| abstract |
10≤ Al 2 O 3 ≤50 mol% ; 12? K 2 O? 40 mol%; 30 ≤ SiO 2 ≤70 mol%; And SiO 2 + Al 2 O 3 + K 2 O ≥ 80 mol%, comprising: an amount of a nucleation-promoting component effective to promote bulk crystallization in the glass; And / or by providing a potassium scavenger material on at least a portion of the surface of the fibers. |