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Mechanism of phosphorus diffusion gettering of cobalt in silicon studied by Mössbauer spectroscopy (1985)

Shaikh, A. G. ; Schröter, W. ; Bergholz, W.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 58 (1985), S. 2519-2523

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The gettering of cobalt in silicon during phosphorus diffusion under high surface concentrations (PDG) has been investigated by Mössbauer spectroscopy between 825 and 1000 °C. It has been found that cobalt, distributed uniformly in the specimen before PDG, is concentrated within a highly phosphorus doped Si-surface layer thinner than 0.5 μm after PDG. It is also shown that PDG suppresses surface gettering and that the residual cobalt concentration in the bulk can be lower than the cobalt solubility. Mössbauer spectra of this layer show that cobalt occurs as two species there. The first of these has nearly cubic symmetry and is transformed into the second species upon annealing at 600 °C. This species is stable under the conditions of PDG. Neither the formation of phosphorus-cobalt pairs nor the presence of CoSi2 can provide a comprehensive explanation of all experimental facts.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.335930

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Poly(arylenecarbonate)s oligomers by carbonate interchange reaction of dimethyl carbonate with bisphenol-A (1994)

Shaikh, A. G. ; Sivaram, S. ; Puglisi, C. ; [et al.]

Springer

Polymer bulletin 32 (1994), S. 427-432

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ISSN: 1436-2449

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Summary Fast atom bombardment mass spectrometry (FAB-MS) has been used to identify oligomers with different end groups obtained by the carbonate interchange reaction of bisphenol-A with dimethyl carbonate and the partial methanolysis of poly(bisphenol-A carbonate)s. Based on the FAB-MS data, a reaction pathway for the formation of compounds in the synthesized oligomers is proposed.