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Growth and characterization by STM of BiCo222 crystal objects: whiskers and bows

M. BURDUSEL1, L. MIU1, P.H. ZHAO2, W. YAN2, Y.L. HAN2, J.C. NIE2, P. BADICA1,*

Affiliation

  1. National Institute of Materials Physics, Atomistilor 105bis, Magurele 077125, Romania
  2. Beijing Normal University, Physics Department, Beijing 100875, Peoples R China

Abstract

Lamellar crystal objects such as straight, curved or kinked whiskers, bows and objects with missing stripes were grown in a static air atmosphere from melt-quenched substrates with starting composition Bi1.5Sr1Ca1Co0.6Oy. The average EDS composition of the objects is Bi2Sr0.75Ca1.8Co1.94Oy and the crystal structure is of the phase usually denoted in the literature as Bi2(Sr,Ca)2Co2Oy (BiCo222). Objects of other phases were not found. Curvature is in the (ab)-plane. By scanning tunneling spectroscopy (STS) a semiconducting energy gap was determined at 2.41 eV..

Keywords

Bi-Sr-Ca-Co-O, Whiskers, Bows, Scanning tunneling microscopy.

Submitted at: Jan. 7, 2015
Accepted at: March 19, 2015

Citation

M. BURDUSEL, L. MIU, P.H. ZHAO, W. YAN, Y.L. HAN, J.C. NIE, P. BADICA, Growth and characterization by STM of BiCo222 crystal objects: whiskers and bows, Journal of Optoelectronics and Advanced Materials Vol. 17, Iss. 3-4, pp. 426-430 (2015)