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Results for DC.creator="D." AND DC.creator="Pandey" in section 9.2.1 of volume C page 1 of 3 pages. |
Layer stacking in close-packed structures
International Tables for Crystallography (2006). Vol. C, Section 9.2.1, pp. 752-760 [ doi:10.1107/97809553602060000618 ]
... tetrahedron formed by the centres of spheres; (c) octahedral void; (d) octahedron formed by the centres of spheres. (ii) If the ... layer, the resulting voids are called octahedral voids (Figs. 9.2.1.3c,d) since the six spheres surrounding each such void lie at ... octahedral voids is equal to the number of spheres (Krishna & Pandey, 1981). 9.2.1.2.2. Structures of SiC and ZnS | | SiC ...
Stacking faults in close-packed structures
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.8, pp. 758-760 [ doi:10.1107/97809553602060000618 ]
... and certain iron-based alloys (Andrade, Chandrasekaran & Delaey, 1984; Kabra, Pandey & Lele, 1988a; Nishiyama, 1978; Pandey, 1988). The classical method of classifying stacking faults in ... of formation, the reader is referred to the articles by Pandey (1984a) and Pandey & Krishna (1982b). Frank (1951) has ...
Determination of the stacking sequence of layers
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.4, pp. 757-758 [ doi:10.1107/97809553602060000618 ]
... polytypism for the origin of polytype structures (for details see Pandey & Krishna, 1983). The most probable series of structures as ... 2, 3, 4, 5 and 6 in their Zhdanov sequence (Pandey & Krishna, 1975, Pandey & Krishna, 1976a). For CdI2 and PbI2 polytypes, the ...
Determination of the identity period
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.3, p. 757 [ doi:10.1107/97809553602060000618 ]
Determination of the identity period 9.2.1.7.3. Determination of the identity period The number of layers, n, in the hexagonal unit cell can be found by determining the c parameter from the c-axis rotation or oscillation photographs and dividing this by the layer spacing h for that compound which can be ...
Determination of the lattice type
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.2, p. 757 [ doi:10.1107/97809553602060000618 ]
Determination of the lattice type 9.2.1.7.2. Determination of the lattice type When the structure has a hexagonal lattice, the positions of spots are symmetrical about the zero layer line on the c-axis oscillation photograph. However, the intensities of the reflections on the two sides of the zero layer line are ...
General considerations
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.1, p. 756 [ doi:10.1107/97809553602060000618 ]
General considerations 9.2.1.7.1. General considerations The different layer stackings (polytypes) of the same material have identical a and b parameters of the direct lattice. The a*b* reciprocal-lattice net is therefore also the same and is shown in Fig. 9.2.1.9 . The reciprocal lattices of these polytypes differ only along ...
Structure determination of close-packed layer stackings
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7, pp. 756-758 [ doi:10.1107/97809553602060000618 ]
... polytypism for the origin of polytype structures (for details see Pandey & Krishna, 1983). The most probable series of structures as ... 2, 3, 4, 5 and 6 in their Zhdanov sequence (Pandey & Krishna, 1975, Pandey & Krishna, 1976a). For CdI2 and PbI2 polytypes, the ...
Crystallographic uses of Zhdanov symbols
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.6, p. 756 [ doi:10.1107/97809553602060000618 ]
... of identical Zhdanov symbols has been abandoned in recent years (Pandey & Krishna, 1982a). Thus the 15R polytype of SiC is ... actual examples of homometric structures. Acta Cryst. A33, 257-260. Pandey, D. & Krishna, P. (1982a). Polytypism in close-packed structures. ...
Possible space groups
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.5, pp. 755-756 [ doi:10.1107/97809553602060000618 ]
Possible space groups 9.2.1.5. Possible space groups It was shown by Belov (1947) that consistent combinations of the possible symmetry elements in close packing of equal spheres can give rise to eight possible space groups: P3m1, , , , , R3m, , and Fm3m. The last space group corresponds to the special case of cubic close ...
Possible lattice types
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.4, p. 755 [ doi:10.1107/97809553602060000618 ]
Possible lattice types 9.2.1.4. Possible lattice types Close packings of equal spheres can belong to the trigonal, hexagonal, or cubic crystal systems. Structures belonging to the hexagonal system necessarily have a hexagonal lattice, i.e. a lattice in which we can choose a primitive unit cell with , [alpha] = [beta] = 90°, and [gamma ...
International Tables for Crystallography (2006). Vol. C, Section 9.2.1, pp. 752-760 [ doi:10.1107/97809553602060000618 ]
... tetrahedron formed by the centres of spheres; (c) octahedral void; (d) octahedron formed by the centres of spheres. (ii) If the ... layer, the resulting voids are called octahedral voids (Figs. 9.2.1.3c,d) since the six spheres surrounding each such void lie at ... octahedral voids is equal to the number of spheres (Krishna & Pandey, 1981). 9.2.1.2.2. Structures of SiC and ZnS | | SiC ...
Stacking faults in close-packed structures
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.8, pp. 758-760 [ doi:10.1107/97809553602060000618 ]
... and certain iron-based alloys (Andrade, Chandrasekaran & Delaey, 1984; Kabra, Pandey & Lele, 1988a; Nishiyama, 1978; Pandey, 1988). The classical method of classifying stacking faults in ... of formation, the reader is referred to the articles by Pandey (1984a) and Pandey & Krishna (1982b). Frank (1951) has ...
Determination of the stacking sequence of layers
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.4, pp. 757-758 [ doi:10.1107/97809553602060000618 ]
... polytypism for the origin of polytype structures (for details see Pandey & Krishna, 1983). The most probable series of structures as ... 2, 3, 4, 5 and 6 in their Zhdanov sequence (Pandey & Krishna, 1975, Pandey & Krishna, 1976a). For CdI2 and PbI2 polytypes, the ...
Determination of the identity period
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.3, p. 757 [ doi:10.1107/97809553602060000618 ]
Determination of the identity period 9.2.1.7.3. Determination of the identity period The number of layers, n, in the hexagonal unit cell can be found by determining the c parameter from the c-axis rotation or oscillation photographs and dividing this by the layer spacing h for that compound which can be ...
Determination of the lattice type
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.2, p. 757 [ doi:10.1107/97809553602060000618 ]
Determination of the lattice type 9.2.1.7.2. Determination of the lattice type When the structure has a hexagonal lattice, the positions of spots are symmetrical about the zero layer line on the c-axis oscillation photograph. However, the intensities of the reflections on the two sides of the zero layer line are ...
General considerations
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7.1, p. 756 [ doi:10.1107/97809553602060000618 ]
General considerations 9.2.1.7.1. General considerations The different layer stackings (polytypes) of the same material have identical a and b parameters of the direct lattice. The a*b* reciprocal-lattice net is therefore also the same and is shown in Fig. 9.2.1.9 . The reciprocal lattices of these polytypes differ only along ...
Structure determination of close-packed layer stackings
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.7, pp. 756-758 [ doi:10.1107/97809553602060000618 ]
... polytypism for the origin of polytype structures (for details see Pandey & Krishna, 1983). The most probable series of structures as ... 2, 3, 4, 5 and 6 in their Zhdanov sequence (Pandey & Krishna, 1975, Pandey & Krishna, 1976a). For CdI2 and PbI2 polytypes, the ...
Crystallographic uses of Zhdanov symbols
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.6, p. 756 [ doi:10.1107/97809553602060000618 ]
... of identical Zhdanov symbols has been abandoned in recent years (Pandey & Krishna, 1982a). Thus the 15R polytype of SiC is ... actual examples of homometric structures. Acta Cryst. A33, 257-260. Pandey, D. & Krishna, P. (1982a). Polytypism in close-packed structures. ...
Possible space groups
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.5, pp. 755-756 [ doi:10.1107/97809553602060000618 ]
Possible space groups 9.2.1.5. Possible space groups It was shown by Belov (1947) that consistent combinations of the possible symmetry elements in close packing of equal spheres can give rise to eight possible space groups: P3m1, , , , , R3m, , and Fm3m. The last space group corresponds to the special case of cubic close ...
Possible lattice types
International Tables for Crystallography (2006). Vol. C, Section 9.2.1.4, p. 755 [ doi:10.1107/97809553602060000618 ]
Possible lattice types 9.2.1.4. Possible lattice types Close packings of equal spheres can belong to the trigonal, hexagonal, or cubic crystal systems. Structures belonging to the hexagonal system necessarily have a hexagonal lattice, i.e. a lattice in which we can choose a primitive unit cell with , [alpha] = [beta] = 90°, and [gamma ...
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