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A.C. Susceptibility Measurements under High Pressure up to 2.0 GPa

100%

Średniawa B., Duraj R., Zach R., Guillot M.

A newly developed pressure setup for a.c. susceptibility measurements in the pressure range up to 2.0 GPa is presented; the temperature domain extends from 77 to 450 K. The steel pressure chamber contains the sample located at the center of a set of three compensated pick-up coils and the pressure and temperature sensors. Either alcohol or extraction naphtha is used as the liquid pressure transmitting medium. The (P,T) magnetic phase diagram of (Fe_{0.975}Ni_{0.025})_{2}P system in the pressure range up to 2.0 GPa is reported.

Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System

64%

Średniawa B., Duraj R., Pacyna A., Bombik A., Zach R., Bacmann M., Fruchart D., Nizioł S., Fornal P., Stanek J.

This report focuses on magnetoelastic properties and critical behaviour of (Fe_{1-x}Ni_{x})_{2}P system. For low Ni content (x=0.01) an isolated critical point was found. Analysis of this critical behaviour in the frame of molecular field approximation was carried out. Moreover, thermal variations of the lattice parameters, as measured by X-ray diffraction techniques, were studied. The (P,T) phase diagrams obtained for several Ni contents show the evidence that the Curie temperature decreases with pressure. The Mössbauer spectra collected for x = 0.025, 0.1, 0.2, 0.25 at different temperatures are also analysed. The existence of two nonequivalent crystallographic sites occupied by iron atoms as well as local magnetic structure is discussed.

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2 Acta Physica Polonica A

2 2000

2 Duraj R.

2 Zach R.

2 Średniawa B.

1 Bacmann M.

1 Bombik A.

1 Fornal P.

1 Fruchart D.

1 Guillot M.

1 Nizioł S.

1 Pacyna A.

1 Stanek J.

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A.C. Susceptibility Measurements under High Pressure up to 2.0 GPa

Magnetoelastic Phase Transitions and Critical Behaviour of (Fe_{1-x}Ni_{x})_{2}P System