Table 1.

Elemental analysis of prepared material, MMT and Al-MMT.

Sample	Component (wt.%)
	Na2O	MgO	SiO2	Al2O3	ZrO2
MMT	8.33	2.82	59.80	27.33	nd
Al-MMT	5.21	1.38	51.52	38.2	nd
10Zr	2.21	0.32	50.45	37.88	1.92
20Zr	1.19	0.31	49.57	36.05	2.21
40Zr	1.17	0.38	48.06	32.32	3.09
60Zr	1.14	0.39	47.89	35.99	7.16