Investigations of high pressure properties of different materials attract considerable interest of solid matter physics.

We investigate pressure influence on phase transitions of lead.

High pressure has been generated in the diamond anvil cell with Brindgmen anvils of the "rounded cone-plane" type made of synthetic diamonds called «carbonado». Measurements were carried out at room temperature.

Thermoelectromotive force was used as a sensitive parameter. Thermo-emf measurement let to identify conditions of new structural state formation in metals and alloys. Pressure dependences of thermo-emf of lead and relaxation processes at structural modifications were investigated under pressures 5-50 GPa.

According to previous investigations phase transitions in lead take place at 16, 20 and 63 GPa [1], and also some authors report about structural modifications of lead at higher pressures.

During measurements it was shown that lead thermo-emf changed inconvertible after loading. At the analysis of the time dependences of thermoelectromotive force of sample a number of features was revealed. Near 15, 30 and 45 GPa relaxation times change drastically. It may be connected with probable transitions at these pressures. But further work is necessary to corroborate this claim and to determine the nature of these changes.

This work was supported in part by grant BRHE EK-005-X1 (Ural research educational center "Advanced materials").

[1] C.A.Vanderborgh,Y.K.Vohra,H.Xia, and A.L.Ruoff, Phys. Rev. B 41, 7338-7340 (1990)

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