prov:value
| - The glass ceramic has a composition prepared by adding one to three types of additives which are selected from the group consisting of P2 O5, Li2 O, B2 O3, ZrO2, ZnO, TiO2, and SnO2, to cordierite ceramics (2MgO.2Al2 O3.5SiO2), or a composition prepared by adding P2 O5, BaO, ZnO, K2 O, etc. to ??-spodumene (Li2 O.Al2 O3.4SiO2).
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