The Chemistry of Simple Ceramic Glazes III: A MASNMR Study of Simulated Feldspars

Author: Arvind-Pal Singh Mandair

Link: “The Chemistry of Simple Ceramic Glazes III: A MASNMR Study of Simulated Feldspars”, Polyhedron: International Journal of Inorganic & Organometallic Chemistry, Vol. 9, No. 14, pp 1709-1716, 1990

About: The influence of additions of CaO, SrO, BaO or Li2O to a synthetic albite feldspar glass was investigated by 29Si, 27Al and 23Na MASNMR spectroscopy. All oxides induce more ordering of the “SiO4”, “AlO4” tetrahedra in the glass when present in greater (CaO > 60 mol % relative to SiO2) or lesser (Li2O > 30 mol %) proportions. Larger additions of CaO (80, 100 mol %) induced crystallization of calcium silicate phases but similar additions of SrO or BaO stabilized the glass phase. 27Al MASNMR data suggested that large additions of CaO caused the separation of an aluminate phase; the data also revealed the presence of octahedral Al3+ sites for all additions of MO (M = Ca, Sr, Ba), however, no octahedral aluminium was seen in the presence of LiO2. The apparent 23Na chemical shift generally moved to lower field as the proportion of “AlO4” in the glass increased.

Contact

Arvind-Pal S. Mandair
Associate Professor of Sikh Studies

Philosophy/Religion/Postcolonial Theory/Sikh Studies/South Asian Studies

Email: amandair@umich.edu
Phone: 734.763.6307
Office: 202 South Thayer Street
Office 6155
Ann Arbor, MI 48104-1608

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