Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors

Ayako Tokiwa-Yamamoto; Kazuyuki Isawa; Makoto Itoh; Seiji Adachi; H. Yamauchi

doi:10.1016/0921-4534(93)90068-2

Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors

Ayako Tokiwa-Yamamoto, Kazuyuki Isawa, Makoto Itoh, Seiji Adachi, H. Yamauchi

Global course of Engineering and Science

Research output: Contribution to journal › Article

44 Citations (Scopus)

Abstract

The composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors were investigated. Samples with various nominal compositions were prepared from the mono-oxides of Hg, Ba, Ca and Cu using various sintering processes. The samples were examined by X-ray powder diffraction and energy dispersive X-ray analysis (EDX). The HgBaCuO samples were found to be nearly single phases of HgBa₂CuO_4+δ (Hg-1201), but the HgBa CaCuO samples contained HgBa₂Ca₂Cu₃O_8+δ (Hg-1223), HgBa₂CaCu₂O_6+δ (Hg-1212) and other phases. The fraction of the higher-T_c phase in the HgBaCaCuO sample varied in accordance with the nominal composition. High-resolution transmission electron microscopic (HRTEM) studies revealed the existence of Hg-1201 (tetragonal cell with a=3.85 and c=9.5 A ̊), Hg-1212 (c=12.6 A ̊). and Hg-1223 structures (c=15.7 A ̊). Most of the HgBaCuO samples exhibit 95 K-classs superconductivity, and the Hg BaCaCuO samples showed 130 K-class superconductivity. The highest Meissner onset temperature, T_cm determined from DC susceptibility was 134 K. The same sample showed superconductivity with a ≈ 16% diamagnetic volume fraction at 5 K.

Original language	English
Pages (from-to)	250-256
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	216
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90068-2
Publication status	Published - 1993 Nov 1

Fingerprint

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Cite this

Tokiwa-Yamamoto, A., Isawa, K., Itoh, M., Adachi, S., & Yamauchi, H. (1993). Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors. Physica C: Superconductivity and its applications, 216(3-4), 250-256. https://doi.org/10.1016/0921-4534(93)90068-2

@article{c8031654a19843a0b1b781766d9d0555,

title = "Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors",

abstract = "The composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors were investigated. Samples with various nominal compositions were prepared from the mono-oxides of Hg, Ba, Ca and Cu using various sintering processes. The samples were examined by X-ray powder diffraction and energy dispersive X-ray analysis (EDX). The HgBaCuO samples were found to be nearly single phases of HgBa2CuO4+δ (Hg-1201), but the HgBa CaCuO samples contained HgBa2Ca2Cu3O8+δ (Hg-1223), HgBa2CaCu2O6+δ (Hg-1212) and other phases. The fraction of the higher-Tc phase in the HgBaCaCuO sample varied in accordance with the nominal composition. High-resolution transmission electron microscopic (HRTEM) studies revealed the existence of Hg-1201 (tetragonal cell with a=3.85 and c=9.5 A ̊), Hg-1212 (c=12.6 A ̊). and Hg-1223 structures (c=15.7 A ̊). Most of the HgBaCuO samples exhibit 95 K-classs superconductivity, and the Hg BaCaCuO samples showed 130 K-class superconductivity. The highest Meissner onset temperature, Tcm determined from DC susceptibility was 134 K. The same sample showed superconductivity with a ≈ 16% diamagnetic volume fraction at 5 K.",

author = "Ayako Tokiwa-Yamamoto and Kazuyuki Isawa and Makoto Itoh and Seiji Adachi and H. Yamauchi",

year = "1993",

month = nov

day = "1",

doi = "10.1016/0921-4534(93)90068-2",

language = "English",

volume = "216",

pages = "250--256",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "3-4",

}

TY - JOUR

T1 - Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors

AU - Tokiwa-Yamamoto, Ayako

AU - Isawa, Kazuyuki

AU - Itoh, Makoto

AU - Adachi, Seiji

AU - Yamauchi, H.

PY - 1993/11/1

Y1 - 1993/11/1

N2 - The composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors were investigated. Samples with various nominal compositions were prepared from the mono-oxides of Hg, Ba, Ca and Cu using various sintering processes. The samples were examined by X-ray powder diffraction and energy dispersive X-ray analysis (EDX). The HgBaCuO samples were found to be nearly single phases of HgBa2CuO4+δ (Hg-1201), but the HgBa CaCuO samples contained HgBa2Ca2Cu3O8+δ (Hg-1223), HgBa2CaCu2O6+δ (Hg-1212) and other phases. The fraction of the higher-Tc phase in the HgBaCaCuO sample varied in accordance with the nominal composition. High-resolution transmission electron microscopic (HRTEM) studies revealed the existence of Hg-1201 (tetragonal cell with a=3.85 and c=9.5 A ̊), Hg-1212 (c=12.6 A ̊). and Hg-1223 structures (c=15.7 A ̊). Most of the HgBaCuO samples exhibit 95 K-classs superconductivity, and the Hg BaCaCuO samples showed 130 K-class superconductivity. The highest Meissner onset temperature, Tcm determined from DC susceptibility was 134 K. The same sample showed superconductivity with a ≈ 16% diamagnetic volume fraction at 5 K.

AB - The composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors were investigated. Samples with various nominal compositions were prepared from the mono-oxides of Hg, Ba, Ca and Cu using various sintering processes. The samples were examined by X-ray powder diffraction and energy dispersive X-ray analysis (EDX). The HgBaCuO samples were found to be nearly single phases of HgBa2CuO4+δ (Hg-1201), but the HgBa CaCuO samples contained HgBa2Ca2Cu3O8+δ (Hg-1223), HgBa2CaCu2O6+δ (Hg-1212) and other phases. The fraction of the higher-Tc phase in the HgBaCaCuO sample varied in accordance with the nominal composition. High-resolution transmission electron microscopic (HRTEM) studies revealed the existence of Hg-1201 (tetragonal cell with a=3.85 and c=9.5 A ̊), Hg-1212 (c=12.6 A ̊). and Hg-1223 structures (c=15.7 A ̊). Most of the HgBaCuO samples exhibit 95 K-classs superconductivity, and the Hg BaCaCuO samples showed 130 K-class superconductivity. The highest Meissner onset temperature, Tcm determined from DC susceptibility was 134 K. The same sample showed superconductivity with a ≈ 16% diamagnetic volume fraction at 5 K.

UR - http://www.scopus.com/inward/record.url?scp=0027693814&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027693814&partnerID=8YFLogxK

U2 - 10.1016/0921-4534(93)90068-2

DO - 10.1016/0921-4534(93)90068-2

M3 - Article

AN - SCOPUS:0027693814

VL - 216

SP - 250

EP - 256

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

SN - 0921-4534

IS - 3-4

ER -

Access to Document

10.1016/0921-4534(93)90068-2