| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1794995 | Journal of Crystal Growth | 2008 | 7 Pages |
Abstract
The principal refractive indices of brushite (CaHPO4·2H2O) crystals for sodium light, 589 nm, have been determined by a combination of several methods: microscopic interferometry, retardation measurements with an Ehringhaus 6λ compensator, and determination of the angle 2V between optic axes from the measurements of extinction directions using a spindle stage and evaluating the data with the computer program EXCALIBRW. The following values were found: nα=1.54089, nβ=1.54620, nγ=1.55191, and 2V=88.2°. The standard deviations of the three indices lie in the range 7–8×10−5. The results are regarded valuable in connection with studies of crystal growth kinetics in biological mineralization and related fields.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Hans E. Lundager Madsen,