Electrical transport properties of CoMn0.2−xGaxFe1.8O4 ferrites using complex impedance spectroscopy

AbstractThe temperature (T) and pressure (P) dependence of dielectric and conductivity properties of natural leucite were determined using complex impedance spectroscopy at frequencies from 103 to 106 Hz. Experiments were carried out in a Walker multi-anvil cell at 1 atm and P from 2.5 to 6 GPa and at T from 350 to 800°C. At pressure >6 GPa and temperature >790°C the leucite broke down to kalsilite+sanidine and dielectric properties for this phase assemblage are given at 6.0–7.0 GPa and T to 1050°C.Leucite conductivity increases with increasing T and decreases with increasing P reflecting their different effects on migration of K cations within the channels in the leucite aluminosilicate framework. Activation energies for K+ migration in leucite increase with increasing pressure (0.74–0.97 eV; 70.0–93.2 kJ/mol) and activation volumes for leucite increase with increasing T (6.42–9.51 cm3/mol; 400–700°C). The latter data provide model K+ cation diameters increasing from 2.7 Å at 400°C to 3.2 Å at 700°C. These values are consistent with the earlier suggestion of Palmer and Salje that the ionic mobility mechanism consists of diffusion along <110> rather than along the main channels parallel to <111>.

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Electric transport properties study of bulk BaFe12O19 by complex impedance spectroscopy

Physica B Condensed Matter ◽

10.1016/j.physb.2015.06.006 ◽

2015 ◽

Vol 474 ◽

pp. 57-63 ◽

Cited By ~ 46

Author(s):

R. Pattanayak ◽

S. Panigrahi ◽

T. Dash ◽

R. Muduli ◽

D. Behera

Keyword(s):

Impedance Spectroscopy ◽

Transport Properties ◽

Complex Impedance ◽

Complex Impedance Spectroscopy ◽

Electric Transport

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Dielectric, Complex Impedance, and Electrical Transport Properties of Erbium (Er3+) Ion-Substituted Nanocrystalline, Cobalt-Rich Ferrite (Co1.1Fe1.9–xErxO4)

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.5b11188 ◽

2016 ◽

Vol 120 (10) ◽

pp. 5682-5693 ◽

Cited By ~ 71

Author(s):

Sandip G. Kakade ◽

Yuan-Ron Ma ◽

Rupesh S. Devan ◽

Yesh D. Kolekar ◽

C. V. Ramana

Keyword(s):

Transport Properties ◽

Electrical Transport ◽

Complex Impedance ◽

Electrical Transport Properties

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Electrical transport in Sr(NO3)2: comparative study by d.c. and complex-impedance spectroscopy methods on single crystals and pressed pellets

Journal of Materials Science Letters ◽

10.1007/bf00729899 ◽

1992 ◽

Vol 11 (14) ◽

pp. 980-981 ◽

Cited By ~ 2

Author(s):

S. Narender Reddy ◽

A. Sadananda Chary ◽

T. Chiranjivi

Keyword(s):

Impedance Spectroscopy ◽

Comparative Study ◽

Single Crystals ◽

Electrical Transport ◽

Complex Impedance ◽

Complex Impedance Spectroscopy

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Study of Electrical Transport Properties of Thin Films Used as HTL and as Active Layer in Organic Solar Cells, through Impedance Spectroscopy Measurements

Advances in Materials Science and Engineering ◽

10.1155/2016/7267634 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Camilo A. Otalora ◽

Andres F. Loaiza ◽

Gerardo Gordillo

Keyword(s):

Thin Films ◽

Solar Cells ◽

Impedance Spectroscopy ◽

Transport Properties ◽

Active Layer ◽

Organic Solar Cells ◽

Electrical Transport ◽

Hole Transport ◽

Transport Layer ◽

Electrical Transport Properties

Impedance spectroscopy (IS) is used for studying the electrical transport properties of thin films used in organic solar cells with structure ITO/HTL/active layer/cathode, where PEDOT:PSS (poly(3,4-ethylenedioxythiophene):polystyrene sulfonic acid) and CuPC (tetrasulfonated copper-phthalocyanine) were investigated as HTL (hole transport layer) and P3HT:PCBM (poly-3-hexylthiophene:phenyl-C61-butyric acid methyl ester) blends prepared from mesitylene and chlorobenzene based solutions were studied as active layer and Ag and Al were used as cathode. The study allowed determining the influence of the type of solvent used for the preparation of the active layer as well as the speed at which the solvents are removed on the carriers mobility. The effect of exposing the layer of P3HT to the air on its mobility was also studied. It was established that samples of P3HT and P3HT:PCBM prepared using mesitylene as a solvent have mobility values significantly higher than those prepared from chlorobenzene which is the solvent most frequently used. It was also determined that the mobility of carriers in P3HT films strongly decreases when this sample is exposed to air. In addition, it was found that the electrical properties of P3HT:PCBM thin films can be improved by removing the solvent slowly which is achieved by increasing the pressure inside the system of spin-coating during the film growth.

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