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A high‐pressure single‐crystal synchrotron diffraction study of NH

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The crystal structure of ammonium rubidium nonaoxotetratellurate(IV) dihydrate has been studied as a function of pressure up to 7.40 GPa. The ambient‐pressure structure is characterized by the co‐existence of three different Te—O polyhedra (TeO3, TeO4 and TeO5), which are connected to form layers. NH4 +, H2O and Rb+ are incorporated between the layers. Both the Rb1 position, which is located on a twofold axis, and the Rb2 position are partially occupied. The three different types of coordination polyhedra around Te4+ are stable up to at least 5.05 GPa. No phase transition is observed. The fit of the unit‐cell volume as a function of pressure gives a zero‐pressure bulk modulus of 34 (1) GPa with a zero‐pressure volume of V 0 = 2620 (4) Å3 [B′ = 1.4 (2)].

Document Type: Research Article

DOI: http://dx.doi.org/10.1107/S0108270111025728

Publication date: October 15, 2011

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