Bi 4 Ge 3 O 12 (bismuth germanate – BGO) single crystals were produced by the Czochralski technique and their electrical and dielectric properties were investigated by impedance spectroscopy. The isothermal ac measurements were performed for temperatures from room temperature up to 750 °C, but only the data taken above 500 °C presented a complete semicircle in the complex impedance diagrams. Ex...

The development of new electrical energy storage devices and the improving of existing ones e.g. batteries and supercapacitors (SC) has become extremely important due to increased application of these devices in transportation and in renewable energy storage. Among them, SC are more capable of generating higher power density than are batteries, and are gaining particular interest. They are used...

Using the same colour scheme as the flow diagram above, Figure 2 shows how this conceptual framework applies for DC methods. The energy source is a pair of electrodes that inject a well-known current into the ground at known locations (Fig. 2a). The earth affects this energy because variations in the electrical conductivity of subsurface structures will bend the current flow lines (Fig. 2b). Th...

We report measurements of electrical conductivity of eight metals in the plasma state at densities ranging from 0.002 to 0.5 times solid density, and with internal energy from 2 to 30 kJ/gm. Data are presented as functions of internal energy and specific volume. Conductivity is observed to fall as the plasma expands for fixed internal energy, and for all but tantalum and titanium shows a minimu...

in this study we investigate the effect of atoms such as b, n, ge and sn on the optical and the electrical properties of capped (5, 0) zigzag carbon nanotube, using dft calculation method. these elements were attached to the one end of the carbon nanotube. we considered four different structure designs as possible candidates for a p-n junction device. the electrical properties of these structur...

The compounds, lanthanium chromite, lanthanium magnetite and lanthanium ferric oxide were prepared through sol-gel methods in powdered form, then calcinated, peletized, and sintered at various temperatures. Electrical conductivity of these compounds was measured at various temperatures. The effectiveness of strontium as a dopant on electrical conductivity was also investigated. Electrical condu...

Staphylotoxin channel appears to be predominantly anion-selective with non-linear and asymmetric current-voltage characteristics (CVC) at neutral pH. Increased salt concentrations induce linearity and asymmetry of CVC and loss of selectivity. At lower pH both the channel conductivity and anion selectivity increase. Higher temperatures raise the channel conductivity in parallel with the changes ...

Supercapacitors, also called ultracapacitors or electrochemical capacitors, store electrical charge on high-surface-area conducting materials. Their widespread use is limited by their low energy storage density and relatively high effective series resistance. Using chemical activation of exfoliated graphite oxide, we synthesized a porous carbon with a Brunauer-Emmett-Teller surface area of up t...

A set of borophosphate glasses doped with alkali and transition metal (TM) ions have been synthesized. The were carried through; annealing, XRD, density, DC conductivity studies. Molar volume density varied nonlinearly. High temperature activation energy is analysed taking into consideration Mott’s SPH model. low electrical was by Mott Greaves VRH. Several polaron hopping related parameters at ...

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