Sökning: onr:"swepub:oai:research.chalmers.se:162a3ad2-2131-49d7-b15e-0549fa95bbe3" >
Proton conductivity...
Proton conductivity in Ln1.96Ca0.04Sn2O7-δ (Ln = La, Sm, Yb) pyrochlores as a function of the lanthanide size
-
- Eurenius, Karinh, 1980 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
-
- Ahlberg, Elisabet, 1952 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
-
- Knee, Christopher, 1973 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry
-
(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- Engelska.
-
Ingår i: Solid State Ionics. - : Elsevier BV. - 0167-2738. ; 181:27-28, s. 1258-1263
- Relaterad länk:
-
http://dx.doi.org/10...
-
visa fler...
-
https://research.cha...
-
https://doi.org/10.1...
-
https://gup.ub.gu.se...
-
visa färre...
Abstract
Ämnesord
Stäng
- The proton conductivity in tin-based pyrochlores, Ln1.96Ca0.04Sn2O7-δ (Ln = La, Sm, Yb), has been investigated. Samples were prepared by conventional solid state sintering methods. Fractions of the powders were vacuum dried, protonated and deuterated so that infrared spectroscopy and thermogravimetric analysis could be carried out to study proton incorporation. Electrochemical impedance spectroscopy was used to characterise the conductivities of the sample. The bulk conductivity was higher in wet gas compared to the dry runs at temperatures below approximately 500 °C for all samples. The level of proton conductivity was found to depend critically on the lanthanide size, and was highest for the largest La and mid-sized Sm ions, σH+ ≈ 4 × 10−7 Scm−1 at 300 °C, before falling sharply for the Yb-ion, σH+ ≈ 7 × 10−9 Scm−1. Evidence from TGA and IR analyses indicates that the tendency for proton absorption was strongly influenced by the lanthanide size, being greatest for La1.96Ca0.04Sn2O7-δ. The results suggest that both proton concentration and proton mobility vary depending on the size of the A-site ion.
Ämnesord
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Nyckelord
- Pyrochlore
- Proton conductor
- Thermogravimetric analysis
- Lanthanide contraction
- Electrochemical impedance spectroscopy
- Infrared spectroscopy
- Proton conductor; Lanthanide contraction; Pyrochlore; Electrochemical impedance spectroscopy; Infrared spectroscopy; Thermogravimetric analysis
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas