Die Kristallstruktur und die Verzwillingung von RbAlSiO4
- 1 February 1975
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Kristallographie - Crystalline Materials
- Vol. 142 (3-4) , 225-238
- https://doi.org/10.1524/zkri.1975.142.3-4.225
Abstract
Crystals of the compound RbAlSiO4 were synthesized hydrothermally. The space group is Pc21 n with the lattice dimensions a = 9.226, b = 5.337 Å, c = 8.741 Å and Z = 4. All crystals are triple twins with twinning-planes (110) and (130). A structural interpretation is given. The crystal structure of the pseudohexagonal RbAlSiO4 has been determined and refined by the least-squares method to an R index of 2.6% considering extinction and using 370 three-dimensional diffractometer data. RbAlSiO4 is composed of an ordered Si, Al framework with channels of six-membered rings in direction of the c axis. These cavities contain the Rb cations. The crystal structure is derived from the type of tetrahedral framework with the symmetry Icmm. The mean values of the cation-oxygen distances are Si–O = 1.618 Å and Al–O = 1.738 Å.Keywords
This publication has 5 references indexed in Scilit:
- NH4LiSO4. A variant of the general tridymite structureActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1969
- A new tetrahedral framework structure in sulfates and fluoberyllatesThe Science of Nature, 1969
- Electronic and mechanical sources of error in diffractometryActa Crystallographica Section A, 1969
- A general theory of X-ray diffraction in crystalsActa Crystallographica, 1967
- The crystal structure of kalsilite, KAlSiO4Mineralogical Magazine and Journal of the Mineralogical Society, 1965