Electronic Resource
Copenhagen
:
International Union of Crystallography (IUCr)
Applied crystallography online
12 (1979), S. 421-422
ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
Trilling crystals of PbGe[Ge3O9](h) were grown from the melt by spontaneous crystallization. The crystals develop pseudo-trigonal-prismatic habit. The unit cell is monoclinic but pseudo-rhombohedral. The probable space groups are C2/m, C2 or Cm. The lattice constants of the reduced monoclinic unit cell are a = 7.331 (7), b = 11.455 (3), c = 6.831 (6) Å, β = 141.97 (13)°. Dx = 6.029 Mg m-3 for Z = 2 formula units. The lattice constants of the pseudo-rhombohedral setting are a1 = a2 = 6.800 (6), a3 = 6.831 (6) Å, = β = 115.13 (19), γ = 114.76 (18)° and Z = 1. X-ray powder data are given. Improved crystal data of PbGe[Ge3O9](t) are also given.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889879012887
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