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CALCOMP
( a ) IBM7090 computation time (min) and ( b ) Calcomp pen plotter time (mi...
Wide-Line Profiling
Abstract Many researchers still generate X-ray powder diffraction (XRD) data using strip chart recorders. Either templates or conversion tables are then used to convert these patterns from O 2θ to interplanar spacings, i.e., d-values, thereby allowing the Joint Committee on Powder Diffraction Standards (JCPDS) XRD diffraction files to be used to determine which phases are present. The merits of templates over conversion tables are the time and labor they save. Although computerized X-ray diffraction systems that automatically convert O 2θ to d-values are now commercially available, the cost of these systems ($25,000-$150,000) prevents many researchers from using them. A computer program has therefore been written to produce plotter-generated templates to convert O 2θ to interplanar spacings (Figure 1). This program prompts the user for all necessary information and contains options to select the radiation wavelength, English or metric scales, various combinations of strip chart and goniometer speeds, and 29 range. The program utilizes the Bragg equation and was written in the C programming language. It operates under Unix system 5 or MS-DOS version 2.x. Although the program was written to operate with the CALCOMP 970 and 936 plotters, the plotting routines were written into the program in a modular fashion, thereby allowing the user to substitute routines for other X-Y plotters. This feature makes the program more versatile and, therefore, functional for a large number of users. The location of these routines within the software is given in the program documentation. Scales for O 2θ and d-values on the conversion template are labeled to allow