High-temperature neutron diffraction of the AIN-Al2O3-Y2O3 system

  1. Get@NRC: High-temperature neutron diffraction of the AIN-Al2O3-Y2O3 system (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1111/j.1151-2916.2003.tb03363.x
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Journal titleJournal of the American Ceramic Society
Pages717726; # of pages: 10
Subjecthigh temperature; aluminum nitride; aluminum oxide
AbstractThe importance of aluminum nitride (AlN) stems from its application in microelectronics as a substrate material due to high thermal conductivity, high electrical resistance, mechanical strength and hardness, thermal durability, and chemical stability. Yttria (Y2O3) is the best additive for AlN sintering. AlN densifies by a liquid-phase mechanism, where the surface oxide, Al2O3, reacts with Y2O3 to form an Y-Al-O-N liquid that promotes particle rearrangement and densification. Construction of the phase relations in this multicomponent system is essential for optimizing the properties of AlN. The ternary phase diagram of the AlN–Al2O3–Y2O3 was developed by Gibbs energy minimization using interpolation procedures based on modeling the binary subsystems. This paper aims at testing the resultant understanding experimentally at selected compositions using in situ high-temperature neutron diffractometry. These experimental results agree with the thermodynamic calculations of AlN–Al2O3–Y2O3. The ternary phase diagram has been constructed for the first time in this work. High-temperature neutron diffractometry has permitted real time measurement of the reactions involved in this ternary system, especially to determine the temperature range for each reaction, which would have been difficult to establish by other means.
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AffiliationNational Research Council Canada; NRC Canadian Neutron Beam Centre
Peer reviewedNo
NPARC number12339022
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Record identifiereabdf4c2-7d3a-400e-bc98-50a409159ec4
Record created2009-09-11
Record modified2016-05-09
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