EXAFS measurements on s209

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Presentation transcript:

EXAFS measurements on s209 Compositions where measurements were taken (8 total measurements): Co 100% Co 80% Co 50% Co 20% Mn 20% Mn 50% Mn 80% Mn 100% Approximate Relative Doping Levels Arrows designate sample position where data was taken. Arrow color represents the energy region data was taken (blue=Mn Edge, red=Co Edge).

XANES Standard Measurements Compare these with EXAFS data to understand oxidation state of dopants. Probably should have done Co oxides too. Various Mn States Co metal film measured Differences in Mn metal films measured

Co 100% Co EXAFS with Bragg reflection removed by hand Mu(E) raw data and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Co 80% Co EXAFS with Bragg reflection removed by hand Mu(E) raw data and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Co 50% Co EXAFS with Bragg reflection removed by hand Mu(E) raw data and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Co 20% Co EXAFS with Bragg reflection removed by hand Mu(E) raw data and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Co Comparison Raw data Normalized Chi(k) Chi(q)

Co Comparison: Chi(R)

Mn 100% Raw EXAFS data close up Mu(E) and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Mn 80% Raw EXAFS data close up Mu(E) and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Mn 50% Raw EXAFS data close up Mu(E) and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Mn 20% Raw EXAFS data close up Mu(E) and background fit. Chi(k), reverse transform Chi(q), and forward transform window Chi(R) and reverse transform window

Mn Comparison Raw data Normalized Chi(k) Chi(q)

Mn Comparison: Chi(R)

Current theory on dopant behavior Co prefers substitutional site in Ge lattice Large amounts of Co doping MAY cause interstitials Mn, by itself, forms cubic Mn precipitates Mn, with even trace amounts of Co, shows reduced diffusion and precipitation Indirect evidence suggests Co & Mn form dimers Co on a substitutional site and Mn on a neighboring interstitial site Mn soluble in Ge prefers substitutional site Energy barrier to interstitial site not as high as for Co