Crystal Growth and TG-DTA Properties of K2Ln(NO3)5.2H2O(Ln=La, Ce, Pr, Nd, Sm)

Abstract

Abstract: Single crystals of KLnN(Ln=La, Ce, Pr, Nd, Sm) can be grown in water solution with pH≈1～2 at about 40℃. Crystals of KLnN
(Ln=La, Ce, Pr, Nd) are orthorhombic with space group Fdd2. KPrN crystal was grwon and its crystal structure was determined for the first time.
The KPrN crystal parameters obtained by the direct method are as follows: a=21.411(3)A, b=11.2210(10)A, c=12.208(2)A, Z=6, R=0.0240. The TG-DTA curves of KLnN(Ln=
La, Ce, Pr, Nd, Sm) demonstrate that the processes of dehydration , melt, irreversible phase transition and decomposition of NO^-₃ take place in sequence with the temperature increasing(except KCN). There are three steps in the
decomposition of NO^-₃ in KLnN(Ln=La, Nd, Sm) while two steps in KLnN(Ln=Ce, Pr). K₂Ln(NO₃)₅·2H₂O are formed at about 225℃
by the reaction of the starting materials of KNO₃and Ln(NO₃)₃·nH₂O.

Key words: rare earth, potassium lanthanide nitrate hydrate, crystal growth,TG-DTA

CLC Number:

DONG Wen-Ting,ZHANG Hong-Jie,SU Qiang. Crystal Growth and TG-DTA Properties of K₂Ln(NO₃)₅.2H₂O(Ln=La, Ce, Pr, Nd, Sm)[J]. Journal of Inorganic Materials.

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Crystal Growth and TG-DTA Properties of K₂Ln(NO₃)₅.2H₂O(Ln=La, Ce, Pr, Nd, Sm)

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