4 research outputs found
Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study
Π’Π΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ Π½Π΅ ΠΏΡΠ±Π»ΠΈΠΊΡΠ΅ΡΡΡ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π΄ΠΎΡΡΡΠΏΠ΅ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΎΠΉ ΠΆΡΡΠ½Π°Π»Π°.We report on the thermodynamic, magnetic properties and the magnetic structure of
ludwigite-type Cu2MnBO5. The specific heat, low-field magnetization and paramagnetic
susceptibility were studied on a single crystal and combined with powder neutron diffraction
data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal
a single magnetic phase transition at T = 92 K, which corresponds to the magnetic ordering
into a ferrimagnetic phase. The cation distribution and the values and directions of magnetic
moments of ions in different crystallographic sites are established. The magnetic moments
of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are
pairwise antiparallel and their directions do not coincide with the directions of the principal
crystallographic axes. The small value of the magnetic moment of copper ions occupying site
2a is indicative of partial disordering of the magnetic moments on this site. The magnetization
measurements show a strong temperature hysteresis of magnetization, which evidences for
field-dependent transitions below the phase transition temperature
Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study
Π’Π΅ΠΊΡΡ ΡΡΠ°ΡΡΠΈ Π½Π΅ ΠΏΡΠ±Π»ΠΈΠΊΡΠ΅ΡΡΡ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π΄ΠΎΡΡΡΠΏΠ΅ Π² ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΠΈΠΈ Ρ ΠΏΠΎΠ»ΠΈΡΠΈΠΊΠΎΠΉ ΠΆΡΡΠ½Π°Π»Π°.We report on the thermodynamic, magnetic properties and the magnetic structure of
ludwigite-type Cu2MnBO5. The specific heat, low-field magnetization and paramagnetic
susceptibility were studied on a single crystal and combined with powder neutron diffraction
data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal
a single magnetic phase transition at T = 92 K, which corresponds to the magnetic ordering
into a ferrimagnetic phase. The cation distribution and the values and directions of magnetic
moments of ions in different crystallographic sites are established. The magnetic moments
of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are
pairwise antiparallel and their directions do not coincide with the directions of the principal
crystallographic axes. The small value of the magnetic moment of copper ions occupying site
2a is indicative of partial disordering of the magnetic moments on this site. The magnetization
measurements show a strong temperature hysteresis of magnetization, which evidences for
field-dependent transitions below the phase transition temperature
Occurrences of Threatened Species included in the Third Edition of the Red Data Book of the Komi Republic (Russia)
The purpose of the data paper was to introduce into scientific literature the results of scientific work carried out for the third edition of the 'Red Data Book of the Komi Republic'. The article reflects methodological approaches to the formation of a list of rare and in need of protection species and describes the corresponding datasets published in GBIF.Information about 7,187 occurrences of 438 rare species and infraspecies included in the third edition of the 'Red Data Book of the Komi Republic' have been published