TY - JOUR
T1 - Measurement of charge of Cu and O in YBa2Cu3Oy by energy-filtering convergent-beam electron diffraction
AU - Akase, Z.
AU - Tomokiyo, Y.
AU - Tanaka, Y.
AU - Watanabe, M.
N1 - Funding Information:
Most of the results presented here were obtained with facilities at the HVEM Laboratory, Kyushu University. The authors should like to express their gratitude to Messrs. E. Tanaka and T. Manabe for their assistance in the operation of the microscopes. The work was partly supported by the Grants-in-Aid for scientific research from Japan Society for the Promotion of Science and by Proposal-Based New Industry Creative Technology R&D Promotion Program, No. 98S03-009-2.
PY - 2000/8/1
Y1 - 2000/8/1
N2 - Large-angle convergent-beam electron diffraction (CBED) patterns were observed from small areas in nanometer scale in YBa2Cu3Oy (Y123), using a new transmission electron microscope (TEM) JEM-2010FEF. An energy filter of omega type was used to subtract background intensities caused by inelastically scattered electron. Specimens were cooled with a liquid nitrogen stage to suppress thermal diffuse scattering that cannot be eliminated well by the energy filter. In order to measure specimen thickness, electron energy loss spectra were also measured from the same areas where CBED patterns were recorded. Charges of Cu and O on CuO chains and CuO2 planes, and charge of O on Ba-O planes were determined by analyzing the intensities of CBED patterns with the dynamical theory of electron diffraction. The obtained values are Cu2.0+ and O1.65- on CuO chains, Cu2.2+ and O1.98- on CuO2 planes and O2.0- on BaO planes. The present results indicate that the energy-filtering CBED technique is useful for determination of charge distribution along the z-direction in Y123.
AB - Large-angle convergent-beam electron diffraction (CBED) patterns were observed from small areas in nanometer scale in YBa2Cu3Oy (Y123), using a new transmission electron microscope (TEM) JEM-2010FEF. An energy filter of omega type was used to subtract background intensities caused by inelastically scattered electron. Specimens were cooled with a liquid nitrogen stage to suppress thermal diffuse scattering that cannot be eliminated well by the energy filter. In order to measure specimen thickness, electron energy loss spectra were also measured from the same areas where CBED patterns were recorded. Charges of Cu and O on CuO chains and CuO2 planes, and charge of O on Ba-O planes were determined by analyzing the intensities of CBED patterns with the dynamical theory of electron diffraction. The obtained values are Cu2.0+ and O1.65- on CuO chains, Cu2.2+ and O1.98- on CuO2 planes and O2.0- on BaO planes. The present results indicate that the energy-filtering CBED technique is useful for determination of charge distribution along the z-direction in Y123.
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U2 - 10.1016/S0921-4534(00)00216-1
DO - 10.1016/S0921-4534(00)00216-1
M3 - Conference article
AN - SCOPUS:0034248351
SN - 0921-4534
VL - 338
SP - 137
EP - 143
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 1
T2 - International Discussion Meeting on Chemistry Approaches to High-Tc Superconductive Materials / 5th International Workshop on Chemical Designing and Processing of High-Tc Superconductors (Chem-HTSC-V)
Y2 - 15 October 1999 through 16 October 1999
ER -