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

S. Sagi, S. Hayun

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)123-126
Number of pages4
JournalJournal of Chemical Thermodynamics
Volume93
DOIs
StatePublished - 1 Feb 2016

Keywords

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

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science (all)
  • Physical and Theoretical Chemistry

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