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Title: Synthesis and characterization of Pt(Cu0.67Sn0.33)

Journal Article · · Solid State Sciences
 [1];  [2];  [2];  [2];  [3];  [3];  [2];  [2];  [4];  [5];  [6];  [6];  [6];  [6];  [2]
  1. Goethe University, Frankfurt (Germany); University Del Papaloapan, Tuxtepec, Oaxaca (Mexico)
  2. Goethe University, Frankfurt (Germany)
  3. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Cherepovets State University (Russian Federation)
  5. Dassault Systemes BIOVIA, Cambridge (United Kingdom)
  6. 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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