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1

Magnetic Structures of Ho_5Rh_4Ge_{10}

100%

Szytuła A., Penc B., Hofmann M., Sikora W.

Acta Physica Polonica A

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2013

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vol. 124

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issue 6

1002-1004

EN

A powder diffraction measurement of Ho_5Rh_4Ge_{10} is reported. This compound crystallizes in the tetragonal Sc_5Co_4Si_{10}-type structure (space group P4/mbm) in which the Ho atoms occupy three different sites. The neutron diffraction measurements indicate antiferromagnetic order with the Néel temperature T_{N}=7 K. Below T_{N} an additional phase transition at 4.5 K connected with the change of the magnetic structure is observed. The Ho moments in 4(h) site form collinear order up to T_{N} while moments at 2(a) site form sine modulated structure. Determined experimentally magnetic structures are compared to the results of symmetry analysis.

2

Magnetic Behaviour and Electronic Structure of the R_{2}PdSi_{3} (R = Ce, Nd, Tb-Er) Compounds

76%

Szytuła A., Hofmann M., Penc B., Ślaski M., Majumdar S., Sampathkumaran E., Zygmunt A.

Acta Physica Polonica A

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2000

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vol. 97

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issue 5

823-826

EN

The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R_{2} PdSi_{3} (R = Ce, Nd, Tb-Er). In Ce_{2}PdSi_{3} the Ce moments order below 2.5 K. The Nd magnetic moments in Nd_{2}PdSi_{3} exhibit ferromagnetic ordering below 17 K. In Tb_{2}PdSi_{3}, a complex situation is observed: in the temperature range from 1.5 K to (T_{N}=25 K), there is a coexistence of a ferromagnetic spiral (about 75% of the magnetic moment) and a spin-glass (about 25%). For the Dy, Ho, and Er compounds, below T_{N} (7.5, 8, and 7 K respectively), sinusoidally modulated structures are observed. The valence band and the core level photoemissions of 4d of rare-earth metal, 3d Pd, 2s and 2p Si were investigated by X-ray photoemission spectroscopy measurements.

3

Magnetic Properties of RRhGe (R = Dy and Tm) Compounds

76%

Bażela W., Hofmann M., Baran S., Penc B., Szytuła A., Zygmunt A.

Acta Physica Polonica A

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2000

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vol. 97

|

issue 5

819-822

EN

The magnetic properties of the ternary intermetallic RRhGe (R = Dy and Tm) were investigated by magnetic and neutron diffraction measurements. These compounds crystallize in a TiNiSi-type orthorhombic structure and are antiferromagnets with the Néel temperature 20 K (R = Dy) and 6.2 K (R = Tm). The neutron diffraction data reveal that the magnetic order in TmRhGe is collinear with the magnetic unit doubled along the b-axis respective to the crystal one.

4

In Situ Neutron Diffraction Characterization of Phases in Co-Re-Based Alloys at High Temperatures

64%

Strunz P., Mukherji D., Gilles R., Gasser U., Beran P., Farkas G., Hofmann M., Karge L., Rösler J.

Acta Physica Polonica A

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2015

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vol. 128

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issue 4

684-688

EN

Co-Re-based alloys strengthened by carbides are promising candidates for new high-temperature alloys for gas turbine applications. The high temperature microstructure and its stability are of utmost importance, e.g. due to strengthening-phase selection. Neutron scattering, providing in situ information at high temperatures, was extensively used in the past for the Co-Re alloys research. The paper focuses on TaC strengthened alloy, particularly on the stability TaC precipitates which were previously shown not to dissolve up to at least 1300°C. Small-angle neutron scattering shows that its finer morphological variant - most suitable for high temperature strengthening - coarsened even at relatively low temperature of 1000°C. This coarsening is faster at higher temperatures and the mean size exceeded 1000 Å (i.e. the size - detection limit of the used facility) after 4 h hold at 1200°C.

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Magnetic Structures of Ho_5Rh_4Ge_{10}

Magnetic Behaviour and Electronic Structure of the R_{2}PdSi_{3} (R = Ce, Nd, Tb-Er) Compounds

Magnetic Properties of RRhGe (R = Dy and Tm) Compounds

In Situ Neutron Diffraction Characterization of Phases in Co-Re-Based Alloys at High Temperatures