ESTIMATION AND REVISION OF SOME THERMODYNAMIC DATA IN THE YBACUO SYSTEM .2. STANDARD ENTROPIES OF FORMATION

Authors
MOISEEV G VATOLIN N SESTAK J
Citation
G. Moiseev et al., ESTIMATION AND REVISION OF SOME THERMODYNAMIC DATA IN THE YBACUO SYSTEM .2. STANDARD ENTROPIES OF FORMATION, Thermochimica acta, 237(2), 1994, pp. 401-407
Citations number
22
Categorie Soggetti
Chemistry Analytical
Journal title
Thermochimica acta → ACNP
ISSN journal
00406031
Volume
237
Issue
2
Year of publication
1994
Pages
401 - 407
Database
ISI
SICI code
0040-6031(1994)237:2<401:EAROST>2.0.ZU;2-D
Abstract
From a review of the literature data, we have estimated the basic stan dard entropies of formation from the elements S298formalBAR of YBa2Cu3 O7 (123-O7), YBa2Cu3O6 (123-O6), YBa2Cu4O8 (124-O8), YBa2Cu3.5O7.5 (12 3.5-07.5), YCuO2 (101) and Y2Cu2O5 (202). It is shown that for the S29 8formal(i) estimation, it is better to use the method of increments of the ions constituting the compound, rather than the method of additio n of standard entropies of the simple oxides forming the compound. In addition, S298formal values were calculated for YBa2Cu5O9 (125-O9), YB a4Cu3O8.5 (143-O8.5), BaCuO2 (011), BaCu2O2 (012), Ba2CuO3 (021), Ba3C uO4 (031), Y2BaCuO5 (211), Y2BaO4 (210), Y2Ba4O7 (240) and Y2Ba2O5 (22 0).