Synthesis and characterization of Pt(Cu0.67Sn0.33)
- Goethe University, Frankfurt (Germany); University Del Papaloapan, Tuxtepec, Oaxaca (Mexico)
- Goethe University, Frankfurt (Germany)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Cherepovets State University (Russian Federation)
- Dassault Systemes BIOVIA, Cambridge (United Kingdom)
- Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Pt(Cu0.67Sn0.33) has recently been found in a natural sample. In order to be able to characterize this new ternary compound, we synthesized it from the elements. Samples were characterized by X-ray powder diffraction, differential scanning calorimetry, thermal relaxation calorimetry, and scanning electron microscopy studies. Density functional theory-based model calculations complemented the experimental studies. Pt(Cu0.67Sn0.33)was already formed at a relatively low temperature of 773 K. Rietveld refinement of Pt(Cu0.67Sn0.33) has been carried out in CuAu-type or L10-type structure, space group P4/mmm, with Pt on 0,0,0 and disordered Cu and Sn on 1/2, 1/2, 1/2 and Z = 1. The lattice parameters are a = 2.823(1) Å, c = 3.64(1) Å, and V = 29.00(4) Å which are in good agreement with values obtained earlier on the natural sample and with the results of DFT calculations. The vibrational entropy for Pt(Cu0.67Sn0.33) is $$S_{298.15}^{vib}$$ = 79.9(7) J mol-1 K-1. The pressure dependence up to 36(2) GPa of the unit-cell volume and the lattice parameters and unit-cell volume have been obtained by synchrotron based powder diffraction using a diamond anvil cell. A fit of a 3rd-order Birch–Murnaghan equation of state to the Pt(Cu0.67Sn0.33)) (p,V)-data results in a bulk modulus of B0 = 215(27) GPa and B' = 5(2).
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); Federal Ministry of Education and Research (BMBF); Frankfurt University
- Grant/Contract Number:
- AC02-05CH11231; Wi-1232; DFG FOR 2125
- OSTI ID:
- 1788005
- Alternate ID(s):
- OSTI ID: 1694047
- Journal Information:
- Solid State Sciences, Vol. 105; ISSN 1293-2558
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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