O.

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4. Fig. 3. Thermogram of 70% KNd(SO4)2 · H2O + 30% SrSO4 · 0.5H2O.

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5. Fig. 4. Thermogram of the anhydrous monoclinic modification of KNd(SO4)2.

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