Platinum Metals Review - Volume 57, Issue 2, 2013

In 2011, the newest group of layered high-temperature superconductors were discovered: platinum-based quaternary 10-4-8 (Ca10(Pt4As8)(Fe2As2)5) and 10-3-8 ((CaFe1–xPtxAs)10Pt3As8) phases with superconducting transition temperatures (TC) up to 35–38 K. Intensive studies have been carried out to investigate their preparation and properties. This finding stimulated much activity in search of related materials and has attracted increased attention to platinum as a component of layered superconductors. This review presents experimental and theoretical results devoted to two main groups of superconducting materials with platinum: Pt-based materials (where Pt forms individual sub-lattices inside building blocks of corresponding phases such as SrPtAs, SrPt2As2 and LaPt2B2C) and Pt-containing materials, where Pt acts as a dopant. Synthesis, basic properties and simulation of these materials are covered.

The founders of Johnson Matthey – Percival Johnson and George Matthey – played important roles in the foundation and running of the Chemical Society, which was founded in 1841. This tradition continues today with the Royal Society of Chemistry and Johnson Matthey Plc.

The crystallographic properties of ruthenium at temperatures from absolute zero to the melting point at 2606 K are assessed following a review of the literature published between 1935 and to date. Selected values of the thermal expansion coefficients and measurements of length changes due to thermal expansion have been used to calculate the variation with temperature of the lattice parameters, interatomic distances, atomic and molar volumes and densities. The data is presented in the form of Figures, Equations and Tables.