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Physical & Chemical properties

Additional physico-chemical information

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Administrative data

Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable, well-documented study report which meets basic scientific principles

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Analysis was performed by using x‐ray photoelectron spectroscopy (XPS) with a monochromatic Al x‐ray source (150 W) on areas approximately sized 700 x 300 μm. Wide spectra were run to detect elements present in the outermost surface oxide (information depth of a few nanometer) at five different surface area locations. Detailed high resolution spectra (20 eV pass energy) were acquired for the main compositional elements of each test item.
GLP compliance:
yes
Endpoint investigated:
other: surface composition

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Test material identity in study report: ferrosilicocalcium alloy (CaSi) (EINECS n° 234-587-1, CAS n° 12013-55-7; EINECS n° 234-588-7, CAS n° 12013-56-8; EINECS n° --- --- -, CAS n° 12737-18-7). Test material identity given here (EINECS n° 915-037-6) includes these materials.
- Composition of test material, percentage of components: Si 61% (w/w), Ca 30% (w/w)

Results and discussion

Results:
The surface of CaSi is composed of silicon, calcium, iron and aluminium rich oxide phases. The thicness of the surface oxide layer is only few nanometers.

Applicant's summary and conclusion

Conclusions:
A thin nanometer thick surface oxide layer composed of silicon, calcium, iron and aluminium rich oxide phases is present on the surface of CaSi.
Executive summary:

Surface composition analysis of CaSi was performed by using x‐ray photoelectron spectroscopy (XPS). The surface of CaSi is composed of silicon, calcium, iron and aluminium rich oxide phases. The thickness of the surface oxide layer is only few nanometres.