Temat: G20 - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Electrical Transport Properties of $Yb_{8-x}Y_xV_2O_{17}$ (x=0,2,8)
Autorzy:: Sawicki, B.
Piz, M.
Filipek, E.
Groń, T.
Duda, H.
Powiązania:: https://bibliotekanauki.pl/articles/1398346.pdf
Data publikacji:: 2017-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Pa
72.80.Ga
75.20.-g
Opis:: The UV-vis-NIR and electrical properties of $Yb_{8-x}Y_xV_2O_{17}$ for x=0, 2, and 8 were investigated. The band energy gap of 2.6 eV determined for $Yb_6Y_2V_2O_{17}$ (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.
Źródło:: Acta Physica Polonica A; 2017, 132, 2; 363-366
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Influence of Cr-Substitution on the Electrical Properties of $Fe_{1-x}Cr_xVSbO_6$
Autorzy:: Duda, H.
Filipek, E.
Dąbrowska, G.
Groń, T.
Mydlarz, T.
Powiązania:: https://bibliotekanauki.pl/articles/1399099.pdf
Data publikacji:: 2013-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Pa
72.80.Ga
75.20.-g
Opis:: $Fe_{1-x}Cr_xVSbO_6$ solid solution is semiconductor with the activation energy decreasing both in the intrinsic and extrinsic conductivity temperature regions as the Cr-content increases. The n-type conduction is observed for Fe-richer samples while a change of the Seebeck coefficient (from n to p) - for Cr-richer ones. Magnetic isotherms for all samples of solid solution under study are characteristic of the universal Brillouin function, indicating paramagnetic response. These effects are discussed within the framework of the appearance of the mixed valence of both Fe and Cr ions.
Źródło:: Acta Physica Polonica A; 2013, 124, 5; 833-835
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Influence of Cr-Substitution on the Electrical Properties of $Fe_{1-x}Cr_{x}SnSbO_6$
Autorzy:: Groń, T.
Dąbrowska, G.
Filipek, E.
Duda, H.
Sawicki, B.
Powiązania:: https://bibliotekanauki.pl/articles/1398554.pdf
Data publikacji:: 2016-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Pa
72.80.Ga
75.20.-g
Opis:: $Fe_{1-x}Cr_xSnSbO_6$ 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.
Źródło:: Acta Physica Polonica A; 2016, 129, 1a; A-153-A-156
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Electrical Properties of Sr₂InV₃O₁₁
Autorzy:: Groń, T.
Filipek, E.
Pacześna, A.
Urbanowicz, P.
Sawicki, B.
Duda, H.
Powiązania:: https://bibliotekanauki.pl/articles/1398582.pdf
Data publikacji:: 2016-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.20.Pa
72.80.Ga
75.20.-g
Opis:: 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.
Źródło:: Acta Physica Polonica A; 2016, 130, 5; 1239-1241
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Paramagnetism of Cu_3RE_2W_4O_{18} Semiconductors (RE = Gd, Dy-Er)
Autorzy:: Groń, T.
Tomaszewicz, E.
Duda, H.
Mazur, S.
Powiązania:: https://bibliotekanauki.pl/articles/1399149.pdf
Data publikacji:: 2013-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.50.Pp
75.20.-g
75.30.Cr
Opis:: $Cu_3RE_2W_4O_{18}$ tungstates (RE = Gd, Dy-Er) are paramagnets in the temperature range 4.2-300 K visible also in the absence of the energy losses in the curve of the imaginary part of magnetic susceptibility, χ". The negative values of the paramagnetic Curie-Weiss temperature, θ, may suggest the weak antiferromagnetic coupling below 4.2 K. The temperature independent component of magnetic susceptibility has a positive value indicating a domination of the Van Vleck contribution. Calculations of the effective number of the Bohr magnetons revealed that the orbital contribution to the magnetic moment comes mainly from the $RE^{3+}$ ions.
Źródło:: Acta Physica Polonica A; 2013, 124, 5; 885-887
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Superparamagnetic-Like Behaviour in RE$\text{}_{2}$WO$\text{}_{6}$ Tungstates (Where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er)
Autorzy:: Groń, T.
Tomaszewicz, E.
Urbanowicz, P.
Duda, H.
Mydlarz, T.
Powiązania:: https://bibliotekanauki.pl/articles/2048133.pdf
Data publikacji:: 2011-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 75.20.-g
75.25.Dk
75.30.Cr
73.61.Ng
Opis:: The magnetization isotherms were used to study the superparamagnetic-like behaviour in polycrystalline (powder) RE$\text{}_{2}$WO$\text{}_{6}$ tungstates (where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er). The magnetization isotherms of the majority tungstates under study revealed both the spontaneous magnetic moments and hysteresis characteristic for the superparamagnetic-like behaviour with blocking temperature T$\text{}_{B}$ ≈ 30 K except the Sm$\text{}_{2}$WO$\text{}_{6}$ and Eu$\text{}_{2}$WO$\text{}_{6}$ compounds.
Źródło:: Acta Physica Polonica A; 2011, 119, 5; 708-710
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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