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

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

Research output: Contribution to journalArticle

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 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.

Original languageEnglish
Pages (from-to)250-256
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume216
Issue number3-4
DOIs
Publication statusPublished - 1993 Nov 1
Externally publishedYes

Fingerprint

Superconductivity
Superconducting materials
Crystal structure
crystal structure
Chemical analysis
Energy dispersive X ray analysis
X ray powder diffraction
Oxides
superconductivity
Volume fraction
Sintering
Electrons
Temperature
sintering
x rays
direct current
magnetic permeability
oxides
high resolution
cells

ASJC Scopus subject areas

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

Cite this

Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors. / Yamamoto, Ayako; Isawa, Kazuyuki; Itoh, Makoto; Adachi, Seiji; Yamauchi, H.

In: Physica C: Superconductivity and its Applications, Vol. 216, No. 3-4, 01.11.1993, p. 250-256.

Research output: Contribution to journalArticle

Yamamoto, Ayako ; Isawa, Kazuyuki ; Itoh, Makoto ; Adachi, Seiji ; Yamauchi, H. / Composition, crystal structure and superconducting properties of HgBaCuO and HgBaCaCuO superconductors. In: Physica C: Superconductivity and its Applications. 1993 ; Vol. 216, No. 3-4. pp. 250-256.
@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 Yamamoto and Kazuyuki Isawa and Makoto Itoh and Seiji Adachi and H. Yamauchi",
year = "1993",
month = "11",
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 - 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 -