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Werner Kaminsky, Pamela A. Thomas, A. Michael Glazer

Optical rotation in RbTiOAsO₄ (point group mm2)

Measurement of optical rotation in RbTiOAsO₄ (RTA) with the tilter method resulted in an optical rotation of ρ₁₂= +17(3)^o/mm at a wavelength of 670nm, when a (100) sample was tilted about [001]. A tilt about [010] showed no rotation, as expected from the directional de-pendence of optical rotation calculated from the tensor in point group mm2. The absolute Miller-indices of the sam-ples were found using X-ray anomalous scattering. The calculations with a dipole-dipole model show that the As⁵⁺-ions in RTA correlate with the main structural contribution of the optical rotation. However, there seems to be an even larger intrinsic contribution due to the Ti⁴⁺ – ions as a result of the distorted octahedral co-ordination with oxygen.

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 217, 01/2002
Pages: 001

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