Abstract
This chapter examines aluminum (Al) ordering in a dachiardite framework based on the structural data and 29 Si magic angle spinning nuclear magnetic resonance (MAS NMR) spectra. Obtained ordered distribution model of dachiardite contains four Al atoms per unit cell, and its space group is P2/m instead of the conventional C2/m. Al atoms are located on T3 and T4 sites, which construct four rings. Because Al content in a mined sample is larger than four, small amount of silicon (Si) atoms should be substituted by Al atoms and some extent of Al atoms move to another site to satisfy the Loewenstein's rule. Simulated NMR spectrum based on this substitution is in excellent agreement with the observed ones.
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