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Structure and prope...
Structure and properties of Ba6 − xLnxNb10O30, Ln = La, Ce and Nd compounds
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Dyachenko, O G (författare)
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Istomin, S Y (författare)
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Fedotov, M M (författare)
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Antipov, E V (författare)
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- Svensson, Gunnar, 1960- (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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- Nygren, Mats (författare)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
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Holm, W (författare)
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(creator_code:org_t)
- 1997
- 1997
- Engelska.
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Ingår i: Materials research bulletin. - 0025-5408 .- 1873-4227. ; 32:4, s. 409-419
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Ba6 − xLnxNb10O30 compounds, Ln = La, Ce and Nd, with a tetragonal tungsten bronze-type structure have been synthesized and were characterized by X-ray powder diffraction and EDS analysis. The homogeneity regions of the obtained compounds were found to be 0 ≤ x ≤ 2 for La, and 0 ≤ x ≤ 1.5 for Ce and Nd. The crystal structures of Ba5LaNb10O30 and Ba4La2Nb10O30 were refined using X-ray powder diffraction data. Refinement indicated the presence of vacancies in the positions. This observation was supported by oxidation studies of the La-substituted compounds. The temperature dependence of the normalized resistivity of the compounds showed a nonmetallic behavior. The increase in the ratio with decreasing temperature is less distinct for the phases with the higher concentration of rare-earth cation.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- oxides
- chemical synthesis
- X-ray diffraction
- crystal structure
- electric properties
- Chemistry
- Kemi
- Materials Chemistry
- materialkemi
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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