STUDY OF THE AMORPHISATION PROCESS IN DIAMOND BY MEANS OF THE MÖSSBAUER EFFECT

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Submitted on 1 Jan 1980

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STUDY OF THE AMORPHISATION PROCESS IN DIAMOND BY MEANS OF THE MÖSSBAUER

EFFECT

M. van Rossum, G. Langouche, J. de Bruyn, M. de Potter, R. Coussement

To cite this version:

M. van Rossum, G. Langouche, J. de Bruyn, M. de Potter, R. Coussement. STUDY OF THE AMOR-

PHISATION PROCESS IN DIAMOND BY MEANS OF THE MÖSSBAUER EFFECT. Journal de

Physique Colloques, 1980, 41 (C1), pp.C1-447-C1-447. �10.1051/jphyscol:19801174�. �jpa-00219662�

JOURNAL DE PHYSIQUE Colloque Cl

,

supplkment au n O 1, Tome 41, janvier 1980, page C1-447

M. Van Rossum, G. Langouche, J. De bruyn, M. de Potter and R. Coussement I n s t i t u u t voor Kern- en StraZingsfysika, B-3030 Heverzee, BeZgiwn.

It is well known from earlier measurements that, when heavy ions are implanted into diamond at low energy, an amorphous layer builds up at the

13 2 surface when the ion dose is raised above 10 at/cm.

We report here the first observation of this pheno- menon by Msssbauer Spectroscopy.

1 3 3 ~ e has been implanted into natural diamond sto- nes (type I A and I1 B) with doses varying between 5. 1012 and 1.5 1014 at/cm 2

.

The Msssbauer spectra show a strong dependence on the ion dose; this be- haviour is attributed to one of the spectral lines (-0.20 f 0.05 mm/s) arising from Xe atoms in an a- morphous surrounding. This line is suppressed when the diamonds are kept at 600'~ during implantation, or when the implantation is followed by thermal an- nealing above 1000°~. The same line appears when the diamond is amorphized after low dose Xe implan- tation, by irradiation with 80 keV He ions up to

17 2 5.10 at/cm

.

Apart from the amorphous line, several other components are also present in the spectra. One of them is quadrupole split, pointing towards a vacan- cy associated site. The other ones are situated at high negative velocities, indicating very high s-electron densities. A line at -2.73 f 0.07 mm/s is only present after heat treatment. These high s-densities might arise from a volume compression effect, which will distort the 5s wave functions and/or delocalize the 5p orbitals.

Figure 1 : 3 3 3 ~ s Mtissbauer Spectra

* ~ n extended paper will be published in _Ph&cs Letters A

.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801174