| 摘要 |
PROBLEM TO BE SOLVED: To reduce the lightness of AlN and to make the color nearly black without adding a metal compd. such as a sintering aid or a blackening agent, especially a heavy metal compd. to the AlN. SOLUTION: The g-value of unpaired electrons in this AlN in its spectrum by an electron spin resonance method is >=2.0010, preferably >=2.0040, Al-Al bonds have been formed in the principal crystal phase of the AlN and the AlN has a subsidiary crystal phase made of AlON besides the principal crystal phase. In the spectrum, spin per unit mg of Al is <=5×10<12> spin/mg. |
