Cieslak J, Dubiel SM, Reissner M. Site occupancy and lattice parameters in sigma-phase Co-Cr alloys.
ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 2012;
68:123-7. [PMID:
22436910 DOI:
10.1107/s0108768112006234]
[Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2011] [Accepted: 02/12/2012] [Indexed: 11/11/2022]
Abstract
Neutron powder diffraction was used to study the distribution of Co and Cr atoms over different lattice sites as well as the lattice parameters of sigma-phase compounds Co(100 - x)Cr(x) with x = 57.0, 62.7 and 65.8. From the diffractograms recorded in the temperature range of 4.2-300 K it was found for the five crystallographically independent sites that A (2a) and D (8i) are predominantly occupied by Co atoms, while sites B (4f), C (8i) and E (8j) mainly accommodate Cr atoms. The lattice parameters a and c exhibit linear temperature dependencies, with different expansion coefficients in the temperature ranges of 4.2-100 and 100-300 K.
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