Dielectric nonlinearity of crystalline Li2−x NaxGe4O9 (x≈0.23)

Kudzin, A. Yu.; Volnyanskii, D. M.

doi:10.1134/1.1130916

Cited by 4 publications

(4 citation statements)

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“…According to [4], Cr 3+ ions with the 3d 3 configuration (which is isoelectronic to Mn 4+ ) in Li2-хNaхGe4O9 crystals (х = 0.28) also substitute for Ge 4+ ions within oxygen octahedra; however, such substitution Cr 3+  Ge 4+ is aliovalent and requires charge compensation. The authors of [9] (see also the references therein) considered the substitution Cr 3+ Ge 4+ in lithium heptagermanate Li2Ge7O15 crystal and proposed Li + ions interstitials (ALi) as the local charge compensators.…”

Section: The Experimental Results and Discussionmentioning

confidence: 99%

“…The studied LNG:Mn single crystals were grown by Czochralskii method [4]. An impurity of MnO was added to the charge in an amount of 0.1 wt %.…”

Section: The Experimental Techniquementioning

confidence: 99%

“…Currently, the ferroelectric crystals of lithium tetragermanate Li2Ge4O9 (LG4) and lithium sodium tetragermanate LiNaGe4O9 (LNG) are being the subjects of intensive investigations. The attention is devoted to the crystal structure [1] and dielectric properties [2][3][4]. Nevertheless, up to now optical properties of LG4 and LNG have been studied very poorly.…”

Section: Introductionmentioning

confidence: 99%

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Optical absorption of LiNaGe4O9:Mn crystal

et al. 2021

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The paper reports the results of optical absorption spectra studying in LiNaGe4O9 crystal doped with Mn. It is shown that Mn impurity causes the appearance of the additional absorption bands. The intensities of these bands change in different ways in the range of the ferroelectric phase transition. Semi-empirical version of the crystal field theory is used to discuss localization and charge state of Mn impurity ions in the LiNaGe4O9 structure.

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Section: The Experimental Results and Discussionmentioning

confidence: 99%

“…The studied LNG:Mn single crystals were grown by Czochralskii method [4]. An impurity of MnO was added to the charge in an amount of 0.1 wt %.…”

Section: The Experimental Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optical absorption of LiNaGe4O9:Mn crystal

et al. 2021

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“…The dopant MnO (0.1 wt %) was added to the initial charge previously. The crystal growth technology was briefly described in [9]. Doping with Mn led to a slightly yellowish coloration of the crystal obtained.…”

Section: Crystal Growth and Experimental Techniquementioning

confidence: 99%

EPR of LiNaGe4O9:Mn crystal

Trubitsyn,

Sidak,

Panchenko

et al. 2023

J. Phys. Electron.

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EPR spectra of manganese ions were studied in lithium-sodium tetragermanate LiNaGe4O9 crystal. The observed spectrum was typical for doping ions in tetravalent Mn4+ state (3d 3, S=3/2) and for main orientations of static magnetic field along the crystal axes (T=296 K) consisted of hyperfine sextuplet from electronic transition Ms= +1/2 ↔ – 1/2. Transitions Ms= ±3/2 ↔±1/2 were not detected owing to strong interaction of the spin system with crystal field as compared with electron Zeeman interaction in the X frequency range of EPR registration. The angular variations of the spectrum were measured for static field B rotated in three main crystal planes. Since only central transition (Ms= +1/2 ↔ – 1/2) was detected and the splitting of the fine structure remained unknown, the spectrum was described in the approximation of effective spin Seff=1/2. The parameters of the spin Hamiltonian, including electron Zeeman and hyperfine interactions, were calculated. The magnetic multiplicity of the spectrum (km=2) evidenced that paramagnetic centers occupied the sites with monoclinic C2 point symmetry. Taking into consideration the positional symmetry as well ionic charges and radii of the guest ion and the hosts, it was concluded that paramagnetic Mn4+ centers substituted for Ge4+ within oxygen octahedral complexes in the crystal lattice of LiNaGe4O9.

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