Symmetry of reflexion intensity 10.L. and its connection with the notation of layer sequence of Cdl2 polytypes for a structure analysis application
Abstract
A structure analysis of those polytypes of cadmium iodide which have been identified was carried out and a convention for the Zhdanov notation of this structure was proposed. The possibility of dividing all CdI2 polytypes into four groups characterized by different types of symmetry of 10. L and 10. L reflection intensities is given. In order to establish regularities in structure of different groups of polytypes, a new method of symbolical description for polytypic structures in crystals of MX2 compounds is proposed. The description of structure based on defining three-ion layers I–Cd —I as fundamental units of CdI2 crystals structure enables a unique description of these structures. It was also established that the relative intensity of chosen reflections depends on the layer sequence for some hexagonal polytypes. The parameter α, describing the ratio of the “ + ” and “ + ” symbols in the Hägg notation, can be calculated from the number of layers in the unit cell for rhombohedral polytypes.
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Articles in the same Issue
- Fritz Laves 27.2.1906–12.8.1978
- Similarity and miscibility of inorganic crystals*
- Symmetry of reflexion intensity 10.L. and its connection with the notation of layer sequence of Cdl2 polytypes for a structure analysis application
- The crystal structure of Görgeyite K2SO4 · 5 CaSO4 H2O
- An X-ray diffraction study of barium thiosulphate monohydrate, BaS2O3 · H2O
- Tourmaline as a pyroelectric infra-red radiation detector
- Die Bestimmung der Al/Si-Verteilung mittels Neutronenbeugung in einem Plagioklas An66
- Crystal structure of sapphirine-lTc
- X-ray topographic and ferroelastic studies of 2MC-Sb5O7J single crystals
- Die Kristallstrukturen von Li3Ni20B6 und Li~3Ni16B~8
- Darstellung und Kristallstruktur der ternären Boride SrNi12B6 und BaNi12B6
- The crystal structure of chalcophyllite
- Powder diffraction studies on aluminite and meta-aluminite
- Back-reflection precession camera, a new instrument in reciprocal-lattice photography
- A preliminary report on the structure of ZnMn3O7
- Crystal data for 2-(p-bromophenyl)-trans-5,6pentamethyl-2,3,4,6-tetrahydro-l,3-oxazin-4 on C15H18BrNO2 and 2-(p-bromophenyl)trans-4a,5,6,7,8,8a-hexahydrochinazolin-4(3H) on C14H15BrN2O
- The crystal structure of Ba2Ni9B6
- Redetermination of the structure of anhydrous zinc metaborate Zn4O(BO2)6
Articles in the same Issue
- Fritz Laves 27.2.1906–12.8.1978
- Similarity and miscibility of inorganic crystals*
- Symmetry of reflexion intensity 10.L. and its connection with the notation of layer sequence of Cdl2 polytypes for a structure analysis application
- The crystal structure of Görgeyite K2SO4 · 5 CaSO4 H2O
- An X-ray diffraction study of barium thiosulphate monohydrate, BaS2O3 · H2O
- Tourmaline as a pyroelectric infra-red radiation detector
- Die Bestimmung der Al/Si-Verteilung mittels Neutronenbeugung in einem Plagioklas An66
- Crystal structure of sapphirine-lTc
- X-ray topographic and ferroelastic studies of 2MC-Sb5O7J single crystals
- Die Kristallstrukturen von Li3Ni20B6 und Li~3Ni16B~8
- Darstellung und Kristallstruktur der ternären Boride SrNi12B6 und BaNi12B6
- The crystal structure of chalcophyllite
- Powder diffraction studies on aluminite and meta-aluminite
- Back-reflection precession camera, a new instrument in reciprocal-lattice photography
- A preliminary report on the structure of ZnMn3O7
- Crystal data for 2-(p-bromophenyl)-trans-5,6pentamethyl-2,3,4,6-tetrahydro-l,3-oxazin-4 on C15H18BrNO2 and 2-(p-bromophenyl)trans-4a,5,6,7,8,8a-hexahydrochinazolin-4(3H) on C14H15BrN2O
- The crystal structure of Ba2Ni9B6
- Redetermination of the structure of anhydrous zinc metaborate Zn4O(BO2)6
