Automation of a Filmscanner for Evaluation of Guinier Films and Applications to Determination of Diffraction Data of Pb2Sr2Ho0.625Ca0.375Cu3O8 and Measurement of Thermal Expansion of GeO2

Abstract

AbstractA previously manually operated film comparator used to evaluate Guinier films has been automated as a film scanner of the flat film type. The film movement is controlled by a stepper motor and the intensity of the transmitted light is recorded as a function of position on the film. A personal computer controls the stepper motor and records the measurements of the transmitted light intensity. The data quality is judged from refinements of lattice constants for α-SiO2 and ZrO2. The powder pattern for Pb2Sr2Ho0.625Ca0.375Cu3O8 and a high temperature study of the thermal expansion of GeO2 are presented.