Event (355)

Do you want to collect high-quality X-ray reflectometry data? Good practices that will help
Do you want to collect high-quality X-ray reflectometry data? Good practices that will help

19 October 2016  X-ray reflectometry (XRR) is a well-established analytical method for the characterization of thin layered structures, surfaces and interfaces. It is used to determine layer thicknesses and densities and provides roughness-related information. The basics of XRR and the analysis of XRR data were discussed in one of our webinars last year. This time, the focus will be on a typical workflow, from setting up the X-ray optics of a diffractometer, the essential steps of the sample alignment procedures to the final XRR measurement. Don’t miss the useful practices and tips that we will share with you in this webinar. They will help you to collect high-quality XRR data from your layered samples.

Beyond Cu: The many colors of X-rays - selecting the best X-ray tube for your analysis
Beyond Cu: The many colors of X-rays - selecting the best X-ray tube for your analysis

14 December 2017  Modern laboratory diffractometers are designed to operate with X-ray tubes that may have many different types of anodes: Cr, Mn, Fe, Co, Cu, Mo, Ag, and more. The X-ray tube anode determines the wavelength of radiation that is produced for measurements. Despite the wide selection of anodes available, contemporary literature is dominated by research that uses Cu wavelength X-rays for powder diffraction and scattering studies—so much so that some researchers mistakenly believe it is the only choice because "everybody else uses it". While Cu anode X-ray tubes have always been widely used in laboratory diffractometers, literature provides many examples of measurements that benefited from the use of other wavelengths of radiation, including synchrotrons and neutron beamlines. Selection of the X-ray anode can determine if the X-ray beam penetrates 4 microns or 100 microns into the sample, greatly influencing the irradiated volume and grain statistics that are important for quantitative phase analysis and texture analysis. Selection of the X-ray anode can optimize peak intensity and background noise. Selection of the X-ray anode can enhance sensitivity to certain dopants in an alloy or impurities in a mixture. Selection of the X-ray anode can determine the precision of large d-spac