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3 Acta Physica Polonica A

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Equation of State of Zircon-Type TbVO_{4}

100%

Minikayev R. , Paszkowicz W. , Werner-Malento E. , Lathe C. , Dąbkowska H.

Acta Physica Polonica A

2010

tom 117

nr 2

319-322

High-pressure energy-dispersive X-ray diffraction study were performed on zircon-type phase of terbium orthovanadate, TbVO_{4}, in the pressure range up to 7 GPa. For analysis of the collected diffraction spectra, Le Bail refinements were performed. The values of bulk modulus and its pressure derivative (B_0 = 121 GPa, B' = 4.1) were obtained from fitting of the second-order Birch-Murnaghan equation of state. The equation of state derived for TbVO_{4}, is compared with earlier data based on the Raman spectroscopic studies and with data of several other rare-earth orthovanadates.

Isobaric Thermal Expansion and Isothermal Compression of Powdered NiFe Based Alloys Studied by In-Situ EDXRD

100%

Olekšáková D. , Füzer J. , Kollár P. , Bednarčík J. , Lathe C.

Acta Physica Polonica A

2014

tom 126

nr 1

128-129

The aim of the present work was to study the isothermal compression and isobaric thermal expansion behaviour of ball-milled NiFe (81 wt.% of Ni) and NiFeMo (79 wt.% of Ni, 16 wt.% of Fe) alloy and follow its phase evolution when exposed to high pressure and temperature. In-situ pressure-temperature energy dispersive X-ray (EDXRD) diffraction experiments were performed at the MAX80 instrument (beamline F2.1). The compressibility of NiFe alloy at 400 °C was evaluated for pressure values of up to 3.5 GPa. The EDXRD spectra revealed the presence of cubic FeNi_{3} phase as determined from the shift of (111), (200) and (220) reflection lines in corresponding EDXRD spectra.

In Situ Energy Dispersive X-Ray Diffraction Analysis of the Temperature-Pressure Stability of Co-Fe-(Ta,W)-B Alloys

86%

Kanász R. , Bednarčík J. , Saksl K. , Nicula R. , Stir M. , Lathe C.

Acta Physica Polonica A

2008

tom 113

nr 1

79-82

In this work two Co_{53.5}Fe_{10}X_{5.5}B_{31} (X = Ta, W) alloys were synthesized from high purity (≥99.9%) powder elements by means of mechanical alloying. In case of Ta-addition, mechanical alloying resulted in formation of two component material with nanocrystalline phase embedded in amorphous matrix. On the other hand, substitution of Ta by W retards partial amorphization induced by mechanical alloying. High pressure-temperature stability of both alloys was monitored using in situ energy dispersive X-rays.