Electron paramagnetic resonance studies of manganese centers in SrTiO3: Non-Kramers Mn3+ ions and spin-spin coupled Mn4+ dimers

Azamat, D. V.; Dejneka, A.; Lančok, J.; Трепаков, В. А.; Jastrabı́k, L.; Badalyan, A. G.

doi:10.1063/1.4723653

Cited by 37 publications

(29 citation statements)

References 39 publications

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“…Coordination compounds with manganese ions in oxidation state Mn(II), d 5 , with low spin, s = 1 2 , are less frequent that those of a high spin state, and a 2 T 2g ground state in an O h symmetry. The ESR of 1 showed Mn(II) species with a g = 1.87 value corresponding to low spin ( Figure 5), in accord with theoretical and experimental reports as typical values g < 2.0023 [68,71,72]. The Mn(III) species of 1 showed a signal with g = 2.760 value.…”

Section: Proton Nuclear Magnetic Resonancesupporting

confidence: 86%

“…All ESR experiments of 1 are consistent with three different oxidation and spin states for the manganese ions present (Figure 7). 1 contains four manganese ions with a strong ligand field induced by five oxygen and one nitrogen ligand, which stabilize the low spin of Mn(II), s = 1 2 , and of Mn(III), s = 1, and the high spin of Mn(IV), s = 3 2 [71,72]. The ESR of Mn(II), Mn(III), and Mn(IV) ions present in 1 is described by the spin Hamiltonian for these 3d 3 , 3d 4 and 3d 5 electronic systems in an axial distorted octahedral coordination sphere,Ĥ = gβ…”

Section: Proton Nuclear Magnetic Resonancementioning

confidence: 99%

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Tetramer Compound of Manganese Ions with Mixed Valence [MnII MnIII MnIV] and Its Spatial, Electronic, Magnetic, and Theoretical Studies

et al. 2018

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Using different spectroscopic techniques and computational calculations, we describe the structural and electromagnetic relationship that causes many interesting phenomena within a novel coordination compound with mixed valence manganese (II, III and IV) in its crystal and powder state. The novel compound [MnII MnIII MnIV(HL)2(H2L)2(H2O)4](NO3)2(H2O) 1 was obtained with the Schiff base (E)-2-((2-hydroxybenzylidene)amine)-2-(hydroximethyl)propane-1,3-diol, (H4L), and Mn(NO3)2.4H2O. The coordination reaction was promoted by the deprotonation of the ligand by the soft base triethylamine. The paper’s main contribution is the integration of the experimental and computational studies to explain the interesting magnetic behavior that the mixed valence manganese multimetallic core shows. The results presented herein, which are rarely found for Mn(II), (III) and (IV) complexes, will contribute to the understanding of the magnetic communication generated by the valence electrons and its repercussion in the local geometry and in the overall crystalline structure.

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Section: Proton Nuclear Magnetic Resonancesupporting

confidence: 86%

Section: Proton Nuclear Magnetic Resonancementioning

confidence: 99%

Tetramer Compound of Manganese Ions with Mixed Valence [MnII MnIII MnIV] and Its Spatial, Electronic, Magnetic, and Theoretical Studies

et al. 2018

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“…eV O centres have been also observed [58]. In the compound of 1.0 wt% Mn the appropriate dependence of ε 00 on the frequency is dominated by ε 00 (f)~1/u n in the whole range of temperatures from 20 C to 300 C (Fig.…”

Section: Resultsmentioning

confidence: 85%

Effects of Mn doping on dielectric properties of ferroelectric relaxor PLZT ceramics

Dimza

Попов

Lace

et al. 2017

Current Applied Physics

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A series of PLZT (8/65/35) ceramics with different Mn 2 O 3 concentration (0.01, 0.1, 0.3, 1.0, and 3.0% by weight) have been synthesized to figure out its influence on their dielectric properties. The complex dielectric permittivity ε* ¼ ε 0 Àiε 00 as function of frequency and temperature as well as polarisation loops P(E) have been studied as a function of Mn concentration. It was found that Mn doping is restrained the Vogel-Fulcher law held in the unmodified PLZT compound producing essential change of the dependence of ε* on temperature and frequency and of the shape of P(E). The observed effects are explained by gradual involvement of Debye and Maxwell-Wagner polarisation mechanisms in relaxation processes with the growth of the concentration of Mn concentration admixture. A decrease of the ε'(T) maximum value and shift of the maximum to higher temperatures is observed. The observed effects are attributed to impacts of Mn 2þ and Mn 3þ ions: formation of oxygen vacancies paired with Mn 2þ as dipoles and Jahn-Teller distortion prompted by Mn 3þ ions.

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“…Reduced TiMn samples also exhibit EPR signals (sextet pattern with hyperfine splitting of around 84 Oe and Lande g factor of 2.005) due to the presence of Mn 2+ ions at the octahedral site associated with the presence of oxygen vacancies [14,16,17]. Further, in reduced Mn-doped STO samples, EPR signals corresponding to Mn 3+ -V O (V O denotes an oxygen vacancy site) centres [18] can also be observed. However, the presence of Mn 3+ ions was ruled out for SrMn or TiMn samples prepared by mixed-oxide methods in air or nitrogen gas atmospheres [15].…”

Section: Mn Doping Inmentioning

confidence: 88%

Site-specific doping, tunable dielectric properties and intrinsic paramagnetism in Mn-doped SrTiO 3

Choudhury

2015

Pramana - J Phys

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Mn doping in SrTiO 3 leads to the emergence of qualitatively distinct and novel physical properties. We show that Mn ions can be controllably doped at either of the perovskite A (Sr) or B (Ti) site as well as at both sites simultaneously and the resultant physical properties depend intimately on the particular dopant site. We critically review the recent literature on various Mn-doped SrTiO 3 systems, which includes reports of dielectric glass, spin-glass and ferromagnetism and by combining experiments with first-principles calculations, we demonstrate that depending on the particular dopant site for Mn ions, the dielectric properties can be widely tuned from a quantum paraelectric to a dielectric glass. However, the intrinsic magnetism in all these cases remains essentially paramagnetic for phase-pure systems.

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Electron paramagnetic resonance studies of manganese centers in SrTiO3: Non-Kramers Mn3+ ions and spin-spin coupled Mn4+ dimers

Cited by 37 publications

References 39 publications

Tetramer Compound of Manganese Ions with Mixed Valence [MnII MnIII MnIV] and Its Spatial, Electronic, Magnetic, and Theoretical Studies

Tetramer Compound of Manganese Ions with Mixed Valence [MnII MnIII MnIV] and Its Spatial, Electronic, Magnetic, and Theoretical Studies

Effects of Mn doping on dielectric properties of ferroelectric relaxor PLZT ceramics

Site-specific doping, tunable dielectric properties and intrinsic paramagnetism in Mn-doped SrTiO 3

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