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A variety of specific tasks make up these guidelines. Single phase jobs were developed to provide familiarity with the strategy and users are encouraged to carry out at least one of these single phase tasks. More complicated jobs including clinker and cement use the KOH-sugar (KOH-S) extraction residue and the salicylic acid-methanol (SAM) extraction residues to improve specifications prior to refining the bulk product.

It is possible to do refinements on a single pattern of clinker or cement, but the results are not most likely to be satisfactory. If you are preparing to utilize the method regularly on samples of a product such as portland cement, which includes a complex set of stages with the same crystal structure specifications, it is a good strategy to utilize patterns for KOH-S, SAM, and maybe nitric acid extraction residues to refine the crystal structure specifications more precisely for phases in each residue and then to utilize the resulting criteria in your subsequent analyses.

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And in a subsequent section on evaluation expected outcomes are described. Peak profile parameters are needed for fitting. These criteria explain the instrument contribution to the diffraction peak shape. includes a file that can be used as an example in developing a file particular to your instrument. For fitting an XRD pattern, the peak profile specifications ought to be established utilizing information collected utilizing the exact same instrument that was used to gather the pattern.

Nevertheless, the peaks from this sample are much sharper than seen with portland cement phases, so more steps are required to fine-tune the peak shape parameters. An alternative is to use a single phase product with a peak shape more like that of the cement stages. This might be among the NIST SRM powder diffraction intensity requirements or a fine-grained quartz powder.

Results might be affected by the refinement series and a poor series may cause the program to crash. The series given here is based in part on Table 1.5 of Young, in part on Cranswick and Swainson, and in part on the individual experience of the authors. Carry out the following jobs.

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If you have any difficulty, you may wish to check the section entitled Helpful Hints. Download the Rietveld software application and its graphical user interface plus associated files from . Versions are readily available for various types of personal computers, and you should use the most recent variation for your particular computer system.

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If you want such a link, you need to set it up yourself. Download and conserve the file which contains the following 5 information sets: Cement crystal structures in several information formats: Individual GSAS experiment files (. EXP), a standardized crystallographic information file (. CIF) that is legible by a lot of Rietveld codes, and a table (. TBL) format, which is the easiest to read for manual data input.

These information should be thought about read-only to maintain the initial values. A key is offered within the information folder to explain the data files. An instrument parameter file (. PRM) and several of the single phase patterns offered (corundum, periclase, lime, or quartz). Utilizing these files and the crystal structure specifications from the structure archive (TBL folder) for the stage you selected, improve the single phase pattern to create a brand-new peak profile parameters file.

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The single phase patterns and the subsequent XRD patterns were collected utilizing the exact same instrument (at NIST) and so appropriate for these tasks, though not for use in refinement of patterns gathered using your own instrument. Next, deal with the XRD patterns for one of the complex mixtures (SRM 2686 clinker, efficiency cement A, or efficiency cement B).

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Utilize the crystal structure specifications for all the recognized phases from the structure archive and your instrument parameters file to improve the mix to determine the amount of each phase. Compare results to released worths (see section entitled Assessment). Work with the XRD patterns for the extraction residues of the exact same complex mixtures, both SAM (SRM 2686 clinker, efficiency cement A, or efficiency cement B) and KOH-S (SRM 2686 clinker, efficiency cement A, or efficiency cement B).

Using the crystal structure parameters for all the determined phases from the structure archive and your instrument parameters file, fine-tune the extraction residues of the exact same complex mixture to identify improvements for the crystal structure parameters. Utilize these brand-new parameters to fine-tune the mixture to determine the quantity of each phase.

Compare results to published worths (see section titled Evaluation). Compare outcomes of the complex mixes and selective extraction residues (the calculated mass fraction of each phase and the figure of merit for the clinker/cement without using extraction residues and with utilizing extraction residues).