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Incorporation of Manganese (II) in Beta-Tricalcium Phosphate from EPR and ENDOR Measurements for Powders
Ceramics. 2022. Vol. 5. No. 3. P. 318–329.
Murzakhanov F., Forysenkova Anna A., Fadeeva I., Mamin G., Gafurov M.
Powders of β-tricalcium phosphate (β-TCP, Ca3PO4) doped with manganese (Mn2+) are comprehensively analyzed with electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) techniques. The modeling of the spectra permitted to calculate the values of zero-field splitting (𝐵02 = −904 MHz; 𝐵04 = −1.41 MHz and 𝐵34 = 195.2 MHz) and explain the origin of the low-field hyperfine structures as the allowed spin transitions of fine structure. Three structurally inequivalent positions for Mn2+ in the β-TCP crystal lattice are identified and their g-factors and hyperfine constants are quantified. The obtained results can serve as fundamental background to the study of structurally disordered matrices with high spin (S ≥ 1) impurities which are important for catalytic systems.
Mehrabi-Kalajahi S., Vasigh S. A., Wu X. et al., The Journal of Physical Chemistry Letters 2025 Vol. 16 No. 46 P. 12113–12123
The solvent-free and aerobic oxidation of benzyl alcohol is an exceptionally efficient approach for synthesizing benzaldehyde; however, the conversion rates and selectivity are still insufficient as effective catalysts need to successfully activate both the O–H bond and the O2 molecules. In this study, various layered double hydroxides (LDHs) were successfully prepared and employed for the oxidation ...
Added: November 22, 2025
Petrakova N., Demina A., Zobkova Y. et al., Journal of Alloys and Compounds 2025 Vol. 1037 Article 181865
The hydroxyapatite powders with co-doping of Ca2+ with Na+ and Ce3+ were obtained by aqueous precipitation.
Co-doping was considered as a method of charge compensation in the cationic sublattice of the HA structure by
means of the 2Ca2+→Ce3+ + Me+ in order to maintain the stability of phase composition, improve the optical
and microstructural properties of the HA ...
Added: November 5, 2025
Fadeeva I., Forysenkova Anna A., Fomin A. et al., Inorganic Materials 2023 Vol. 59 No. 7 P. 765–769
Unsubstituted tricalcium phosphate (TCP) and Mn/Sr-cosubstituted TCP have been prepared by solid-state synthesis at 1200°C. The synthesized compounds have been characterized by X-ray diffraction, IR spectroscopy, and scanning electron microscopy. The results indicate that solid-state synthesis of TCP and Mn,Sr-TCP yields compounds with the whitlockite structure. We have determined their lattice parameters and demonstrated the ...
Added: August 13, 2025
Fadeeva I., Barbaro K., Altigeri A. et al., Nanomaterials 2024 Vol. 14 No. 6 P. 495–510
Addressing periprosthetic infections, which present significant healing challenges that often require revision surgeries, necessitates the development of novel antibacterial materials and implants. Current research focuses on creating materials that hinder bacterial adhesion, colonization, and proliferation in surrounding tissues. Boron (B)-containing compounds are known for their antibacterial properties and potential in bone metabolism for regenerative medicine. ...
Added: August 13, 2025
Fadeeva I., Deyneko D., Forysenkova Anna A. et al., Molecules 2022 Vol. 27 No. 18 P. 6085–6103
Sr2+-substituted β-tricalcium phosphate (β-TCP) powders were synthesized using the mechano-chemical activation method with subsequent pressing and sintering to obtain ceramics. The concentration of Sr2+ in the samples was 0 (non-substituted TCP, as a reference), 3.33 (0.1SrTCP), and 16.67 (0.5SrTCP) mol.% with the expected Ca3(PO4)2, Ca2.9Sr0.1(PO4)2, and Ca2.5Sr0.5(PO4)2 formulas, respectively. The chemical compositions were confirmed by the energy-dispersive ...
Added: August 12, 2025
Forysenkova Anna A., Ivanova V., Fadeeva I. et al., Materials 2023 Vol. 16 No. 7 P. 2832–2843
Alginate is a natural polymer widely applied in materials science, medicine, and biotechnology. Its ability to bind metal ions in order to form insoluble gels has been comprehensively used to create capsules for cell technology, drug delivery, biomedical materials, etc. To modify and predict the properties of cross-linked alginate, knowledge about the mechanism of alginate ...
Added: August 12, 2025
Sadovnikova M., Murzakhanov F., Fadeeva I. et al., Ceramics 2022 Vol. 5 No. 4 P. 1154–1166
Tricalcium phosphate (TCP)-based materials, such as β-Ca3(PO4)2 doped with rare earth ions (RE), have shown applications as biomaterials, lighting emitting materials, scintillating materials, in vivo imaging probes, and thermoluminescent dosimeters. Their properties are found to be dependent on the distribution of RE3+ on Ca2+ sites that can be controlled by pulsed electron paramagnetic resonance (EPR) and electron spin ...
Added: August 12, 2025
S. K. Gotovko, Ivanova A. G., P. S. Kudimkina et al., Physical Review B: Condensed Matter and Materials Physics 2025 Vol. 111 No. 6 Article 064430
We present the study of low-frequency dynamics of LiCu3O3—an antiferromagnet on a strongly depleted square lattice. The crystal structure contains two types of square planes with different Li+→Cu2+ substitution rates (20% and 40%). Recent nuclear magnetic resonance (NMR), magnetization measurements and neutron scattering experiments revealed the occurrence of antiferromagnetic order at 𝑇𝑐1=123K and the change ...
Added: March 3, 2025
S. V. Demishev, Shestakov A. V., Yatsyk I. V. et al., Solid State Communications 2024 Vol. 385 Article 115501
In the spiral conical phase of manganese monosilicide, MnSi, the EPR spectra are studied at a frequency of 9.3
GHz in the temperature range of 5–30 K for an external magnetic field oriented along the crystallographic di
rection [100]. It is found that in the temperature range T < T* = 25 K, located 4 K below ...
Added: February 9, 2025
Demishev S. V., Applied Magnetic Resonance 2024 Vol. 55 P. 1091–1114
Semiclassical magnetization dynamics in presence of magnetic fluctuations (including the quantum ones) is derived for a strongly correlated electronic system in the region of the linear magnetic response. Landau–Lifshitz (LL) and Gilbert (G) type equations are obtained with the effective parameters depending on the type of magnetic fluctuations and their magnitude and applied to evaluation ...
Added: February 9, 2025
Smirnov I., Biriukov K., Shvydkiy N. et al., Journal of Organic Chemistry 2024 Vol. 89 No. 14 P. 10338–10343
Manganese complexes [(arene)Mn(CO)3]+ were prepared in one step from arenes and Mn(CO)5Br. They were found to be efficient catalysts in the carbonyl cyanation with TMSCN, CO2 fixation by epoxides, and direct reductive amination in the presence of syngas. The amination reaction tolerated various reducible functional groups. The synergy of carbon monoxide and hydrogen in syngas provides high ...
Added: January 23, 2025
Trofimov E., Ahmad Ostovari Moghaddam, Litvinyuk K. et al., Materials Letters 2025 Vol. 379 Article 137668
The possibility of fabricating novel high-entropy oxides (HEOs) with one ultrahigh-entropy sublattice consisting of 13 cations in RE2A2O7 (RE = [La, Sm, Nd, Gd, Dy, Yb, Y, Er, Eu, Tb, Ho, Lu, Tm], A = Zr, Hf, Ti, Sn, Ce or Pr) is demonstrated. All the samples exhibited a pure pyrochlore-type or defective fluorite crystalline structure with various ...
Added: January 7, 2025
Morkhova Y., Orlova E., Kabanov A. et al., Solid State Ionics 2023 Vol. 400 Article 116337
The conductivity in the monoclinic polymorphs of Ln2MoO6 (Ln = Sm, Gd, Dy) oxymolybdates was investigated by theoretical and experimental methods. A theoretical approach consisted of geometrical-topological analysis, bond valence site energy, kinetic Monte-Carlo (KMC) modeling and density functional theory (DFT) calculations. The theoretical results have shown that oxygen ionic conductivity is possible in all ...
Added: August 30, 2023
Копылов В. П., Shelov-Kovedyaev F. V., Вестник древней истории 2023 Т. 83 № 2 С. 391–401
The paper publishes the manufacturer’s measuring stamp (Βι~) founded at 2016 in excavations of Elizavetovskoye settlement on Lower Don ...
Added: July 4, 2023
Shlyakhtina A. V., N. V. Lyskov, Kolbanev I. V. et al., Russian Journal of Electrochemistry 2023 Vol. 59 No. 1 P. 60–69
The hexagonal solid solution La2W1 + xO6 + 3x (x ~ 0.11) and the rhombohedral low-temperature phase β-La2WO6 (La2W1 + xO6 + 3x (x = 0)) are synthesized by the methods of preliminary mechanical activation of oxides followed by high-temperature synthesis at 1400°С, 4 h. In addition, by using the method of crystallization from solution, ...
Added: March 24, 2023
Gagieva S., Kurmaev D., Magomedov K. et al., European Polymer Journal 2022 Vol. 180 Article 111611
A series of ionic complexes of composition [M. Crown]+ [TiCl5]-, where M - Li, Na, K; Crown - dibenzo-18-Crown-6, benzo-15-crown-5, dibenzo-24-crown-8 has been synthesized by the interaction of alkali metal chlorides, titanium tetrachloride and crown ethers in anhydrous toluene. Carrying out these syntheses in acetonitrile results in crystallization of complexes solvated with acetonitrile. The structure ...
Added: January 31, 2023
Kuznetsova S., Yunusov S., Gak A. et al., ChemistrySelect 2022 Vol. 7 No. 41 Article e202203011
Hydrogen bonded crystalline organic salt matrix encapsulates Pd nanoparticles and makes them selective non-pyrophoric catalysts towards reduction of carbon – carbon triple bonds, inhibiting simultaneous C=O reduction. The comparison of the catalytic performance with Pd/C was carried out to show similar catalytic activity of both catalysts towards C=C bonds. ...
Added: January 31, 2023
Sosin S., Яфарова А. Ф., Романова И. В. et al., Письма в Журнал экспериментальной и теоретической физики 2022 Т. 116 № 11-12 С. 747–755
Low-temperature electron paramagnetic resonance measurements are performed on single crystals of LiY1 – xGdxF4 with low x = 0.005 and moderate x = 0.05 concentration of Gd ions. Modeling of the experimental spectra allows us to precisely determine microscopic parameters of the spin Hamiltonian of the parent LiGdF4 material, including the nearest-neighbor exchange constant. The obtained parameters ...
Added: December 7, 2022
Ivanova A., Pasechnyuk D., Grishchenko D. et al., , in: Optimization and Applications: 12th International Conference, OPTIMA 2021, Petrovac, Montenegro, September 27 – October 1, 2021, Proceedings.: Switzerland: Springer, 2021. Ch. 268319 P. 20–37.
In this paper, we present a generic framework that allows accelerating almost arbitrary non-accelerated deterministic and randomized algorithms for smooth convex optimization problems. The major approach of our envelope is the same as in Catalyst [37]: an accelerated proximal outer gradient method, which is used as an envelope for a non-accelerated inner method for the ...
Added: October 30, 2022
Demishev S. V., Doklady Physics 2021 Vol. 66 No. 7 P. 187–190
The Landau–Lifshitz equation modified by quantum fluctuations of the magnetic moment is proposed, on the basis of which several new effects in electron paramagnetic resonance in strongly correlated electronic systems are predicted, including an increase in the integral intensity and the appearance of universal relations connecting the contribution to the linewidth, the shift of the ...
Added: October 25, 2022
Demishev S. V., Semeno A. V., Applied Magnetic Resonance 2022 Vol. 53 No. 11 P. 1505–1516
A simple semi-classical model of magnetization dynamics based on Landau-Lifshits equation of motion with anisotropic effective g-tensor and anisotropic spin relaxation is proposed and applied to the case of electron paramagnetic resonance (EPR). In the Faraday geometry, the model predicts polarization effect consisting in strong dependence of the EPR line shape and magnitude on orientation ...
Added: October 25, 2022
Serovaiskii A., Kutcherov V., Vinokurov V. et al., The Journal of Physical Chemistry Letters 2022 Vol. 13 No. 43 P. 10114–10119
BiScO3 compound was obtained in the form of dense ceramic with a perovskite-type structure, and its complex characterization was determined for the first time. The corresponding synthesis procedure is described in detail. It is demonstrated that the temperature region of the phase stability at atmospheric pressure lies at T < 700 °C (973 K). It is shown that ...
Added: October 24, 2022
Kurdin K., Kuznetsov V., Vitaly V. Sinitsyn et al., Catalysis Today 2022 Vol. 388-389 P. 147–157
Two relatively simple synthetic procedures were developed for the synthesis of Pt–HxMoO3 composites. The
obtained materials may be of interest as CO-tolerant catalysts for hydrogen-air fuel cells with proton-exchange
membranes (PEMFCs). The first step of both syntheses was to prepare hydrogen molybdenum bronzes (HxMoO3)
through the addition of Zn powder to acidic solutions containing Mo(VI) species. Two types ...
Added: September 16, 2022