Evidence of iso-structural phase transition in rhombohedral Bi-Sb alloy

K. Malik; Diptasikha Das; A. K. Deb; V. A. Kulbachinskii; Velaga Srihari; S. Bandyopadhyay; Aritra Banerjee

doi:10.1209/0295-5075/115/58001

All issues

Volume 115 / No 5 (September 2016)

EPL, 115 5 (2016) 58001

Abstract

Issue		EPL Volume 115, Number 5, September 2016


Article Number		58001
Number of page(s)		6
Section		Interdisciplinary Physics and Related Areas of Science and Technology
DOI		https://doi.org/10.1209/0295-5075/115/58001
Published online		29 September 2016

EPL, 115 (2016) 58001

Evidence of iso-structural phase transition in rhombohedral Bi-Sb alloy

K. Malik¹, Diptasikha Das², A. K. Deb³, V. A. Kulbachinskii⁴, Velaga Srihari⁵, S. Bandyopadhyay²^,6 and Aritra Banerjee²^,6^(a)

¹ Department of Physics, Vidyasagar Evening College - 39 Sankar Ghosh Lane, Kolkata-700006, India
² Department of Physics, University of Calcutta - 92 A P C Road, Kolkata-700009, India
³ Department of Physics, Raiganj University - Uttar Dinajpur-733134, India
⁴ Department of Low Temperature Physics and Superconductivity, Physics Faculty, M.V. Lomonosov Moscow State University - 119991, Moscow, Russia
⁵ High Pressure & Synchrotron Radiation Physics Division, Bhaba Atomic Research Centre - Mumbai-400085, India
⁶ Center for Research in Nanoscience and Nanotechnology, University of Calcutta - JD-2, Sector-III, Saltlake, Kolkata-700106, India

^(a) arbphy@caluniv.ac.in

Received: 8 June 2016
Accepted: 1 September 2016

Abstract

Temperature-dependent structural studies of polycrystalline Bi_1−xSb_x $(0.10 \leq x \leq 0.20)$ alloys were carried out using synchrotron x-ray diffraction. In-depth powder diffraction analysis reveals that an iso-structural phase transition takes place in the rhombohedral Bi-Sb alloy around 200 K, which is accompanied by anomalous behavior in the temperature-dependent linear thermal expansion data. In addition, the thermal variation of refined isotropic thermal parameters or Debye-Waller factor (B_iso), ratio $(a_{H}/c_{H})$ of the lattice parameters and Debye temperature $(\theta_{\mathrm{D}})$ indicates that anisotropy, arising due to local structural disorder, plays a significant role in this material.

PACS: 81.05.Bx – Metals, semimetals, and alloys / 65.90.+i – Other topics in thermal properties of condensed matter (restricted to new topics in section 65) / 61.05.cp – X-ray diffraction

© EPLA, 2016

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