ChemInform Abstract: REAKTION VON NICKELOXID MIT HAFNIUMDIOXID

Thermodynamic analysis of the ternary La–Ni–O system

“…The pseudobinary section La 2 O 3 -NiO in air contains only one compound, La 2 NiO 4 [50,52], which melts congruently at 1943 K according to Timofeeva and Romanovich [38], while Foëx et al indicated the melting point of La 2 NiO 4 around 2023 K [39]. Both values are in fair agreement taking into account the accuracy of such measurements (±50 K).…”

“…(4) ( Table 4) by fitting the heat capacity measurements of Kyomen et al [22] (Fig. 2) and the entropy obtained by integra- tion from 0 K in conjunction with other data [17,[36][37][38]49]. Note that the magnetic ordering in La 2 NiO 4 is anomalous in the sense that most of the magnetic entropy is consumed in a short-range ordering process over a broad temperature range resulting in a very small peak of C P at T N [23] as shown in Fig.…”

“…section La 2 O 3 -NiO[37,38].Fig. 7shows the calculated La 2 O 3 -NiO phase diagram along with the experimental measurements.…”

Thermodynamic properties of complex oxides in the La–Ni–O system

“…The representation of phase equilibria and thermodynamic properties of the ternary oxides in the La-Ni-O system were contradictory and changed as new data about existed phases appeared [5,6,11,[25][26][27][28][29][30]. The available literature information on the thermodynamic properties and phase equilibria for the La-Ni-O system had been systematically analyzed recently by Zinkevich and Aldinger [31].…”