Anomalies of Physical Properties in?-Bi2O3 ? a Phase Transition Governed by the Electronic Mechanism?статья
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Дата последнего поиска статьи во внешних источниках: 9 апреля 2021 г.
Аннотация:A number of physical properties of α-Bi2O3 was studied: the thermal expansion, thermally stimulated conductivity, electrical resistivity, and dielectric permeability. X-ray diffraction, DTA, and differential scanning calorimetry measurements were also carried out. Several anomalies were observed: a small maximum and drastic rise of the single crystal dielectric permeability, a sharp drop of the electric resistivity, a jump and change in sign of the thermally stimulated current, and an exothermal maximum in differential heat capacity. At the same time, the monoclinic lattice symmetry of α-Bi2O3 was retained over the temperature range where these anomalies were found.