Table 3.

EDX element quantification for glass–ceramic materials (wt%)

Element	PLD	FLD	ZLS
O	53.81	50.64	38.35
Al	0.42	2.51	1.21
Si	34.90	36.60	31.75
P	1.02	1.51	5.37
Zr	5.27	6.10	12.67
Zn	0.92	0.46	-
K	3.67	-	-
Ce	-		2.43
Tb	-	-	1.62