The starting point for any kind of data analysis in APT is knowing where objects like a phase or a thin layer etc. are. Most commonly this is done by analysis of the dataset cut into small cubes aka voxels. These voxels are then either directly visualised using volume rendering or via iso-surfaces. Iso-surfaces are much like height lines in a map; they connect points...

Posted on Dec 11 2014 - 12:27am by admin
#0

Unfortunately my download management software has stopped working and broke all links (sigh). Stay tuned, I’ve changed my download management software and will fix the links asap (asac). ...

One of the most common tasks in atom probe analysis is the calculation of a proximity histogram (see this paper from Hellman et al.). This is actually a very simple task, only involving calculating the distance between each atom and the interface and turning this into a concentration histogram. This is commonly done from is0-surfaces, but in principle it can be done...

In order to create analysis objects (stay tuned for the tutorials) we need to know where the boundary of the dataset is. This is to make sure that our analysis objects end exactly where the boundary is. In order to do that we can use either convex hulls or alpha hulls. Convex hulls can only delineate a boundary of a fully convex dataset, say if you have clipped a...

AtomBlend is a Blender plugin we have developed here in Sydney over the last few months by Vavara Efremova under the supervision of Anna Ceguerra, Simon Ringer and myself, Peter Felfer. Blender is a very powerful 3D visualisation and animation package and is widely used in professional computer graphics. The best thing about it: it’s free and open source, so...

Here’s a download link for the talk I gave on atom probe tomography of nanoparticles. I hope it will inspire other people to get into the lab and have a go at the problem. I am still very much learning how to do that too, so I hope to learn from all of you out there. Also: here are the links to the papers on the nanoparticles that are already published (JACS...

This is the talk I gave on interfacial excess mapping at the APT&M conference 2014. IE mapping is used to analyse the distribution of chemical elements, isotopes or ions at an interface created using either DCOM or iso-surfaces. There will be a paper in the proceedings ad I’ll make the programs available too…. stay tuned. ...

A lot of people in the atom probe community seem to treat the atom probe reconstruction as if it was a great mystery, while in fact it’s a very simple algorithm. That’s why I want to give you a quick run down on what it’s all about. So, don’t be afraid. It’s only atom probe reconstruction… Here’s the code of the reconstruction: [wpdm_file id=10] license: CC0 (do whatever you want with it!) And the video tutorial: ...

Posted on May 13 2014 - 11:34pm by admin
#0

The first video about sample preparation for atom probe using plan lift out (PLO) I posted over a year ago has seen quite a few views, so I thought i’d post another one about cross sectional lift outs (XLO). This one is rather short, because it’s purpose is only to show the workflow and the geometries involved. This technique is especially useful for thin...

Posted on Mar 28 2014 - 3:09am by admin
#2

We finally got the new sample holders for the atom probe. They allow us to do a variety of things, most of all they fit into a lot of different machines (atom probe, TEM, FIB, SEM…) and they have a three digit code on them that allows us to uniquely identify each individual sample within the lab. The new series of Holders is also designed for wire shaped samples...