Optical rotation in RbTiOAsO4 (point group mm2)
نویسندگان
چکیده
Measurement of optical rotation in RbTiOAsO4 (RTA) with the tilter method resulted in an optical rotation of r12 1⁄4 þ17ð3Þ /mm at a wavelength of 670 nm, when a (100) sample was tilted about [001]. A tilt about [010] showed no rotation, as expected from the directional dependence of optical rotation calculated from the tensor in point group mm2. The absolute Miller-indices of the samples were found using X-ray anomalous scattering. The calculations with a dipole-dipole model show that the As5þ-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 Ti4þ – ions as a result of the distorted octahedral co-ordination with oxygen.
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