Solid Solution Effects on the Thermal Properties in the MgAl₂O₄-MgGa₂O₄ System


Solid solution effects on thermal conductivity within the MgO-Al2O3-Ga2O3 system were studied. Samples with systematically varied additions of MgGa2O 4-MgAl2O4 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 MgAl2O4-MgGa2O4 system decreases the thermal conductivity up to 1000°C. At 200°C thermal conductivity decreased 24% with a 5 mol% addition of MgGa2O4 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% MgGa2O4 considered across a 12 inch thickness.


Materials Science and Engineering

Keywords and Phrases

Laser flash techniques; MgAl; Room temperature; Solution effects, Differential scanning calorimetry; Heat flux; Solid solutions, Thermal conductivity

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version


File Type





© 2013 The American Ceramic Society, All rights reserved.

Publication Date

01 Mar 2013