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Solid Solution Effects on the Thermal Properties in the MgAl 2 O 4 – MgGa 2 O 4 System
Author(s) -
Wilkerson K. R.,
Smith J. D.,
Sander T. P.,
Hemrick J. G.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12125
Subject(s) - thermal diffusivity , thermal conductivity , differential scanning calorimetry , analytical chemistry (journal) , solid state , laser flash analysis , materials science , thermal , mineralogy , chemistry , thermodynamics , composite material , chromatography , physics
Solid solution effects on thermal conductivity within the MgO – Al 2 O 3 – Ga 2 O 3 system were studied. Samples with systematically varied additions of MgGa 2 O 4 – MgAl 2 O 4 were prepared and the laser flash technique was used to determine thermal diffusivity at temperatures between 200°C and 1300°C. Heat capacity as a function of temperature from room temperature to 800°C was also determined using differential scanning calorimetry ( DSC ). Solid solution in the MgAl 2 O 4 – MgGa 2 O 4 system decreases the thermal conductivity up to 1000°C. At 200°C thermal conductivity decreased 24% with a 5 mol% addition of MgGa 2 O 4 to the system. At 1000°C, the thermal conductivity decreased 13% with a 5 mol% addition. Steady‐state calculations showed a 12.5% decrease in heat flux with 5 mol% MgGa 2 O 4 considered across a 12 inch thickness.