The electrical properties of dense nanocrystalline ceramics with an average grain size of 35 nm were investigated by impedance spectroscopy and compared with a coarsened material with micron size grains. The nanocrystalline ceramics show an uncommon domain of ionic conductivity at high oxygen pressures and a steep increase of electronic conductivity at low oxygen pressures. These results are discussed in terms of defect chemical models. The enthalpy of reduction of the nanocrystalline was deduced to be significantly lower than that of the coarsened material. This may be related to lower defect formation energies at interface sites.
REFERENCES
1.
C. J.
Barbe
, F.
Arendse
, P.
Comte
, M.
Jirousek
, F.
Lenzmann
, V.
Shklover
, and M.
Grätzel
, J. Am. Ceram. Soc.
80
, 3157
(1997
).2.
3.
4.
Y.-M.
Chiang
, E. B.
Lavik
, I.
Kosacki
, H. L.
Tuller
, and J. Y.
Ying
, Appl. Phys. Lett.
69
, 185
(1996
).5.
Y.-M.
Chiang
, E. B.
Lavik
, I.
Kosacki
, H. L.
Tuller
, and J. Y.
Ying
, J. Electroceram.
1
, 7
(1997
).6.
Y.-M.
Chiang
, E. B.
Lavik
, and D. A.
Blom
, Nanostruct. Mater.
9
, 633
(1997
).7.
8.
P. Knauth and H. L. Tuller, Proceedings of the U.S.–Japan Workshop, edited by H. Yanagida and H. L. Tuller (Cambridge, 1998), p. 15.
9.
O. Porat, H. L. Tuller, E. B. Lavik, and Y.-M. Chiang, in Nanophase and Nanocomposite Materials II, edited by S. Komarneni, J. Parker, and H. Wollenberger (Materials Research Society, Pittsburgh, 1997), p. 99.
10.
J. A. S.
Ikeda
and Y.-M.
Chiang
, J. Am. Ceram. Soc.
76
, 2437
(1993
).11.
12.
13.
K.
Hoshino
, N. L.
Peterson
, and C. L.
Wiley
, J. Phys. Chem. Solids
46
, 1397
(1985
).14.
M. A. Spears and H. L. Tuller (unpublished).
15.
F.
Millot
, M.-G.
Blanchin
, R.
Tetot
, J.-F.
Marucco
, B.
Poumellec
, C.
Picard
, and B.
Touzelin
, Prog. Solid State Chem.
17
, 263
(1987
).16.
A.
Bernasik
, M.
Rekas
, M.
Sloma
, and W.
Weppner
, Solid State Ionics
72
, 12
(1994
).17.
W. Büchner, R. Schliebs, G. Winter, and K. H. Büchel, Industrial Inorganic Chemistry (VCH, Weinheim, 1989).
18.
19.
20.
I.
Kosacki
and H.
Anderson
, Mater. Res. Soc. Symp. Proc.
453
, 537
(1997
).21.
22.
23.
M.
Aoki
, Y.-M.
Chiang
, I.
Kosacki
, L. J.-R.
Lee
, H.
Tuller
, and Y.
Liu
, J. Am. Ceram. Soc.
79
, 1169
(1996
).24.
R. N.
Blumenthal
, J. C.
Kirk
, and W. M.
Hirthe
, J. Phys. Chem. Solids
28
, 1077
(1967
).25.
26.
J. F.
Baumard
, D.
Panis
, and D.
Ruffier
, Rev. Int. Hautes Temp. Refract.
12
, 321
(1975
).27.
J. F.
Marucco
, J.
Gautron
, and P.
Lemasson
, J. Phys. Chem. Solids
42
, 363
(1981
).28.
29.
H. L. Tuller, J. Claus, and T. Chen, Fourth Euro Ceramics, Vol. 5, Electroceramics, edited by G. Gusmano and E. Traversa (Faenza, 1995), p. 443.
30.
This content is only available via PDF.
© 1999 American Institute of Physics.
1999
American Institute of Physics
You do not currently have access to this content.
