12233-73-7Relevant academic research and scientific papers
Positron-annihilation monitoring of reduction processes in conducting glasses
Pliszka, Damian,Kusz, Bogus?aw,Gazda, Maria,Trzebiatowski, Konrad,Karwasz, Grzegorz P.,Brusa, Roberto S.,Zecca, Antonio
, p. 257 - 263 (2004)
Depth-resolved, Doppler-broadening positron spectroscopy has been used to study structural properties of semiconducting glasses. Bismuth- and lead-doped, silica and germanium glasses with five different compositions were studied. Conducting surface layers in these glasses were obtained by reduction in hydrogen atmosphere. Depth scanning with a slow-positron beam allows to follow the temperature and time evolution of layers modified during reduction processes. However, while reduction processes in inner layers (below a few tens of nm) are clearly seen in changes of the Doppler-broadened positron- annihilation line, the near-to-surface changes are more complex and not fully understood. We prove that the positron spectroscopy can help in optimising technological questions of reduction processes.
Structural and electrical transport studies of reduced in hydrogen surface of bismuth germanate glass
Kusz
, p. 623 - 627 (2008/10/08)
Bismuth nanoclusters embedded in germanate glass matrices and surface layer of bismuth grains have been obtained by thermal treatment in hydrogen atmosphere of Bi0.33Ge0.67O1.83 glass. Confirmed by AFM and XRD measurements a simple model of two conducting layers is proposed. The influence of time and temperature of reduction on the properties of the reduced samples have been studied. A change in surface conductivity caused by melting of Bi granules has been observed in all studied samples. The possibility of existence of a superconducting state in reduced bismuth germanate glasses has been discussed.
