Frequently asked questions

The two techniques are highly complementary materials analysis techniques, which when used together can can greatly improve accuracy of phase identification and quantification. X-Ray Fluorescence (XRF) is used to identify and quantify (% or parts per million) elements, generally Fluorine (Z=9) to Uranium (Z=92), in a sample. X-ray Diffraction (XRD) is the most accurate and direct method for identifying crystalline compounds (quartz- SiO2 , calcite- CaCO3, micas- KAl2(Si3Al)O10(OH,F)2, etc) and their concentration (%).

No. However to obtain accurate and representative results, both techniques generally require a powdered sample (pulverised to approx. 50 microns or less).

Just about any type of solid material can be tested. Materials from naturally occuring sources i.e. soil, rock, clay, coal, etc through to industrial products such as residues, scale, cement, ceramic process materials etc. Just about anything you’re interested in.

XRD Approximately 1 gram is usually sufficient to identify and quantify crystalline minerals. When there is a limited amount of sample available we can generally mount milligram sized samples on a low background holder. For clay analysis we generally ask for about 20-60 grams of sample depending on the clay percentage. XRF Major element analysis: approximately 0.4 to 5 grams of powdered sample Trace element and semi-quantitative analyses: approximately 2 to 5 grams Loss on Ignigtion (LOI): approximately 5 grams Particle Sizing 1 to 20 grams depending on amount of particles and particle size. Petrography Standard thin sections have dimensions of 75 x 26 mm. A sample larger than this would be ideal (generally fist sized). SEM Sample size should be kept to a minimum. Chip sized samples 15mm and less are ideal. Material needs to be able to withstand the vaccum inside the SEM. Samples may be mounted in resin to strengthen.Samples are also coated in an electrically conductive medium to prevent negatively charged electrons from building up on the sample during analysis.

Yes, for the small amount of samples we have zero background sample holders which can take samples from miligram size.

Prior to sending samples: - Alert Sietronics Lab Services via email or phone that samples will be arriving - Ensure a Purchase Order or Test Request form (undefined)is enclosed detailing sample numbers and testing requirements. - Ensure samples are labelled and appropriately sealed and packaged. Samples can be sent to: Attn: Lab Manager Sietronics Pty Ltd 40 Hoskins Street Mitchell ACT 2911 Australia P: +61 2 6246 9299

XRD: Generally 1-2 weeks from receipt of samples. 24-48 hour turn-around may be available upon request at additional cost. XRF: Generally 2-3 weeks from receipt of sample Particle Sizing: Generally 1-2 weeks Petrology: Generally 4-6 weeks SEM: Turn around time on application.

Yes! We can accept samples from almost all countries without any issues, however to be sure please contact us before sending samples so we can advise how they should be packed, and what information needs to be included. Due to recent changes by the department of agriculture, some samples require gamma irradiation upon entry to Australia. Please contact us to discuss further.

Most of the time. XRD can usually identify most of the phases/minerals that are present in the sample, however there are cases identifying some or all of the phases is not possible. Particularly for samples with high amorphous content, or phases with overlaping peaks, identification can be difficult. In these cases, additional methods such as XRF, SEM or FTIR can often aid in the identification.

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We follow the USGS guidelines for clay mineral identification. This includes glycolation, heat treatment to 400c and 550c. If necessary we can differentiate kaolinite and chlorite and kaolinite and halloysite minerals.