The structure of zeolite ZSM-23 (MTT) refined from synchrotron X-ray powder data

The structure of zeolite ZSM-23 (structure-type code MTT) loaded with NH₄F [a_o = 11.129 (1), b_o = 5.025 (1) and C_o = 21.519 (1) Å and β = 89.85 (4)°] was refined from high-resolution synchrotron X-ray powder data. The Rietveld refinement converged in space group P12₁1 (No. 4) to R_F = 0.090 and R_wp = 0.085, confirming the proposed model of the silicate framework. The use of complementary methods (synchrotron X-ray powder diffraction, ²⁹Si magic angle-spinning nuclear-magnetic-resonance spectroscopy, and distance and angle least-squares refinements) was essential for the determination of the true space-group symmetry, a prerequisite for the successful Rietveld structure refinement.

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