caa a22 4500 386400970 CHVBK 20180307112158.0 cr unu---uuuuu 161130e198909 xx s 000 0 eng 10.1017/S0885715600016638 doi S0885715600016638 pii (NATIONALLICENCE)cambridge-10.1017/S0885715600016638 X-Ray Diffraction Data for SnO2. An Illustration of the New Powder Data Evaluation Methods [Elektronische Daten] The Powder Diffraction File (PDF) X-ray diffraction pattern for SnO2 (cassiterite, syn), determined in the early 1950's at the National Bureau of Standards, was evaluated using the NBS*AIDS83 editorial review program and a calculated powder pattern. Systematic errors in d-spacings and relative intensities were attributed to the lack of an iterative least-squares refinement of unit cell parameters, to inadequate precision in reporting d-spacings, to poor sensitivity to high angle reflections, and to detector dead time. A new SnO2 pattern was prepared and used to illustrate criteria for evaluation of powder patterns. An R-Factor for quantifying agreement between observed and calculated relative intensities was utilized. The systematic errors in the earlier pattern occurred at higher angles and did not hinder its usefulness for identification purposes. Copyright © Cambridge University Press 1989 McCarthy Gregory J. Departments of Chemistry and Geology, North Dakota State University, Fargo, ND 58105, U.S.A. Welton Jean M. Departments of Chemistry and Geology, North Dakota State University, Fargo, ND 58105, U.S.A. Powder Diffraction Cambridge University Press 4/3(1989-09), 156-159 0885-7156 4:3<156 1989 4 PDJ https://doi.org/10.1017/S0885715600016638 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0885715600016638 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McCarthy Gregory J. Departments of Chemistry and Geology, North Dakota State University, Fargo, ND 58105, U.S.A NATIONALLICENCE 700 1- Welton Jean M. Departments of Chemistry and Geology, North Dakota State University, Fargo, ND 58105, U.S.A NATIONALLICENCE 773 0- Powder Diffraction Cambridge University Press 4/3(1989-09), 156-159 0885-7156 4:3<156 1989 4 PDJ CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge