TY - JOUR

T1 - Magnetic Properties of the Iron-Doped LiBa12(BO3)7F4 Fluoroborate (LBBF)

AU - Korotaev, E. V.

AU - Bekker, T. B.

AU - Davydov, A. V.

AU - Miroshnichenko, L. V.

AU - Fedorenko, A. D.

N1 - This study was funded by the Russian Science Foundation (project No. 24-19-00252, https://www.rscf.ru/project/24-19-00252/).

PY - 2025/8

Y1 - 2025/8

N2 - Magnetic properties of iron-doped LBBF samples are quite complex. Along with the paramagnetic component, magnetic susceptibility contains also the ferromagnetic contribution. The ratio of these components depends nonlinearly on the concentration of introduced iron, and so also do the effective magnetic moment of the iron ion and the Weiss constant that are determined by analysing the paramagnetic component of magnetic susceptibility. Changes in the magnetic properties of the studied compounds are accompanied by changes in the structure of 2p lines of X-ray photoelectron spectra of iron, whereas lines of other elements maintain their structure and energy positions. The main reasons of changes in magnetic properties with increasing iron concentration include changes in the space group in which the compounds crystallize, changes in the oxidation state of iron from 3+ to 2+, formation of superparamagnetic clusters, and isolation of an impurity phase for iron concentrations higher than 0.3 wt.%. Compounds with iron concentrations below 0.3 wt.%, crystallizing in the Pbam space group, exhibit more interesting properties. They are characterized by a larger ferromagnetic contribution and a larger effective magnetic moment of the paramagnetic center compared with the samples containing from 0.3 wt.% to 1 wt.% of iron and crystallizing in the P42bc space group, similarly to the initial LBBF.

AB - Magnetic properties of iron-doped LBBF samples are quite complex. Along with the paramagnetic component, magnetic susceptibility contains also the ferromagnetic contribution. The ratio of these components depends nonlinearly on the concentration of introduced iron, and so also do the effective magnetic moment of the iron ion and the Weiss constant that are determined by analysing the paramagnetic component of magnetic susceptibility. Changes in the magnetic properties of the studied compounds are accompanied by changes in the structure of 2p lines of X-ray photoelectron spectra of iron, whereas lines of other elements maintain their structure and energy positions. The main reasons of changes in magnetic properties with increasing iron concentration include changes in the space group in which the compounds crystallize, changes in the oxidation state of iron from 3+ to 2+, formation of superparamagnetic clusters, and isolation of an impurity phase for iron concentrations higher than 0.3 wt.%. Compounds with iron concentrations below 0.3 wt.%, crystallizing in the Pbam space group, exhibit more interesting properties. They are characterized by a larger ferromagnetic contribution and a larger effective magnetic moment of the paramagnetic center compared with the samples containing from 0.3 wt.% to 1 wt.% of iron and crystallizing in the P42bc space group, similarly to the initial LBBF.

KW - Faraday method

KW - Fe ions

KW - LiBa12(BO3)7F4 fluoroborate

KW - XPS

KW - specific magnetic susceptibility

KW - static magnetochemistry

KW - ФТОРИДОБОРАТ LIBA12(BO3)7F4

KW - ИОНЫ FE

KW - МЕТОД ФАРАДЕЯ

KW - УДЕЛЬНАЯ МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ

KW - СТАТИЧЕСКАЯ МАГНЕТОХИМИЯ

KW - РФЭС

UR - https://www.scopus.com/pages/publications/105014893447

UR - https://www.mendeley.com/catalogue/d699f01a-7379-3abe-b0cd-cbf0ce5e0900/

UR - https://www.elibrary.ru/item.asp?id=82786952

U2 - 10.1134/S0022476625080190

DO - 10.1134/S0022476625080190

M3 - Article

VL - 66

SP - 1743

EP - 1765

JO - Journal of Structural Chemistry

JF - Journal of Structural Chemistry

SN - 0022-4766

IS - 8

M1 - 19

ER -