About Ken Stauver

This author Ken Stauver has created 17 entries.

Filter membrane sample holders for Rotation/Phi stages

The Siemens D5000 and Bruker D8 systems we work with have an optional phi-stage that is very useful. It looks and moves like any other rotation stage, but it’s driven by a stepper motor which actually makes it an additional degree of freedom. The user can rotate the sample at a specified rate, position it at a specified angle, or even perform a scan in the phi axis. We have a client who just took delivery of their D5000 and

New orbital crusher

Much of the material we receive is already finely ground and ready for XRD or XRF analysis, but sometimes we receive bulk material which must be homogenized before we can take a representative split for analysis. This is one of the most frustrating parts of working with samples and very time-consuming as we’ve historically done it by hand. This usually means splitting out a large fraction of the material and breaking up larger rocks, etc by hand, sieving, then breaking

Rigaku D-Max zero background sample holders

This project started with a phone call several months ago from a Canadian government lab. They had a very specific application so the design was driven much more by their requirements than most zero-background holder designs. A 1mm deep well with a zero-background plate at the bottom was a key specification. We tried several options for creating this, but settled on a two-part design with a solid “floor” plate and a ring above it. As it turns out, cutting a

Introducing the KSA “My First” XRD system

Your little scientist will love the realistic lights and sounds of their very own X-ray diffraction system. At KSA we are firm believers that kids learn best by “doing”. There’s no better way to bring the next generation of bright thinkers into the lab. Now they can analyze real materials just like Mom and Dad! Everything you need to get started Basic PPE Dosimetry service Sample preparation kit MDI Jade “Tween” edition Now with REAL ionizing x-rays! Coming soon: BATF arson investigation kit with accelerant detection!

Bruker D4 Endeavor on its way out

The D4 Endeavor fits in a unique niche in the XRD world. It’s basically the same thing as a Bruker D8, but built into a very compact cabinet with a large autosampler on top. These machines see heavy use in the cement, pharmaceuticals, and aluminum industries among others. Today we have one headed out to a new home. It started life in the pharmaceutical world, but had light use so it was a great candidate for refurbishment.

Hybrid sample holders for Bruker FlipStick Autosamplers

There’s a simple and inverse relationship between the average atomic number of a given matrix and the efficiency with which it scatters X-rays. The effect isn’t all that much different from shining a flashlight on a white piece of paper. While it’s nothing like a mirror, you’ll definitely get light scattering off of it to some degree. This effect has strong effects on most XRD and XRF applications in that the additional photons must be dealt with somehow. This post

NIST 1976c custom mount

It’s easy to forget how much of our scientific work hinges upon comparative data. The entire field of metrology is concerned with the verification and maintenance of “standard reference materials” (SRMs). Creating a perfect reference standard essentially involves proving a negative. In the XRD world, we need to prove that there are no impurities, no crystalline defects, no unaccounted for thermal variations, no stress/strain effects present, and above all, that the first unit produced is effectively identical to the last

XRD tube bisection

XRD tubes rely on the ability to precisely regulate the flow of electrons from the filament to the anode in order to create x-ray emissions. That requires a completely evacuated envelope to avoid having the high-voltage short to ground. The resulting symptom is that the high voltage generator will shut down almost instantly when the high-voltage potential is applied. This particular tube looked fine on the outside and didn’t even look all that old so it was a little surprising to

Mystery crystals

Curiosity may have killed the cat, but it’s the lifeblood of a well-functioning analytical lab. A few days ago, Todd was preparing a water chiller for shipping and washed out some corrosion products with acetic acid. The resulting solution was left in a beaker over the weekend and when we returned, he noticed that it had formed rather large crystals. So he did what any curious person with a lab full of XRD instrumentation would do. He ground it up

PMMA vs Aluminum sample holders

Plastic sample holders have been the default option XRD for decades. They’re inexpensive to make, good enough for most purposes, and very resistant to a wide range of chemicals. Seems like a “win” all around right? As long as they’re made correctly and from the proper materials, these work just fine. Spoiler alert: 3D printed thermoplastics have a distinct structure so if you try making your own, be sure they’re well out of the irradiated area. Comparison of the same powder