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Dielectric Properties of K_{1-x}(NH_4)_xH_2PO_4 (x= 0.095) Crystal

100%

Kaszyński J., Trybuła Z., Małuszyńska H.

Acta Physica Polonica A

2005

vol. 108

issue 1

103-106

Temperature dependences of the dielectric permittivity were studied for the ferroelectric K_{1-x}(NH_4)_xH_2PO_4 mixed crystal. The experiments revealed presence of the beginning of the dipolar glass - embryos in the concentration of ammonium x=0.095. Observations of the dielectric relaxations show much bigger effect domain mechanism than the one related to the growth of clusters of the dipolar glass.

Superconducting Regions and Kondo Effect of MgB_2 Formed by Implantation of Magnesium Ions into Boron Substrate

64%

Trybuła Z., Kempiński W., Andrzejewski B., Piekara-Sady L., Kaszyński J., Trybuła M., Piekoszewski J., Stanisławski J., Barlak M., Richter E.

Acta Physica Polonica A

2006

vol. 109

issue 4-5

657-660

The results of investigation of the polycrystalline boron implanted by magnesium and argon plasma pulse treatment are presented. The four-probe electric conductivity measurements and magnetically modulated microwave absorption showed the presence of superconducting islands below the temperature of 25 K. Below T=23 K we detected the Kondo effect, a logarithmic increase in the resistivity as the temperature is lowered, due to iron impurity.

Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate

52%

Trybuła Z., Kempiński W., Andrzejewski B., Piekara-Sady L., Kaszyński J., Piekoszewski J., Werner Z., Richter E., Prokert F., Stanisławski J., Barlak M.

Acta Physica Polonica A

2005

vol. 108

issue 1

165-170

The results of investigation of the MgB_2 inter-metallic compound with the use of boron ions implantation and plasma pulse treatment are presented. The samples were characterized by: four-probe electric conductivity measurements, magnetically modulated microwave absorption, and magnetic measurements. For hydrogen and argon pulsed plasma treatment the samples with T_c ranging from 10 K to 32 K were obtained. The superconducting phase does not form a continuous layer since the resistivity does not fall down to zero. Apparently, separate islands of superconducting phase are connected through metallic Mg paths. All samples are still below the percolation threshold.

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3 Acta Physica Polonica A

1 2006

2 2005

3 Kaszyński J.

3 Trybuła Z.

2 Andrzejewski B.

2 Barlak M.

2 Kempiński W.

2 Piekara-Sady L.

2 Piekoszewski J.

2 Richter E.

2 Stanisławski J.

1 Małuszyńska H.

1 Prokert F.

1 Trybuła M.

1 Werner Z.

Search results

Dielectric Properties of K_{1-x}(NH_4)_xH_2PO_4 (x= 0.095) Crystal

Superconducting Regions and Kondo Effect of MgB_2 Formed by Implantation of Magnesium Ions into Boron Substrate

Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate