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- W796162523 abstract " We report diffraction experiments on some representative Fast Ion Conductors. The structures of anhydrous stoichiometric deuterium (DAl 11 O 17 ) and silver (AgAl 11 O 17 ) beta aluminas have each been determined at four temperatures in the range 4 . 2K - 773K using powder neutron diffraction (PND) data. In DAl 11 O 17 , a strong D-O(5) hydroxyl linkage is maintained at all four temperatures .For AgAl 11 O 17 at 4.2K,we have observed, for the first time in metal beta aluminas, a completely ordered cation distribution. The material, which was prepared by a new route, is accurately stoichiometric. At 298K,the silver atoms have become somewhat delocalised and by 773K they are organised in a highly diffuse manner. Single crystal neutron diffraction was used to elucidate the proton distributions in ammonium beta alumina, (NH 4 ) 1.25 Al 11 - 0 17.125 , and the two derivatives (NH 4 ) 0.78 H 0.25 Al 11 0 17 and 'HA1 11 - 0 17 .In the parent compound, the positions and orientations of the two independant (NH + 4 ) species are such that all protons are involved in favourable hydrogen-bonding schemes. In formation of the first derivative, one of these sites becomes completely depopulated. Our results clarify the thermal behaviour of (NH 4 ) 1.25 Al 11 0 17.125 and we propose schemes by which stoichiometric beta aluminas are formed from this precursor and the related (H 3 0) 1+x - Al 11 0 17.+x/2 . The crystal structures of I-Ag 3 PO 4 (25°C and 375°C) , II-Ag 3 PO 4 (650°C) ,II-Na 3 PO 4 (γ) (400°C) and the solid solutions Na 3(1-x) Al x PO 4 are described. The high-temperature forms are considered in relation to the fluorite structure and mechanisms for the ionic conduction of these phases are proposed. A single crystal X-ray diffraction study of β-Ag 2 SO 4 (25°C) reveals that it is isostructural with thenardite, V-Na 2 SO 4 .The high-temperature modifications a-Ag 2 SO 4 (490°C) and α-K 2 SO 4 (620°C) have been characterised using PND data. A PND experiment on silver (I) fluoride confirms that it adopts the rocksalt structure and we find no firm evidence for a significant population of defects." @default.
- W796162523 created "2016-06-24" @default.
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- W796162523 date "1980-01-01" @default.
- W796162523 modified "2023-09-24" @default.
- W796162523 title "Studies on some fast ion conductors" @default.
- W796162523 hasPublicationYear "1980" @default.
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