The molar heat capacity of spark plasma sintering-processed YAG and Nd:YAG (1 at.% Nd) and of single crystal Nd:YAG (1.1 at.% Nd) was evaluated by differential scanning calorimetry from between 298 K and 1623 K. The heat capacity data were fitted to an a + bT + CT(-1) relation. As-sintered SPS samples exhibited lower heat capacity values than did the single crystal. To examine the influence of possible defects created within the SPS apparatus on heat capacity, post-sintering heat treatment at 1673 K in 101.3 kPa of oxygen was applied to the SPS samples. Such treatment resulted in a heat capacity increment close to that obtained for the single crystal, probably due to annealing of the above-mentioned defects. The measured heat capacities of the studied materials were in good agreement with values calculated according to the Neumann Kopp relation for mixed oxides.
Compounds
#
Formula
Name
1
Al5O12Y3
aluminum yttrium oxide (Al5Y3O12)
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.
Type
Compound-#
Property
Variable
Constraint
Phase
Method
#Points
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Crystal
Temperature, K; Crystal
Pressure, kPa; Crystal
Crystal
Small sample (50 mg) DSC
15
POMD
1
Molar heat capacity at constant pressure, J/K/mol ; Crystal