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本文生长出了K2Ln（NO3）5.2H2O（Ln=La；Ce；Pr；Nd；Sm）的单晶，并对其进行了晶体结构及差热-热重分析研究．结果表明，K2Ln（NO3）5.2H2O（Ln=La；Ce；Pr；Nd）的晶体属正交晶系，Fdd2空间群．首次生长出KPrN单晶并用直接法解出其晶体结构．解得KPrN的晶胞参数为：a=11．2210（10）,b=21．411（3），c=12．208（2）,Z=6；R=0．0240．对KLnN加热，则依次出现脱水、熔化、不可逆相变和NO的分解过程（K2Ce（NO3）5·2H2O除外）K2Ln（NO3）5·2H2O（Ln＝La；Nd；Sm）的NO分三步分解，K2Ln（NO3）5·2H。O（Ln=Ce；Pr）的NO分两步分解·KNO3和Ln（NO3）3·nH2O的混合物在225℃左右生成K2Ln（NO3）5
In this paper, a single crystal of K2Ln (NO3) 5.2H2O (Ln = La; Ce; Pr; Nd; Sm) was grown and its crystal structure and DTA- The results show that the crystals of K2Ln (NO3) 5.2H2O (Ln = La; Ce; Pr; Nd) are orthorhombic and Fdd2 space group. The KPrN single crystal was grown for the first time and solved directly for its crystal structure. The unit cell parameters for solving KPrN are: a = 11.2210 (10), b = 21.411 (3), c = 12.208 (2), Z = 6; R = 0.0240. For the heating of KLnN, dehydration, melting, irreversible phase change and NO decomposition (K2Ce (NO3) 5 · 2H2O, in turn) occur in three steps of K2Ln (NO3) 5.2H2O (Ln = La; Nd; Sm) Decomposition, K2Ln (NO3) 5 · 2H. NO (Ln = Ce; Pr) is decomposed in two steps. · A mixture of KNO3 and Ln (NO3) 3 · nH2O generates K2Ln (NO3) 5