This letter provides a brief overview of scientific articles published in the Magnetic Resonance in Solids. Electronic Journal (MRSej) during 2025 (Volume 27, Issues 1-3). Fifteen research papers appeared in the volume, distributed over three issues and covering electron paramagnetic resonance of point defects in low-dimensional solids, spectroscopy and crystal-field theory of rare-earth ions, the magnetism of complex and high-entropy oxides, nuclear magnetic resonance of porous media, and the computational and instrumental underpinnings of magnetic resonance. Rather than cataloguing individual results, the present letter attempts to trace the internal coherence of the volume and to indicate the directions in which the journal’s traditional themes have developed over the past year.
The orientation and frequency-field dependencies of continuous wave electron paramagnetic resonance (EPR) spectra were measured for the first time for impurity Ho 3+ ions in yttrium orthosilicate single crystal in the frequency range of 140 - 200GHz. The value of the zero field splitting of electron-nuclear levels and the magnetic characteristics of Ho 3+ ions substituting yttrium in the Y2 crystallographic sites are determined.
The effect of the hydrothermal treatment temperature of a colloidal solution of LaF 3 nanoparticles in an autoclave (60–140 ◦ C) on the particle size, the size of the coherent scattering region, and the concentration of paramagnetic centers has been studied. The samples were characterized using X-ray diffraction, transmission electron microscopy and magnetic resonance methods. The optimal hydrothermal treatment temperature has been determined to obtain particles with the largest size, best crystallinity, and minimum paramagnetic center content for practical applications. Theoretical estimates of the 19 F nuclear magnetic relaxation times for synthesized LaF 3 samples are presented, which are in good agreement with experimental data. The work may be useful in understanding the effect of hydrothermal treatment on the structure and magnetic interactions in nanoscale fluorides.
The paper presents results demonstrating, using a series of crude oil samples, the negative impact of resin glass transition effects on the accurate determination of the solid-state component of the NMR signal attributed to crystalline paraffins. To address this issue, a modified NMRbased method for quantifying paraffins and asphaltenes is proposed. The approach involves separating the crystallization temperature of paraffins from the glass transition temperature of resins by plasticizing the resins through the preliminary addition of a specific amount of solvent or precipitant to the crude oil.
On September 29, 2025, Boris Ivanovich Kochelaev, an outstanding theoretical physicist, professor-consultant of the Department of Theoretical Physics at Kazan University, and Doctor of Physical and Mathematical Sciences, passed away at the age of 91.
