Transport and semiconducting behavior of Ca2BiNbO6new inorganic double perovskite

Investigation of the structural, dielectric, magnetic properties and NTC-thermistor response of CaBiFeMnO6 double perovskites

“…Three polarisation factors-grain-grain polarisation, grain boundary polarisation, and electrode polarization-observed at various frequency ranges mediate the semi-circular curves of the complex impedance spectra. [43][44][45][46] The frequency varying impedance's real component (Z 0 ) and imaginary part (Z 00 ) may be written as…”

“…where t is the relaxation time, which includes the measured resistance (R) and capacitance (C) as t = RC, and o is the angular frequency. 44 The frequency-dependent impedance is plotted for various temperatures as seen in Fig. 7(a) and (b).…”

“…Three polarisation factors—grain–grain polarisation, grain boundary polarisation, and electrode polarization—observed at various frequency ranges mediate the semi-circular curves of the complex impedance spectra. 43–46 The frequency varying impedance's real component ( Z ′) and imaginary part ( Z ′′) may be written aswhere τ is the relaxation time, which includes the measured resistance ( R ) and capacitance ( C ) as τ = RC , and ω is the angular frequency. 44 The frequency-dependent impedance is plotted for various temperatures as seen in Fig.…”

“…43–46 The frequency varying impedance's real component ( Z ′) and imaginary part ( Z ′′) may be written aswhere τ is the relaxation time, which includes the measured resistance ( R ) and capacitance ( C ) as τ = RC , and ω is the angular frequency. 44 The frequency-dependent impedance is plotted for various temperatures as seen in Fig. 7(a) and (b).…”

Progress on lanthanide sesquioxide phase transition

“…Just focusing on inorganic ionic crystals (with inorganic oxides as main category), the solid-solid transitions take place between two different crystalline forms of a unique compound and, from the thermodynamic standpoint, solid-solid phase transitions are associated with their single robust transition temperature: T0, at which both the crystalline forms coexist in equilibrium [2]. Whether 1 st order or 2 nd order, or with a displacive or order-disorder mechanism, the reversible solid-solid phase transitions are the most studied ; reversible phase transitions can imply besides the structural transformation some huge changes in terms of magnetic [3], optical [4], transport (ionic, electronic) [5] or catalytic properties [6]. Reversible phase transition can thus be used in smart/active materials, as for example the metal-insulator phase transition of vanadium dioxide, which is accompanied by a radical change of its transparency in the infrared, is extensively studied for smart window applications [7][8][9][10][11].…”