ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
By the use of the X-ray Pendellösung fringes in α quartz including a single Dauphiné twin, the ratios of the structure factors having the forms of hk, l and hk, \bar l were determined with an accuracy of about a few tenths of one per cent. In the most favourable case, namely, the case of |F10,1|/|F_{10,{\bar 1}}|, the agreement between independent measurements for the same specimen was better than 0.1%. The values of the ratios for the extinction-corrected structure factors |Fcorr| and the structure factors |Fcal| calculated from the proposed structure in recent investigations (Young & Post, Acta Cryst. (1962), 15, 337; Zachariasen & Plettinger, Acta Cryst. (1965), 18, 710) are in accordance with the present ones within the mean deviation of about a few per cent, whereas the ratios for the observed values |Fobs| differ from ours more than ten percent. Some critical remarks on the Pendellösung method of determining structure factors, particularly by means of traverse-type topographs, are put forward.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739468000318
Permalink