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Sökning: WFRF:(Bush A.) > Kungliga Tekniska Högskolan

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  • Serovaiskii, A. Y., et al. (författare)
  • Investigation of the LiCu2O2 Phase Samples Treated under High Thermobaric Conditions
  • 2021
  • Ingår i: Crystallography reports (Print). - : Pleiades Publishing Ltd. - 1063-7745 .- 1562-689X. ; 66:6, s. 1060-1065
  • Tidskriftsartikel (refereegranskat)abstract
    • Orthorhombic lithium cuprate LiCu2O2 was exposed to high temperature and pressure of 950 degrees C and 4.5 GPa. X-ray diffraction studies indicate that the treated samples of LiCu2O2 had tetragonal symmetry, in contrast to the orthorhombic one of the phase synthesized at atmospheric pressure. Temperature dependences of dielectric permittivity epsilon and tangent of dielectric loss tan delta, as well as DC (direct current), resistivity, rho were investigated in the temperature range 77-296 K. No anomalous changes of the studied parameters inherent in the phase transitions were detected in this temperature range. The rho(T) dependences were common to semiconductors. These dependences were linearized in the Mott coordinates log rho-1/T (0.25). It indicated the variable length hopping mechanism of conduction between the next nearest neighbors in the studied samples.
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  • Serovaiskii, Alexandr, et al. (författare)
  • Synthesis of Perovskite-Type BiScO3 Ceramics and their Dielectric and Infrared Characterization
  • 2022
  • Ingår i: Journal of Physical Chemistry Letters. - : American Chemical Society (ACS). - 1948-7185 .- 1948-7185. ; 13:43, s. 10114-10119
  • Tidskriftsartikel (refereegranskat)abstract
    • BiScO3 compound was obtained in the form of dense ceramic with a perovskite-type structure, and its complex characterization was determined for the first time. The corresponding synthesis procedure is described in detail. It is demonstrated that the temperature region of the phase stability at atmospheric pressure lies at T < 700 degrees C (973 K). It is shown that the crystal structure of the BiScO3 ceramic is centrosymmetric. Dielectric measurements of the synthesized sample performed at frequencies 25 Hz to 1 MHz and at temperatures 10-340 K show no changes typical for phase transition. Room-temperature infrared (30-15600 cm(-1)) and Raman (90-2000 cm(-1)) spectra of the prepared BiScO3 ceramic are measured, and information on the parameters of phonon resonances is obtained. The number of infrared modes exceeds that predicted by the factor group analysis of the noncentrosymmetric space group C2. The reason for selection rules violation can be associated with the disorder of the crystal structure and local distortions induced by the lone pair of electrons of Bi3+.
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  • Resultat 1-4 av 4

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