Search: onr:"swepub:oai:DiVA.org:su-43895" >
Synthesis and chara...
Synthesis and characterization of reduced niobates CaLnNb2O7, Ln = Y, Nd with a pyrochlore structure
-
- Istomin, S Y (author)
- Moscow State University, Department of Chemistry
-
- Dyachenko, O G (author)
- Moscow State University, Department of Chemistry
-
- Antipov, E V (author)
- Moscow State University, Department of Chemistry
-
show more...
-
- Svensson, Gunnar, 1960- (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK)
-
show less...
-
(creator_code:org_t)
- 1997
- 1997
- English.
-
In: Materials research bulletin. - 0025-5408 .- 1873-4227. ; 32:4, s. 421-430
- Related links:
-
https://urn.kb.se/re...
-
show more...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- The first known reduced niobates with a pyrochlore structure, CaLnNb(2)O(7) Ln = Y, Nd, have been synthesized from Ca2Nb2O7, Ln(2)O(3), and NbO2 in sealed Nb ampoules heated at 1400 degrees C for 6 h. Our studies show that these compounds have a small homogeneity region according to the formula Ca(2-x)Ln(x)Nb(2)O(7), Ln = Nd with x = 0.9, 1.0; and Ln = Y with x = 1.0, 1.1. The prepared compounds were characterized by EDX (energy dispersive X-ray) analysis, X-ray and electron diffraction, and thermogravimetric analysis. The crystal structures of CaNdNb2O7 and CaYNb2O7 were refined using X-ray and neutron powder diffraction data. CaNdNb2O7 and CaYNb2O7 have undistorted pyrochlore structures: space group Fd3m, a = 10.416(1) Angstrom and 10.3159(8) Angstrom, respectively. Resistivity measurements show that CaNdNb2O7 exhibits semiconducting behavior. Copyright (C) 1997 Elsevier Science Ltd.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- oxides
- chemical synthesis
- X-ray diffraction
- crystal structure
- electric properties
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database