Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Structural studies of nanocrystalline oxides
AU - Savin, S. L. P.
AU - Chadwick, A. V.
AU - O'Dell, L. A.
AU - Smith, Mark E.
PY - 2006/10/31
Y1 - 2006/10/31
N2 - We report the results of structural studies of samples of nanocrystalline tin oxide, zirconia, magnesia, alumina and silica, prepared by sol-gel techniques (including the addition of silica to restrict grain growth) and high-energy ball milling. XRD, EXAFS/YANES and MAS-NMR analyses were used to characterise the materials. EXAFS showed that nanocrystals of ZrO2 and SnO2 prepared by sol-gel methods are highly crystalline, consistent with previous EXAFS studies of sol-gel prepared nanocrystalline oxides [A.V Chadwick, M.J. Pooley, K.E. Rammutla, S.L.P. Savin, A. Rougier, J. Phys.: Condens. Matter, 15 (2003) 43 L; A.V Chadwick, G.E. Rush, in Nanocrystalline Metals and Oxides: Selected Properties and Applications, (Kluwer, New York), (2002), p. 133.]. In contrast, the sol-gel prepared SiO2 appeared amorphous, even after prolonged heating at 1200 degrees C. The EXAFS of the ball-milled samples showed clearly attenuated signals that cannot be attributed solely to particle size. Ball milling of quartz crystals (which have a simple Q(4)) first broadens the NMR line and then generates Q(3) and then Q(2) lines indicating the generation of amorphous materials in the samples.
AB - We report the results of structural studies of samples of nanocrystalline tin oxide, zirconia, magnesia, alumina and silica, prepared by sol-gel techniques (including the addition of silica to restrict grain growth) and high-energy ball milling. XRD, EXAFS/YANES and MAS-NMR analyses were used to characterise the materials. EXAFS showed that nanocrystals of ZrO2 and SnO2 prepared by sol-gel methods are highly crystalline, consistent with previous EXAFS studies of sol-gel prepared nanocrystalline oxides [A.V Chadwick, M.J. Pooley, K.E. Rammutla, S.L.P. Savin, A. Rougier, J. Phys.: Condens. Matter, 15 (2003) 43 L; A.V Chadwick, G.E. Rush, in Nanocrystalline Metals and Oxides: Selected Properties and Applications, (Kluwer, New York), (2002), p. 133.]. In contrast, the sol-gel prepared SiO2 appeared amorphous, even after prolonged heating at 1200 degrees C. The EXAFS of the ball-milled samples showed clearly attenuated signals that cannot be attributed solely to particle size. Ball milling of quartz crystals (which have a simple Q(4)) first broadens the NMR line and then generates Q(3) and then Q(2) lines indicating the generation of amorphous materials in the samples.
KW - EXAFS
KW - preparation methods
KW - nanocrystalline oxides
KW - NMR
U2 - 10.1016/j.ssi.2006.03.020
DO - 10.1016/j.ssi.2006.03.020
M3 - Journal article
VL - 177
SP - 2519
EP - 2526
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 26-32
T2 - 15th International Conference on Solid State Ionics
Y2 - 20 May 2005
ER -