Pellet of Murchison powder (n°2) | DAYSY

Sample

Name: Pellet of Murchison powder (n°2)

Owner of sample

Database

DAYSY

Experimentalists

Rosario Brunetto

Origin of sample

Date: 2013-01-01
Provider: IAS, Orsay

Image

Left: mosaic of optical microscope (10x objective) images obtained on Murchison pellet n°2, with irradiation on four spots performed over diameters of 4 mm; a central area (2 mm in diameter) remained non-irradiated. Right: optical image (10x objective), showing the typical surface roughness and porosity, along with compositional heterogeneity reflected by different contrasts.

Physical characteristics

Thickness: 200.0 $\pm$ 100.0 ${\mu}m$
Diameter: 13000.0 ${\mu}m$
Mass: 0.1 $\pm$ 0.02 $g$
Substrate material: KBr
Substrate comments: KBr window, 2 mm thick, 13 mm diameter. The KBr is used as a substrate to avoid meteorite pellet break.
Comments: Pellet prepared by pressing (7 tons for 10 min) about 100 mg of the original dust (grain size 1–100 µm) on top of a KBr substrate pellet. The KBr is used as a substrate to avoid pellet break. Thickness of the meteorite pellet is large enough (>200 µm) to avoid contribution of KBr to the spectra.
Central non irradiated (virgin) area

Sample environment: Temperature

Temperature: 300.0 $\pm$ 5.0 $K$
Temperature max: 300.0 $\pm$ 5.0 $K$

Sample environment: Fluid

Type: ambient air
Fluid pressure: 1.0 $bar$

Documentation and publication

Publications

Lantz et al., 2015, Astron. Astrophys., 577, A41

Layers in sample

Number

Layers

Pellet of Murchison powder , 200.0 ${\mu}m$

Sample processings

Title

Murchison pellet preparation

Precursors

Matters

Produced sample

Sample

Pellet of Murchison powder (n°2) (this sample)

Processing steps

Step	Chronology	Date	Type	Process	Changes
#1	before layer formation	2013-01-01	mechanical	pressing granular KBr to form the pellet substrate
#2	during layer formation	2013-01-01	mechanical	pressing Murchison powder on top of the KBr substrate (7 tons for 10 min)