Thermodynamic Functions of Congruently Melting Compounds Formed in the CeBr₃−KBr Binary System

Abstract

The heat capacity of the congruently melting compounds K2CeBr5 and K3CeBr6 was measured by differential scanning calorimetry in the temperature range from 400 K up to 1100 K. A linear heat capacity dependence on temperature was used to fit the experimental data. Through combination of these results with the entropy at 298.15 K, and enthalpies of phase transitions, the thermodynamic functions of K2CeBr5 and K3CeBr6 were calculated up to T = 1100 K.

Thermodynamic Properties of AgCl and AgBr

“…Experimental monitoring, data acquisition, and processing were performed with the Setaram Setsys software. As mentioned previously 18 the Setaram DSC 121 apparatus was calibrated by the Joule effect, and some test measurements were performed separately with NIST 720 R-Al 2 O 3 Standard Reference material prior to investigation. These tests resulted in C p,m values consistent with standard data for Al 2 O 3 (difference less than 1.5 %), with the exception on the temperature range (300 to 370) K, in which measured values were significantly larger.…”

Thermodynamic Functions of CeBr3 and Congruently Melting M3CeBr6 Compounds (M = Rb, Cs)

“…The stability of these compounds depends on the nature both of the cations (lanthanide Ln, alkali M) and of the halide X. – We have paid much attention to the M 3 LnX 6 stoichiometric compounds that exist in most of the LnX 3 −MX systems and have a more extended stability range than those of different stoichiometry. These congruently melting compounds were found – to exist also in the CeBr 3 −MBr systems (M = K, Rb, and Cs). The thermodynamic properties of the K 3 CeBr 6 potassium compound have been characterized previously .…”

Phase Diagram and Thermodynamic and Transport Properties of the DyBr3-LiBr Binary System

“…This so-called ''step method,'' has been described [4][5][6] previously. The same operating conditions (i.e., initial and final temperatures, temperature increment, isothermal delay, and heating rate) were used in all experimental series.…”