High-pressure synthesis of superconducting Nb1-xB2 (x = 0-0.48) with the maximum Tc = 9.2 K

Ayako Yamamoto, Chigaku Takao, Takahiko Masui, Mitsuru Izumi, Setsuko Tajima

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Superconductivity with Tc above 9 K was found in metal-deficient NbB2 prepared under 5 GPa, while no clear superconductivity was observed down to 3 K in stoichiometric NbB2. The superconductivity was observed above x = 0.04 in Nb1-xB2, and the lattice parameters also changed abruptly at x = 0.04. As x increased, the transition temperature Tc slightly rose and fell with the maximum value of 9.2 K at x = 0.24 for the samples sintered at 5 GPa and 1200 °C. The Tc-value changed in the range from 7 to 9 K, depending on the sintering pressure. A series of Ta1-xB2 (0 ≤ x ≤ 0.24) was also synthesized under high pressure to examine a special effect of high-pressure synthesis.

Original languageEnglish
Pages (from-to)197-206
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume383
Issue number3
DOIs
Publication statusPublished - 2002 Dec 15
Externally publishedYes

Fingerprint

Superconductivity
superconductivity
synthesis
Special effects
Superconducting transition temperature
Lattice constants
lattice parameters
sintering
Sintering
Metals
transition temperature
metals

Keywords

  • High-pressure synthesis
  • NbB
  • Niobium diboride
  • Superconductivity
  • Tantalum diboride

ASJC Scopus subject areas

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

Cite this

High-pressure synthesis of superconducting Nb1-xB2 (x = 0-0.48) with the maximum Tc = 9.2 K. / Yamamoto, Ayako; Takao, Chigaku; Masui, Takahiko; Izumi, Mitsuru; Tajima, Setsuko.

In: Physica C: Superconductivity and its Applications, Vol. 383, No. 3, 15.12.2002, p. 197-206.

Research output: Contribution to journalArticle

Yamamoto, Ayako ; Takao, Chigaku ; Masui, Takahiko ; Izumi, Mitsuru ; Tajima, Setsuko. / High-pressure synthesis of superconducting Nb1-xB2 (x = 0-0.48) with the maximum Tc = 9.2 K. In: Physica C: Superconductivity and its Applications. 2002 ; Vol. 383, No. 3. pp. 197-206.
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