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Superparamagnetic-Like Behaviour in RE_2WO_6 Tungstates (Where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er)

100%

Groń T., Tomaszewicz E., Urbanowicz P., Duda H., Mydlarz T.

Acta Physica Polonica A

2011

vol. 119

issue 5

708-710

The magnetization isotherms were used to study the superparamagnetic-like behaviour in polycrystalline (powder) RE_2WO_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_{B} ≈ 30 K except the Sm_2WO_6 and Eu_2WO_6 compounds.

Electrical Properties of Sr₂InV₃O₁₁

86%

Groń T., Filipek E., Pacześna A., Urbanowicz P., Sawicki B., Duda H.

Acta Physica Polonica A

2016

vol. 130

issue 5

1239-1241

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.

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2 Acta Physica Polonica A

1 2016

1 2011

2 Duda H.

2 Groń T.

2 Urbanowicz P.

1 Filipek E.

1 Mydlarz T.

1 Pacześna A.

1 Sawicki B.

1 Tomaszewicz E.

Search results

Superparamagnetic-Like Behaviour in RE_2WO_6 Tungstates (Where RE = Nd, Sm, Eu, Gd, Dy, Ho and Er)

Electrical Properties of Sr₂InV₃O₁₁