Abstract
The transformation of dust structures under changes of discharge current in neon dc discharge at a pressure of 20 Pa and the discharge tube temperature of 77 K has been studied. A nonmonotonic dependence of radial and axial sizes of the dust formations on the discharge current have been detected and analyzed. It has been found that dust clouds consisted of a mixture of dust particles and clusters formed from dust particles. The first and second-order phase transitions in dust structures and the mesomorphic state of dusty plasma have been found. The transformation of the dust structure to spherical form has been detected.
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