Patent ID: 6284340
Filing Date: 2001-09-04
Classification: C03C,G11B,Y10S,Y10T

Abstract:
A crystallized glass, which has a main crystal phase of petalite (Li.sub.2 O.Al.sub.2 O.sub.3.8SiO.sub.2) phase and lithium disilicate (Li.sub.2 O.2SiO.sub.2) phase and an auxiliary crystal phase of .alpha.-quartz phase, comprising a crystal phase composition measured by Rietvelt method of:20 wt %.ltoreq.petalite phase.ltoreq.40 wt %,25 wt %.ltoreq.lithium disilicate phase.ltoreq.45 wt %, and10 wt %.ltoreq..alpha.-quartz phase.ltoreq.25 wt %.