ENTHALPIES AND HEAT-CAPACITIES OF LI2SIO3 AND LI2ZRO3 BETWEEN 298 AND1400 K BY DROP CALORIMETRY

Authors
KLEYKAMP H
Citation
H. Kleykamp, ENTHALPIES AND HEAT-CAPACITIES OF LI2SIO3 AND LI2ZRO3 BETWEEN 298 AND1400 K BY DROP CALORIMETRY, Thermochimica acta, 237(1), 1994, pp. 1-12
Citations number
17
Categorie Soggetti
Chemistry Analytical
Journal title
Thermochimica acta → ACNP
ISSN journal
00406031
Volume
237
Issue
1
Year of publication
1994
Pages
1 - 12
Database
ISI
SICI code
0040-6031(1994)237:1<1:EAHOLA>2.0.ZU;2-I
Abstract
The enthalpies of Li2SiO3 and Li2ZrO3 were measured between 368 and 14 14 K by an isoperibol Setaram HTC 1800 drop calorimeter. The calibrati on procedure is described. The smoothed enthalpies between 298 and 140 0 K are: H(T)degrees - H298-degrees [Li2SiO3] = -51157 + 125.860T + 0. 01713T2 + 3614467T-1 J/mol H(T)degrees - H298-degrees [Li2ZrO3] = -464 53 + 134.857T + 0.00740T2 + 1671251T-1 J/mol The standard deviation is almost-equal-to 3%. The heat capacities were derived by differentiati on. The values extrapolated to 298 K are: C(p,298)[Li2SiO3] = (95.4 +/ - 3.1)J/K mol C(p,298)[Li2ZrO3] = (120.4 +/- 3.0)J/K mol