Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Effect of Na Substitution for the Ca Site in the Bi$_2$Sr$_2$Ca$_{1-x}$Na$_x$Cu$_2$O$_{8+y}$ Superconductors

Bi$_2$Sr$_2$Ca$_{1-x}$Na$_x$Cu$_2$O$_{8+y}$ 산화물 고온초전도체의 Ca 위치에 Na 치환 효과

  • 이민수 (한남대학교 이과대학 물리학과) ;
  • 송승용 (한남대학교 이과대학 물리학과) ;
  • 이종용 (한남대학교 이과대학 물리학과) ;
  • 송기영 (한남대학교 이과대학 물리학과) ;
  • 최봉수 (한남대학교 이과대학 물리학과)
  • Published : 1998.10.01
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Abstract

The samples of Bi2Sr2Ca1-xNaxCu2O8+y with various carrier concentration were synthesized by substituting Na for Ca ion. The superconducting properties hall coefficients and X-ray powder diffraction were measur-ed the sampled. Single phase samples were obtained for 0$\leq$x<0.3 of Bi2Sr2Ca1-xNaxCu2O8+y In the single phase the critical temperature. {{{{ { T}_{c } }} and carrier concentration increase with the increase of Na concentration pass through a maximum and then decreases. In the range of x$\geq$0.7 to the Na doped samples however we observed the metal-semiconductor transition. The c-axis seemed to decrease and a and b-axes increase with increasing Na concentration in the single phase. Decreasing of c-axis while increasing x is due to the smaller size of {{{{ {Na}^{+1 } }} ions to the {{{{ { Ca}^{+2 } }} ions. In the range of x>0.3 however the trend becomes ambiguous due to the inclusion of the 10K phase and impurity phase.

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