Phys. Rev. Lett. 88, 155503 (2002) [4 pages]Structure of Rb-III: Novel Modulated Stacking Structures in Alkali MetalsReceived 31 January 2002; published 1 April 2002 The crystal structure of Rb-III, stable between 13 and 17 GPa, has been determined from quasi-single-crystal x-ray diffraction data. It is orthorhombic, space group C2221, with 52 atoms in the unit cell, and has an 8-10-8-8-10-8 stacking of 8- and 10-atom layers. The recently reported 84-atom structure of Cs-III can be understood as an 8-8-10-8-8-8-8-10-8-8 stacking of the same layers. These represent a new class of modulated elemental structures. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.155503
DOI:
10.1103/PhysRevLett.88.155503
PACS:
61.50.Ks, 62.50.+p
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