High-temperature heat capacity of SPS-processed Y3Al5O12 (YAG) and Nd:YAG

作者：Sagi S; Hayun S^*

来源：Journal of Chemical Thermodynamics, 2016, 93: 123-126.

DOI：10.1016/j.jct.2015.09.035

• Calorimetry
• Heat capacity
• Nd:YAG
• Spark plasma sintering
• Yttrium aluminum garnet

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.

• 出版日期2016-2