DIRECT OBSERVATION OF OXYGEN-ATOMS IN A TETRAGONAL YBA2CU3O7.7 HIGH-TC SUPERCONDUCTOR BY MEANS OF ULTRA-HIGH-RESOLUTION HIGH-VOLTAGE ELECTRON-MICROSCOPY

被引：14

作者：

HORIUCHI, S ^{[1
]}

MATSUI, Y ^{[1
]}

OKAI, B ^{[1
]}

机构：

[1] KOGAKUIN UNIV,FAC GEN EDUC,TOKYO 16391,JAPAN

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS | 1992年 / 31卷 / 1A-B期

关键词：

DIRECT OBSERVATION; OXYGEN ATOMS; TETRAGONAL YBA2CU3O7.7; HIGH-TC SUPERCONDUCTOR; UHR-HVEM; STRUCTURE DETERMINATION;

D O I：

10.1143/JJAP.31.L59

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Using an ultra-high-resolution high-voltage electron microscope (UHR-HVEM) recently installed at National Institute for Research in Inorganic Materials, a tetragonal YBa2Cu3O7.7 crystal was observed for the [001] as well as [100] orientations with the accelerating voltage of 800 kV, where the damage due to electron irradiation is rather suppressed. Dark spots from oxygens were directly detected in addition to those of Y, Ba and Cu atoms. As a result, the crystal structure was confirmed to be similar to that of the tetragonal YBa2Cu3O7-x (x > 0.5) crystal so far known. Excess oxygens are considered to be accommodated in the otherwise vacant oxygen sites.

引用

页码：L59 / L62

页数：4

共 6 条

[1] HORIUCHI S, IN PRESS ULTRAMICROS
[2] STRUCTURAL-PROPERTIES OF OXYGEN-DEFICIENT YBA2CU3O7-DELTA
JORGENSEN, JD
VEAL, BW
PAULIKAS, AP
NOWICKI, LJ
CRABTREE, GW
CLAUS, H
KWOK, WK
[J]. PHYSICAL REVIEW B, 1990, 41 (04): : 1863 - 1877
[3] MATSUI Y, IN PRESS ULTRAMICROS
[4] OGAWA K, IN PRESS PHYSICA C
[5] HIGH-OXYGEN-PRESSURE SYNTHESIS OF SUPERCONDUCTING TETRAGONAL YBA2CU3O7.7
OKAI, B
[J]. JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 1990, 29 (12): : L2193 - L2194
[6] OKAI B, 1991, JPN J APPL PHYS, V29, pL1378

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