Small-polaron excitations inBa1−xKxBiO3studied by optical reflectivity measurements

Lithium rich phosphate glass: Crystallization kinetics, structural and conduction characteristics

“…We did not observe any temperature dependence for the parameters p, r and s as evident from the above tables. However, the characteristic relaxation frequency ω c gives a good estimate of the hoping frequency [41] and shows Arrhenian temperature dependence.…”

Optical phonons in new ordered perovskite Sr2Cu(Re0.69Ca0.31) Oy system observed by infrared reflectance spectroscopy

“…In this way, we could determine accurately the optical dielectric constant, ε (ω), by applying KK transformation to the reflectivity spectra for such a broad frequency range. Further detail of the experimental set up and reflectivity measurements can be seen elsewhere [5][6][7].…”

Hydrothermal synthesis of superconductors Ba1−xKxBiO3 and double perovskites Ba1−xKxBi1−yNayO3

“…In recent years, many efforts have been devoted to explore new superconducting materials and improving the preparation methods of existent superconductors [1][2][3][4]. As the first copper-free oxide superconductor with the transition temperature as high as 30 K, the Ba 1−x K x BiO 3 system has triggered extensive research in recent decades [5][6][7][8][9][10]. However, the synthesis routes of these oxides are not so convenient due to their poor thermal stability.…”