Full-text resources of PSJD and other databases are now available in the new Library of Science.
Visit https://bibliotekanauki.pl
Preferences help
Polish version English version Language
enabled [disable] Abstract
Number of results

Results found: 5

Number of results on page
first rewind previous Page / 1 next fast forward last

Search results

help Sort By:

help Limit search:
first rewind previous Page / 1 next fast forward last
1
Publication available in full text mode
Content available

Single-domain nanoparticle magnetic power losses calibrated with calorimetric measurements

100%
Miaskowski A., Sawicki B., Subramanian M.
Bulletin of the Polish Academy of Sciences: Technical Sciences
|
2018
|
issue 4
2
Content available remote

Influence of Cr-Substitution on the Electrical Properties of Fe_{1-x}Cr_{x}SnSbO₆

88%
Groń T., Dąbrowska G., Filipek E., Duda H., Sawicki B.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 1a
A-153-A-156
EN
Fe_{1-x}Cr_xSnSbO₆ solid solution shows semiconducting behaviour with the activation energy decreasing from E_{A}=0.64 eV for x=0.0 to E_{A}=0.32 eV for x=1.0 in the intrinsic conductivity temperature region as well as the n-type conduction at room temperature. The I-V characteristics and the conductance G at 300 and 400 K showed symmetrical and nonlinear behavior in the voltage range (-100, 100 V) suggesting the electron emission over the potential barrier especially for the boundary compounds FeSnSbO₆ and CrSnSbO₆. These effects are discussed in the context of the energy gap E_{g}>1.6 eV many times greater than the thermal energy kT.
3
Content available remote

Electrical Transport Properties of Yb_{8-x}Y_xV_2O₁₇ (x=0,2,8)

88%
Sawicki B., Piz M., Filipek E., Groń T., Duda H.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 2
363-366
EN
The UV-vis-NIR and electrical properties of Yb_{8-x}Y_xV_2O₁₇ for x=0, 2, and 8 were investigated. The band energy gap of 2.6 eV determined for Yb_6Y_2V_2O₁₇ (x=2) and comparable for the remaining compounds with x=0 and 8 is characteristic for insulators. Low electrical conductivity with a characteristic minimum shifting to higher temperatures from 322, via 360 to 370 K in the sequence x=0, 2 and 8, which decreases with increasing content of ytterbium was observed. Temperature dependence of thermoelectric power showed n-p transition at 410 and 467 K for x=0 and 2, respectively, and n-type conductivity for x=8, indicating mainly n-type electrical conductivity. A breakdown voltage of 26 V/mm is mainly observed for the I-V characteristics at 400 K and showing a varistor-like behavior.
4
Content available remote

Electrical Properties of Sr₂InV₃O₁₁

76%
Groń T., Filipek E., Pacześna A., Urbanowicz P., Sawicki B., Duda H.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 5
1239-1241
EN
The electrical conductivity σ (T) and thermoelectric power S(T) measurements of Sr₂InV₃O₁₁ showed the insulating state and the change of sign of thermopower from p to n at T_{n-p}=400 K. The I-V characteristics provided the evidence of symmetrical and non-linear behaviour typical of strong emission of charge carriers induced by temperature and voltage. Relative dielectric permittivity ε_{r} as well as loss tangent (tan δ) strongly depend both on the temperature in the range of 295-400 K and the frequency in the range of 5×10² to 1×10⁶ Hz, showing the broad maximum at 320 K. These effects are considered as a relaxation process like in the Maxwell-Wagner or Jonscher model as well as the conduction of electric current, as determined by the Joule-Lenz law.
5
Content available remote

Correlation between the Band-Gap Energy and the Electrical Conductivity in MPr₂W₂O₁₀ Tungstates (Where M = Cd, Co, Mn)

76%
Sawicki B., Tomaszewicz E., Piątkowska M., Groń T., Duda H., Górny K.
Acta Physica Polonica A
|
2016
|
vol. 129
|
issue 1a
A-94-A-96
EN
The values of the direct allowed energy gap determined from the UV-vis-NIR measurements and Kubelka-Munk transformation decrease from 3.38 via 2.70 to 2.42 eV for MPr₂W₂O₁₀ in the sequence M = Cd, Co, Mn, while the values of the activation energy increase from 0.11 via 0.44 to 0.47 eV in the same sequence. In other words, the higher the activation energy, the smaller the energy gap. Because the energy gap is typical for insulators, so electron transport phenomena are considered under the Poole-Frenkel effect and small-polaron mechanism.
first rewind previous Page / 1 next fast forward last
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.