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DSC Studies of Some Bismuth-phosphate Glasses

100%

El-Adawy A.

Acta Physica Polonica A

1998

vol. 94

issue 4

661-670

The differential scanning calorimetry measurements were made on a series of bismuth-iron-phosphate glasses over a temperature range around the glass transition temperature. The activation energy for structural relaxation, ΔH, was determined and found to increase with the metal-to-phosphorus ratio. The differential scanning calorimetry data were analyzed using the Adam-Gibbs-Scherer model of the glass transition. This analysis suggests that these glasses undergo a transition from the strong to the fragile glass regime as the metal-to-phosphorus ratio is increased.

Heat Capacity and Elastic Constants of Fe_{3-x}Zn_{x}O_{4} in the Vicinity of the Verwey Transition

51%

Kozłowski A., Kąkol Z., Schwenk H., Bareiter S., Hinkel C., Luthi B., Honig J.

Acta Physica Polonica A

2000

vol. 97

issue 5

883-887

The results of the heat capacity and elastic constant studies of Fe_{3-x}Zn_{x}O_{4} (x<0.04) series are reported. Adiabatic heat capacity measurements, performed on single crystals, show the clear change of the transition character from first order for low Zn content (x<0.012) to the higher order in 0.012

Magnetic phases in UNi2Si2

38%

Svoboda P., Javorský P., Honda F., Sechovský V., Menovsky A.

Open Physics

2004

vol. 2

issue 2

397-418

The tetragonal compound UNi2Si2 exhibits in zero magnetic field three different antiferromagnetic phases belowT N=124 K. They are formed by ferromagnetic basal planes, which are antiferromagnetically coupled along thec-axis with the propagation vectorq=(0, 0, q z). Two additional order-order magnetic phase transitions are observed below T N, namely atT 1=108 K and T 2=40 K in zero magnetic field. All three phases exhibit strong uniaxial anisotropy confining the U moments to a direction parallel to the c-axis. UNi2Si2 single crystals were studied in detail by measuring bulk thermodynamic properties, such as thermal expansion, resistivity, susceptibility, and specific heat. A microscopic study using neutron diffraction was performed in magnetic fields up to 14.5 T parallel to the c-axis, and a complex magnetic phase diagram has been determined. Here, we present the analysis of specific-heat data measured in magnetic fields up to 14 T compared with the results of the neutron-diffraction study and with other thermodynamic properties of UNi2Si2.

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2 Acta Physica Polonica A

1 Open Physics

1 2004

1 2000

1 1998

1 Bareiter S.

1 El-Adawy A.

1 Hinkel C.

1 Honda F.

1 Honig J.

1 Javorský P.

1 Kozłowski A.

1 Kąkol Z.

1 Luthi B.

1 Menovsky A.

1 Schwenk H.

1 Sechovský V.

1 Svoboda P.

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DSC Studies of Some Bismuth-phosphate Glasses

Heat Capacity and Elastic Constants of Fe_{3-x}Zn_{x}O_{4} in the Vicinity of the Verwey Transition

Magnetic phases in UNi2Si2