Inhomogeneities and segregation behavior in strontium-barium niobate fibers grown by laser-heated pedestal growth technique. Part I
| Autor: | Ludwig Galambos, Robert S. Feigelson, Lambertus Hesselink, Isao Tanaka, L. E. Cross, S. Erdei, F.W. Ainger, Hironao Kojima |
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| Rok vydání: | 1996 |
| Předmět: |
Microprobe
Materials science Scanning electron microscope Inorganic chemistry Analytical chemistry Crystal orientation Strontium barium niobate Condensed Matter Physics Radial direction Inorganic Chemistry Core (optical fiber) chemistry.chemical_compound Pedestal chemistry Materials Chemistry Laser-heated pedestal growth |
| Zdroj: | Journal of Crystal Growth. 167:660-669 |
| ISSN: | 0022-0248 |
| DOI: | 10.1016/0022-0248(96)00322-3 |
| Popis: | In order to study these inhomogeneities, Ce-doped and undoped strontium-barium niobate (SBN) fibers were grown by a laser-heated pedestal growth (LHPG) technique in various Ce:Sr x Ba 1− x Nb 2 O 6 compositions along both c [001] and a [100] crystallographic axes. Specific optical inhomogeneities distributed in a radial manner (core effects) are observed in such crystals. Two-dimensional scanning electron microprobe analysis (SEPMA) indicated Ba enrichment and Sr decrease in the cores. An approximate control segregation coefficient (' k oA ) was introduced to characterize the segregation in the fibers. For different cations ' k oSr = 0.98, ' k oBa = 1.04 and ' k oNb = 0.99 were obtained which both determine and demonstrate the complexity of the inhomogeneities in the core in the radial direction. |
| Databáze: | OpenAIRE |
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