Lattice Parameter of Polycrystalline Diamond in the Low-Temperature Range

W. Paszkowicza, P. Piszorab, W. Łasochac, d, I. Margiolakie, M. Brunellie and A. Fitche a Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warszawa, Poland b Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland c Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland d Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Kraków, Poland e European Synchrotron Radiation Facility (ESRF) 6, rue Jules Horowitz, BP 220, 38043 Grenoble Cedex, France

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The lattice parameter for polycrystalline diamond is determined as a function of temperature in the 4-300 K temperature range. In the range studied, the lattice parameter, expressed in angstrom units, of the studied sample increases according to the equation a = 3.566810(12) + 6.37(41) × 10-14 T4 (approximately, from 3.5668 to 3.5673 Å). This increase is larger than that earlier reported for pure single crystals. The observed dependence and the resulting thermal expansion coefficient are discussed on the basis of literature data reported for diamond single crystals and polycrystals.

DOI: 10.12693/APhysPolA.117.323 PACS numbers: 61.82.Fk, 65.40.De