Phase Equilibria in the Ternary Reciprocal System Li,Rb||F,CrO4


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Chemistry, 2013, Vol. 58, No. 11, pp. 13 561360. Pleiades Publishing, Ltd., 2013 Original Russian Text A.V. Burchakov, E.M. Bekhtereva, I.M. Kondratyuk, 2013, pu blished in Zhurnal Neorganicheskoi Khimii, 20 13, Vol. 58, No. 11, pp. 15111516. GOU VPO Samara State Technical University, Samara, Russia Received March 15, 2013 Abstract The ternary reciprocal system of fluorides and chromates of lithium and rubidium was studied for the first time. The stable pair of salts LiF and and also binary compounds on the bordering sides partition the system into five simplexes. By studying a number of polythermal sections, the melting points and compositions of two peritectics and three eutectics were 1 2 ' 1 1 2 3 Li,Rb||F,CrO to the composition square. RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 58 No. 11 2013 PHASE EQUILIBRIA IN THE TERNARY RECIPROCAL SYSTEM of the system were identified: , LiFRb EXPERIMENTAL The experimental investigation was performed by , 2% LiF, 81% Li (566C, 7% LiF, 45% Li In the stable triangle  + LiF +  + LiF +  + LiF + LiRbCrO LiF + CrO LiF + LiRbCrO LiF + 300 764 400 300 102030405060708090 2 Composition, 700 700 400 20304050 60708090 Composition, Fig. 3. diagram of the polythermal section LiF RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 58 No. 11 2013 700 700 20304050 60708090 Composition, 400 700 400 r760 CrO s630 L + LiF + 2 3 K10 20304050 60708090 u682 Composition, equiv % 465 diagram of the polythermal section KRbF. RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 58 No. 11 2013 PHASE EQUILIBRIA IN THE TERNARY RECIPROCAL SYSTEM 783 700 400 465 700 2 20304050 60708090 Composition, equiv % Fig. 6. diagram of the polythermal section 700 700 20304050 60708090 Composition, equiv % Fig. 7. diagram of the polythermal section 500 400 700 400 20304050 60708090 Composition, equiv RUSSIAN JOURNAL OF INORGANIC CHEMISTRY Vol. 58 No. 11 2013 RESULTS AND DISCUSSION The liquidus surface of the ternary reciprocal sys Li,Rb||F,CrO consists of seven crystallization fields: the ones of lithium fluoride, rubidium fluoride, lithium chromate, rubidium chromate, and binary compounds equilibria in the system. In the simplexes of melting of the compound within the ternary reciprocal system changes from congruent to incon gruent. Because of this, in the simplex there is ternary peritectic point 505 , and in the sim , there is no invariant phase equilibrium. In the stable triangle 1.V. S. Bagotskii and A. M. Skundin, Chemical Power (Energoizdat, Moscow, 1981) [in Russian]. 2.M. A. Dibirov, N. N. Verdiev, and I. K. Garkushin, HeatStorage Fluoride Salt Mixtures , Available from 3.E. N. Storchai, Svar. Proizvod., No. 4, 55 (1975). 4.A. N. Baraboshkin, Diagram elementsPhase equilibria PointsInvariant L LiF + L LiF + L RbF + aD L + LiF L + LiF LinesMonovariant L LiF + Li L LiF + D L LiF + Rb L LiF + D L D L RbF + D L Rb L Li L Rb L LiF + D L D SPELL: 1. chromates, 2. multicomponent

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