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Lattice Parameter of Polycrystalline Diamond in the Low-Temperature Range

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Paszkowicz W., Piszora P., Łasocha W., Margiolaki I., Brunelli M.

Acta Physica Polonica A

2010

vol. 117

issue 2

323-327

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} T^{4} (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.

Thermal Lattice Parameters Variation of CaCu_xMn_{7-x}O_{12} Compounds with Trigonal Crystal Structure

100%

Sławiński W., Przeniosło R., Sosnowska I., Bieringer M., Margiolaki I.

Acta Physica Polonica A

2008

vol. 113

issue 4

1225-1230

We report the crystal structure evolution of CaCu_{0.2}Mn_{6.8}O_{12} as a function of temperature between 10 K and 290 K. The analysis of the diffraction data is carried out with the Rietveld method applied to the average trigonal structure of CaCu_{0.2}Mn_{6.8}O_{12}. The x = 0.2 member shows similar low temperature extrema for the unit cell parameter evolution as the previously reported x = 0.1 and x = 0 members of the CaCu_xMn_{7-x}O_{12} system. All magnetic and crystallographic transition temperatures indicated by the unit cell parameter evolution obtained by powder X-ray diffraction methods systematically decrease with increasing Cu content, x.

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2 Acta Physica Polonica A

1 2010

1 2008

2 Margiolaki I.

1 Bieringer M.

1 Brunelli M.

1 Paszkowicz W.

1 Piszora P.

1 Przeniosło R.

1 Sosnowska I.

1 Sławiński W.

1 Łasocha W.

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Lattice Parameter of Polycrystalline Diamond in the Low-Temperature Range

Thermal Lattice Parameters Variation of CaCu_xMn_{7-x}O_{12} Compounds with Trigonal Crystal Structure