The interest to study of physical properties of sulfur under high
pressure is connected with the fact that it has very complex phase
diagram. At high pressures metallization and superconduction
transitions have found out in sulfur.
The purpose of our investigations is to study the electrophysical
properties (resistance, inductivity and loss angle) of sulfur in a
frequency range 0.1-100 kHz at high pressures from 20 to 50 GPa and
room temperature.
The high pressures have been genereted in a diamond anvil cell (DAC)
with anvils of the "rounded cone - plane" (Verechagin-Yakovlev type)
made of synthetic polycrystalline "carbonado" diamond. For
measurements sulfur powders of orthorhomdic structure with a purity of
99.99 % were used.
As is known, at study of dielectric properties of materials on an
alternating current rather simply to receive the information on
presence of relaxation processes resulting to additional absorption of
energy of an electromagnetic field. These processes can be connected
to structural reorientation dipoles in investigated object and change
its electronic and the ionic characteristics.
On frequency dependencies of a loss tangent at different pressures
have been founded out that at frequencies above 10 kHz a frequency
dependence is approximate a direct with an inclination (- 0,70 ą
0,01), i. e. peculiarities in the dielectric characteristics of sulfur
is not observed. At frequencies below 10 kHz on the frequency
dependence two intervals are emphasized in which dielectric loss have
peculiarities. Almost ten times they grow in an interval of
frequencies 0,4-0,8 kHz, more than twice at frequencies 3-10 kHz. With
increasing pressure, the time of relaxation and the absorbed energy in
a frequency range 3-10 kHz decreasing. At the same time behavior of
the analogous characteristics in a frequency range 0,4-0,8 kHz is
complex.
The observable peculiarities in dielectric losses can be connected to
known phase transition in sulfur. Namely in the given pressure range
pressure-induced amorphization is observed. It is possible that the
dielectric peculiarities of processes at high pressures in sulfur are
connected with a disorder of crystal structure and a formation of
electrical active complexes, resonantly absorbing energy of an
electromagnetic field.

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Ekaterinburg, 620219

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1. Electrical Characteristics of Dielectrics and Semiconductors at High Pressures in Diamond Anvil Cell