Abstract
It is established that a one-layer polytype 1T with the unit-cell parameters a = 3.758, c = 12.135 A, sp. gr. P3m1 and the structure module hThOhThE is mixed with the three-layer polytype 3R with the unit-cell parameters a = 3.758, c = 36.405 A, sp. gr. R3m and the structure module hTcOcThE, where T and O are two-dimensional nets of tetrahedra and octahedra, respectively, E is the empty intermediate layer, and h and c indicate the hexagonal and cubic packings of atomic planes S. The microdiffraction pattern in the hexagonal basis shows a monoclinic superlattice with the parameters \(A = \sqrt {19} a, B = \sqrt {13} a, \gamma = 110.485^\circ\) related to the main hexagonal lattice as A = [520] and \(B = [\bar 130]\).
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