ON LEAD POWDER ELEMENTARY CELL PROPERTIES VARIATION UNDER CRYOGENIC CONDITIONS

Marius BĂRĂIAN, George Arghir, Ioan Petean

Abstract


Lead is a very important metallic material because of its using in anti radiation shields and in ecological recharging batteries. This purpose of this article is the investigation of the lead elementary cell properties under cryogenic conditions. The X-ray diffraction analysis performed at low temperatures proves that crystal parameter decreases linearly with temperature which implies a linear variation of volume and density of elementary cell. The volume presents a strong decreasing with temperature meanwhile density is proportional increased. The increasing of density directly proportional with temperature decreasing makes lead suitable as anti radiation shield under cryogenic conditions. There were calculated the values of lead elementary cell: crystal parameter 492.46 pm, elementary cell volume 119.43 pm3, and the density of 11.524 g/cm3at 0K.

Key words: lead powder, low temperature, elementary cell.

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