Five fields corresponding to the primary crystallization of PrCl_3,Sr_3PrCl_9,α(SrCl_2, CaCl_2),α_1(CaCl_2,SrCl_2)and α_2(SrCl_2,CaCl_2)respectively,six univariant lines related to the secondary crystallization,one...Five fields corresponding to the primary crystallization of PrCl_3,Sr_3PrCl_9,α(SrCl_2, CaCl_2),α_1(CaCl_2,SrCl_2)and α_2(SrCl_2,CaCl_2)respectively,six univariant lines related to the secondary crystallization,one ternary eutectic(48.0 wt-％ PrCl_3,23.5 wt-％ SrCl_2; 590℃)and ternary peritectic point(45.5 wt-％ PrCl_3,24.5 wt-％ SrCl_2;614℃) were determined by DTA.Attempts were also made to explore the rule governing the alteration in the phase diagram containing rare earth chloride,formation of compound and its stability by means of polarization and counter-polarization.展开更多
Thermodynamic study on the reaction PrCl 3(s) +( x /2) Al 2Cl 6(g) =PrAl x Cl 3 x +3(g) was carried out by quenching experiments within 604～827 K and 0 05～0 15 MPa. The results suggested that...Thermodynamic study on the reaction PrCl 3(s) +( x /2) Al 2Cl 6(g) =PrAl x Cl 3 x +3(g) was carried out by quenching experiments within 604～827 K and 0 05～0 15 MPa. The results suggested that the PrAl 3Cl 12(g) complex was the predominant species. The equilibrium constants of the reaction were measured. The reaction enthalpy and entropy derived from the measurements were ΔH 0 298 =(38 2±2) kJ·mol -1 and ΔS 0 298 =(1 2±3) J·mol -1 ·K -1 .展开更多
文摘Five fields corresponding to the primary crystallization of PrCl_3,Sr_3PrCl_9,α(SrCl_2, CaCl_2),α_1(CaCl_2,SrCl_2)and α_2(SrCl_2,CaCl_2)respectively,six univariant lines related to the secondary crystallization,one ternary eutectic(48.0 wt-％ PrCl_3,23.5 wt-％ SrCl_2; 590℃)and ternary peritectic point(45.5 wt-％ PrCl_3,24.5 wt-％ SrCl_2;614℃) were determined by DTA.Attempts were also made to explore the rule governing the alteration in the phase diagram containing rare earth chloride,formation of compound and its stability by means of polarization and counter-polarization.
文摘Thermodynamic study on the reaction PrCl 3(s) +( x /2) Al 2Cl 6(g) =PrAl x Cl 3 x +3(g) was carried out by quenching experiments within 604～827 K and 0 05～0 15 MPa. The results suggested that the PrAl 3Cl 12(g) complex was the predominant species. The equilibrium constants of the reaction were measured. The reaction enthalpy and entropy derived from the measurements were ΔH 0 298 =(38 2±2) kJ·mol -1 and ΔS 0 298 =(1 2±3) J·mol -1 ·K -1 .
