XRD Glass Sample Recess: Planning a Cover over a Powder Sample

The important relationship is between the prepared sample surface, the holder and any covering layer. A recess dimension alone does not establish the surface position in the instrument or a verified air-isolation result.

In this guide: Configuration · Design comparison · Locate the sample surface from the instrument holder · Treat the cover as part of the measurement request · Changing the recess starts with the sample task · Define what air isolation must mean for the method · Enquiry

The configuration discussed here

What changes from the simpler form?

A recess in a glass slide defines a sample-loading region within a larger holder interface. Adding a cover creates another layer in the measurement arrangement, whose inclusion and background contribution need separate review.

Locate the sample surface from the instrument holder

A shallow recess helps define where powder is placed, but the filled surface needs a reference in the actual holder. Give the seating surface, the required sample level and the area to be illuminated. Do not use the recess bottom as the instrument datum unless that relationship is defined.

Yale's XRD preparation guidance identifies a flat sample surface and suitable particle orientation as preparation concerns. That general guidance is not a measurement or qualification of this slide; the laboratory method still determines its loading requirements.

Yale Materials Characterization Core: XRD sample preparation

Treat the cover as part of the measurement request

If restricting sample exposure is important, identify the proposed covering material, its position and how it is retained. Ask for the cover's effect on the actual measurement to be assessed using the relevant blank or background procedure.

Covering strips are separate from the selected slide unless the quotation includes them. List the slide and covering components separately in the enquiry and confirm the delivered set.

Changing the recess starts with the sample task

For example, a customer may need to retain an existing slide footprint while changing the recess to suit a limited amount of powder. Give the instrument's sample-position reference, required illuminated area and loading method, not just a new cavity volume.

MQ can review the proposed recess and cover arrangement. The resulting geometry is not automatically suitable for another diffractometer simply because it fits a similar rectangular holder.

Define what air isolation must mean for the method

A cover is not proof of a specified seal. If the sample has an atmosphere requirement, state the permissible exposure, preparation sequence and verification needed. Those conditions need review before a closure claim can be made.

Likewise, agree the critical slide and recess dimensions, material requirements and any inspection record. The reference is a design and loading discussion, not a completed diffraction result or certified sealed sample environment.

Structure reference and specification points

Download the structure reference (PDF)

Are the covering strips shown in the family image included with this recess option?

They are separate accessories unless the ordered set explicitly includes them. Confirm the slide, covering material and any retaining parts as individual items, with their measurement and closure requirements.