TY - JOUR
T1 - Space group determination of the BaY(Cu0.5Fe0.5)2O5+δ phase using a convergent-beam electron-diffraction technique
AU - Suematsu, H.
AU - Lindén, J.
AU - Nagase, M.
AU - Tomokiyo, Y.
AU - Karppinen, M.
AU - Yamauchi, H.
PY - 2004/6
Y1 - 2004/6
N2 - The space group of the BaY(Cu0.5Fe0.5) 2O5+δ (δ=0.03-0.17) phase was studied by selected-area electron diffraction and convergent-beam electron diffraction (CBED). The CBED patterns for BaY(Cu0.5Fe0.5) 2O5.03 grains taken from the zone axes of [111], [001] and [010] had the symmetries of m, 4mm and 2mm, respectively. Forbidden reflections were observed neither in selected-area electron diffraction nor in the CBED patterns. From these results, the space group of the BaY(Cu0.5Fe 0.5)2O5.03 was determined to be P4/mmm. Since the presence of a mirror plane parallel to the (Cu,Fe)O2 planes was confirmed, Cu and Fe were found to be randomly distributed in the (Cu,Fe)O 2 planes. The same analyses were performed for BaY(Cu 0.5Fe0.5)2O5.17 grains and the space group was also found to be P4/mmm. The change in the magnetic properties of BaY(Cu0.5Fe0.5)2O5+δ samples due to the high-pressure heat-treatment was concluded to be caused by excess of oxygen.
AB - The space group of the BaY(Cu0.5Fe0.5) 2O5+δ (δ=0.03-0.17) phase was studied by selected-area electron diffraction and convergent-beam electron diffraction (CBED). The CBED patterns for BaY(Cu0.5Fe0.5) 2O5.03 grains taken from the zone axes of [111], [001] and [010] had the symmetries of m, 4mm and 2mm, respectively. Forbidden reflections were observed neither in selected-area electron diffraction nor in the CBED patterns. From these results, the space group of the BaY(Cu0.5Fe 0.5)2O5.03 was determined to be P4/mmm. Since the presence of a mirror plane parallel to the (Cu,Fe)O2 planes was confirmed, Cu and Fe were found to be randomly distributed in the (Cu,Fe)O 2 planes. The same analyses were performed for BaY(Cu 0.5Fe0.5)2O5.17 grains and the space group was also found to be P4/mmm. The change in the magnetic properties of BaY(Cu0.5Fe0.5)2O5+δ samples due to the high-pressure heat-treatment was concluded to be caused by excess of oxygen.
KW - BaY(CuFe)O
KW - Convergent-beam electron diffraction
KW - High-pressure heat-treatment
KW - Magnetic property
KW - Space group
UR - http://www.scopus.com/inward/record.url?scp=3242691784&partnerID=8YFLogxK
U2 - 10.1016/j.jssc.2004.01.006
DO - 10.1016/j.jssc.2004.01.006
M3 - Article
AN - SCOPUS:3242691784
SN - 0022-4596
VL - 177
SP - 1958
EP - 1964
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 6
ER -