Alumina ceramic
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United States of America Patent
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Jun 12, 2012
Grant Date -
Mar 17, 2011
app pub date -
Jun 22, 2009
filing date -
Jun 30, 2008
priority date (Note) -
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Abstract
An alumina ceramic contains a Ba0.808Al1.71Si2.29O8 phase. The alumina ceramic has high reflectivity and is useful as a reflecting material for a light emitting element. The alumina ceramic which exhibits an X-ray diffraction pattern having a ratio of the peak intensity at 2θ=43.3° to that at 22.5° of 0.5 to 2.5 has particularly high reflectivity. The alumina ceramic shows high reflectivity particularly at wavelengths ranging from 300 to 400 nm.
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