| | 1 | Author
| HansJoachim Berthold, Wolfgang Ludwig | Requires cookie* | | | Title
| Thermische Zersetzung nichtstöchiometrischer Cäsium-Silber-Gold(III)-Chloride und Darstellung von Mischkristallen zwischen Cs2AgAuCl6 und Cs2Au T Au rri Cl6 Thermal Decomposition of Nonstoichiometric Cesium-Silver-Gold(III)-Chloride and Preparation of Mixed Crystals of Cs2AgAuCl6 and Cs2Au I Au III Cl6  | | | | Abstract
| The thermal decomposition of cesium-silver-gold(III)-chloride Cs2Agi_2Aui+2:/3CI6 with 0 <x < 0.63 at temperatures between 250 and 350 °C yields, under evolution of chlorine, mixed crystals of Cs2AgAuCl6 and Cs2Au I Au III Cl6. The composition of the latter can be described by the formula Cs2Agi_j,Au1/ I Au III Cl6 with y = 2a;/ (3—x). Apart from the formation of the mixed crystals the reaction leads to CsCl as a further phase, and in the case of x < 0.35 also to some Cs2AgAuCl6. Mixed crystals with 0.23 < y < 1, free from additional solid phases, can be obtained from strong hydrochloric acid solutions of Cs2AgAuCl6 and Cs2Au I Au III Cl6, which contain an excess of cesium ions. The mixed crystals are isostructural with Cs2Au I Au III Cl6 (space group I4/mmm). The variation of the lattice constants with increasing silver content confirms that the univalent silver, in contrast to the univalent gold, shows no tendency toward the formation of linear dichloro complexes. Our investigations show that the "tetragonal modification of Cs2AgAuCle", described by Elliott and Pauling and obtained by them by heat treatment of cubic cesium-silver -gold(III)-chloride, is, in fact, C , S2Agi_2/Au2/ I Au III Cl6. | | | |
Reference
| Z. Naturforsch. 35b, 970—975 (1980); eingegangen am 17. April 1980 | | | |
Published
| 1980 | | | |
Keywords
| Cesium-Silver-Gold(III)-Chloride, Thermal Decomposition, Preparation, Lattice Constants | | | |
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| default:Reihe_B/35/ZNB-1980-35b-0970.pdf | | | | Identifier
| ZNB-1980-35b-0970 | | | | Volume
| 35 | |
| 2 | Author
| HansJoachim Berthold, Wolfgang Ludwig | Requires cookie* | | | Title
| Präparative und röntgenographische Untersuchungen über Cäsium-Silber-Gold(III)-Chlorid Preparation and X-ray Investigations of Cesium Silver Gold(III) Chloride | | | | Abstract
| Cesium silver gold(III) chloride has been prepared from hydrochloric acid solutions. The composition of the preparations is variable and depends on the ratio [Au(III)]/[Ag(I)] in solution. It corresponds to the formula Cs2Agi_aAui+a;/3Cl6. In the range 0 < x < 0,64 six crystallographically different phases have been observed. Above x — 0,42 a cubic phase is obtained. The stoichiometric compound Cs2AgAuCl6 is obtained only from solutions with [Au(III)]/[Ag(I)] < 1. Reports in the literature which claim the stoichiometric compound Cs2AgAuCl6 to exist in a cubic and in a tetragonal form cannot be confirmed. Cs2AgAuCl6 crystallizes ortho-rhombically with the lattice constants a = 15,21 A, b= 15,16 A and c= 10,32 A (Z = 8). | | | |
Reference
| Z. Naturforsch. 35b, 651—656 (1980); eingegangen am 7. Februar 1980 | | | |
Published
| 1980 | | | |
Keywords
| Cesium Silver Gold(III) Chloride, Preparation, Chemical Composition, Nonstoichiometric Phases, Lattice Constants | | | |
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| default:Reihe_B/35/ZNB-1980-35b-0651.pdf | | | | Identifier
| ZNB-1980-35b-0651 | | | | Volume
| 35 | |
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