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Зубков, В. Г.; Сурат, Л. Л.; Tyutyunnik, A. P.; Berger, I. F.; Tarakina, Nadezda V.; Slobodin, B. V.; Kuznetsov, M. V.; Денисова, Т. А.; Журавлев, Н. А.; Perelyaeva, L. A.; Бакланова, И. В.; Shein, I. R.; Ivanovskiĭ, A. L.; Шульгин, Б. В.; Ищенко, А. В.; Tcherepanov, A. N.; Svensson, Gunnar; Forslund, B.; Skripkin, M. Yu.

doi:10.1103/physrevb.77.174113

Cited by 21 publications

(10 citation statements)

References 25 publications

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“…The crystal structure of Ln 2 CaGe 4 O 12 , Ln ¼ lanthanides or Y, consists of alternating layers of cations and tetracycles [Ge 4 O 12 ] (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…4, Raman spectra are shown in the inset). In this case, the excitation energy is lower than the energy of the 4 I 11/2 manifold, but the difference between the excitation energies 10,246 and 9398 cm À1 equals 848 cm À1 which corresponds to the value of the totally symmetric vibration O(2)-Ge-O(2), n$850 cm À1 [4]. Fig.…”

Section: Article In Pressmentioning

confidence: 93%

“…When such a system is excited, the former type makes the main contribution to inelastic scattering of the exciting electromagnetic radiation [3,4]. In this process, the heavy cationic sublattice behaves as a reservoir for energy dissipation upon the relaxation of a polyatomic anionic group from the excited to the ground state.…”

Section: Article In Pressmentioning

confidence: 99%

“…The non-radiative transition 4 I 11/2 -4 I 13/2 should be accompanied by an energy dissipation of $3500 cm À1 , which is a rather large value for this type of transition. We can assume that in the before-mentioned process, the collective breathing modes of the tetracycle [Ge 4 O 12 ] 8À can also take place. The relationship between the laser excitation energy E ex , the stimulated luminescence due to the f-f transition in Ln 3+ (DE) and the energy of totally symmetric vibrations O reads E ex ¼ DE+nO, where n is the number of optical phonons with the energy O.…”

Section: Article In Pressmentioning

confidence: 99%

See 3 more Smart Citations

Luminescence in Ln2CaGe4O12 under infrared laser excitation

Зубков

Leonidov

Tyutyunnik

et al. 2009

Journal of Luminescence

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“…The crystal structure of Ln 2 CaGe 4 O 12 , Ln ¼ lanthanides or Y, consists of alternating layers of cations and tetracycles [Ge 4 O 12 ] (Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 93%

Section: Article In Pressmentioning

confidence: 99%

Section: Article In Pressmentioning

confidence: 99%

See 2 more Smart Citations

Luminescence in Ln2CaGe4O12 under infrared laser excitation

Зубков

Leonidov

Tyutyunnik

et al. 2009

Journal of Luminescence

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“…Oxide matrices are still investigated widely in the field of optics, and luminescence properties in particular. Crystalline materials with cyclic anions [A 4 O 12 ], A = P [11,12], Si [13], V [14], Ge [15,16], in the structure are among them. Besides the problem of energy transfer Yb 3+ → Er 3+ (and/or Ho 3+ , Tm 3+ ) efficiency the other one lies in effective cooperative energy transfer in the nonresonant systems that may occur via phonon-assisted anti-Stokes sideband excitation [17].…”

Section: Introductionmentioning

confidence: 99%

Upconversion luminescence in Er3+/Yb3+ codoped Y2CaGe4O12

Leonidov

Зубков

Tyutyunnik

et al. 2011

Journal of Alloys and Compounds

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A New Sodium Calcium Cyclotetravanadate Framework: “Zero‐Strain” during Large‐Capacity Lithium Intercalation

Yang

Liang

Cao

et al. 2021

Adv Funct Materials

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Zero-strain" materials with little lattice strain and volume change during long-term cycling are ideal electrode choices for long-life lithium-ion batteries. However, the very limited "zero-strain" materials explored generally show small capacities (<200 mAh g −1 ), and the origin of "zero-strain" is still unclear. Here, Na 2 Ca(VO 3 ) 4 (NCVO) nanowires are explored as a new anode material capable of keeping single-phase-transition "zero-strain" during large-capacity (381 mAh g −1 ) Li + intercalation. NCVO owns a crystal structure with isolated [V 4 O 12 ] 4− tetracycles separated by large-sized NaO 6 octahedra and CaO 8 square antiprism decahedra, generating large-sized quadrilateral and hexagonal channels (≈3.6 Å). During lithiation, two-electron transfer per vanadium is accomplished, introducing a large amount of Li + into interstitial sites and increasing the size of reduced vanadium ions. The former and latter expansion effects are eliminated by the superior volume-buffering capabilities of the sufficiently large interstitial sites and electrochemical inactive Na-/Ca-based polyhedra, respectively, thus achieving "zero-strain" with the maximum volume variation of only 0.039% and mean strain of only 0.060%. Therefore, the NCVO nanowires exhibit exceptional cyclic stability, as demonstrated by 93.8%/93.2%/94.7% capacity retention over 2000/2000/7000 cycles at 1C/2C/10C. The understanding of the crystal-structural features for "zero-strain" provides a guide for the future designs of "zero-strain" energy-storage materials.

show abstract

Structural, vibrational, electronic, and luminescence properties of the cyclotetravanadatesA2M(VO3)4(

Cited by 21 publications

References 25 publications

Luminescence in Ln2CaGe4O12 under infrared laser excitation

Luminescence in Ln2CaGe4O12 under infrared laser excitation

Upconversion luminescence in Er3+/Yb3+ codoped Y2CaGe4O12

A New Sodium Calcium Cyclotetravanadate Framework: “Zero‐Strain” during Large‐Capacity Lithium Intercalation

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