Temperature dependence of refractive index of glassy SiO2 in the infrared wavelength range Original Research Article

Single crystals of K2Ln(NO3)5·2H2O (KLnN) (Ln=La, Ce, Pr, Nd, Sm) were grown from aqueous solution. The thermogravimetric analysis and differential thermal analysis curves of KLnN demonstrate that the processes of dehydration, melting, irreversible phase transformation and decomposition of NO3− take place in sequence in the heating processes (except KCN). There are three stages in the decomposition of NO3− in KLnN (Ln=La, Nd, Sm) while two in KLnN (Ln=Ce, Pr). K2Ln(NO3)5 is formed at about 225°C by the reaction of KNO3 and Ln(NO3)3·nH2O (Ln=La, Ce, Pr, Nd).