MAUD basic information

From the Maud website (http://maud.radiographema.com/): MAUD = Materials Analysis Using Diffraction - A Rietveld extended program to perform the combined analysis. It can be used to fit diffraction, fluorescence and reflectivity data using X-ray, neutron, TOF or electrons.

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MortenBNielsen
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MAUD basic information

Post by MortenBNielsen » 30 Oct 2015, 13:32

This thread is meant as a repository for useful links related to MAUD. This can be anything from the program website itself to tutorials, papers describing models that are implemented in the program or other stuff. I plan on curating this thread and updating the main post as often as needed, so consider it a work in progress for now.

Downloading MAUD
MAUD is freely available for download at the program website.

Installation
Newer models of MAUD should be fairly straight forward to install. Be sure to read the instructions available in the download section of the MAUD website though.

Information for beginners
Video intros
If you have never used MAUD before, now is a pretty good time to take out a few hours of your day to take a look at the series of tutorial videos that have been made by the author of the program, Luca Lutterotti. These YouTube videos are split into a number of categories: Going through the first two videos is strongly recommended before you try to model any data. The best way to become proficient at the first stages of using MAUD is to have the program open alongside the video and do the same thing in the program as is being described.

Written intros
Two tutorial papers on MAUD, published in Powder Diffraction, can also serve as good starting points to understanding how the program works, especially if one follows the detailed guidelines provided in their appendices. You should be able to download the two papers by using the links below: Commonly encountered problems
These are collected in a separate thread, linked to here. When Q&A's (hopefully) begin to appear in this subforum they will also be linked to from here. Problems described and solved in the thread include:
  • Cholesky negative diagonal
  • MAUD claiming convergence too early

Model links
There are quite a lot of different models in MAUD that can be selected. Below follows lists of the original papers that the various models are based on.
Size/strain (peak broadening) models:
Isotropic (Delft) model

Specialised modelling
One very strong feature (some would argue its raison d'être) of MAUD is its ability to "slice" 2D powder diffraction datasets in order to model texture (also known as preferred orientation) and/or lattice strain (macro strain). Doing so not only requires quite good data, but also a fairly good understanding of what one is doing.

Modelling of texture
I know very little about this (rather complex) topic and will thus defer much description here until an expert can contribute. That said, a texture tutorial can be found here.

Modelling of macrostrain at high pressure
Finding easily understood literature/guidance in this area can be very difficult, but one very good source of information is the website of Sebastién Merkel of Université Lille. Being a geologist he clearly knows his strain theory and is the one who wrote the "Radial diffraction in the DAC" model in MAUD. To begin modelling data in this fashion one should take a look at his overview page of content for modelling of diamond anvil cell data.

It should be mentioned that the website of Merkel and the tutorial papers all exclusively deal with radial diffraction. This is not a very common way to do diamond anvil cell experiments in the chemistry/physics community who prefer to carry out measurements on-axis (in transmission through the diamonds). I will create a thread to explain how to model this type of data.
Last edited by MortenBNielsen on 18 Nov 2015, 09:18, edited 1 time in total.

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MortenBNielsen
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Re: MAUD basic information

Post by MortenBNielsen » 30 Oct 2015, 13:51

If this post could be pinned in the subforum that'd be awesome :D

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