✍ Scribed by Patrick M. Woodward; Arthur W. Sleight; Lin-Shu Du; Clare P. Grey
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and two forms of Na 2 GeTeO 6 . All compounds are layered structures based on various stacking arrangements of MTeO 2؊ 6 layers. The structures of BaGeTeO 6 and SrGeTeO 6 were also determined. The former compound was found to contain Ba 2؉ in trigonal prismatic coordination, in agreement with previous literature reports, while SrGeTeO 6 contains Sr 2؉ in octahedral coordination and is not isostructural with BaGeTeO as was previously reported. Structural characterizations were carried out using a variety of tools, including Rietveld re5nements of X-ray and neutron powder di4raction data, solid-state MAS+ NMR, and Raman and infrared spectroscopy. With the exception of M ؍ Ti 4؉ , the MTeO 2؊ 6 layers show a high degree of order between M 4؉ and Te 6؉ cations within the layers, but the stacking faults are generally present, which results in a signi5cant decrease in the long-range ordering of the M 4؉ and Te 6؉ cations in the third dimension. The compound K 2؊x Na x TiTeO 6 was prepared by reacting Na 2 TiTeO 6 and KNO 3 under hydrothermal conditions at 2003C in a Te6on-lined Parr bomb. This compound adopts a pyrochlore structure with cell edge 10.18 A s . NMR measurements indicate a disordered Ti/Te distribution.
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Single crystals of a new bismuth oxyphosphate were isolated and X-ray investigated, leading to the formula Bi 6.67 (PO 4 ) 4 O 4 . Its crystal structure was refined using 2624 independent reflections in the P1 space group, a ؍ 9.195(15) A s , b ؍ 7.552(5) A s , c ؍ 6.933(4) A s , ؍ 112.2(1)°
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