Experimental and theoretical determination of the optical rotation in langasite family crystals

Константинова, А. Ф.; Golovina, T. G.; Nabatov, B. V.; Dudka, A. P.; Mill, B. V.

doi:10.1134/s1063774515060140

Cited by 16 publications

(8 citation statements)

References 21 publications

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“…1. It is interesting to note that there is good correlation between obtained data and the experimental results of optical activity measurements for LGS ρ = −3.3 deg/mm and ρ + = 0.73 deg/mm [14,16,17]. Finally, the experimental refractive indices (calculated using the parameters of the Sellmeier equation for LGS at λ = 635 nm) are as follows: n o = 1.8998, n e = 1.9109 [1,2].…”

Section: The Electronic Polarizability Volumes Refinement Of Lgs Cryssupporting

confidence: 67%

Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

2018

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The values of electronic polarizabilities of La 3+ , Ga 3+ , Si 4+ , O 2− ions are specified using new experimental data about optical activity of La3Ga5SiO14 crystals. A calculation technique based on the dipole electron shifting model is applied to estimate linear electrooptic coefficients for the La3Ga5SiO14. Wavelength dependences of the both linear electro-optic tensor components r11 and r41 are calculated.

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Section: The Electronic Polarizability Volumes Refinement Of Lgs Cryssupporting

confidence: 67%

Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

2018

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“…However, optical transmission spectra of BNFS sample measured in polarized light on a Cary 5000 UV− vis-NIR (Varian) spectrophotometer revealed some inhomogenity of polished slices. 23 We have found that there is a problem of heterogeneity in the crystal composition in cross-section and along the axis of the crystal boule. This affects the selection of samples for accurate X-ray measurements.…”

Section: Resultsmentioning

confidence: 99%

“…The phase analysis of powder (obtained by crushing a single crystal) on a “DRON-3 modernized” digital diffractometer did not reveal any second-phase inclusions. However, optical transmission spectra of BNFS sample measured in polarized light on a Cary 5000 UV–vis-NIR (Varian) spectrophotometer revealed some inhomogenity of polished slices …”

Section: Resultsmentioning

confidence: 99%

“…The most perfect single crystals of the langasite-family (iron-free) are generally grown by the Czochralski method. 24 The crystals are characterized by optical perfection 23 and high diffraction quality. 25 However, the growth of iron-containing langasites is associated with some complexities due to a considerably lower value of the temperature gradient on the crystallization front in the Czochralski method than, for example, in a floating zone method.…”

Section: Methodsmentioning

confidence: 99%

“…The purpose of this study was the growth of single crystals of iron-containing langasites Ba 3 NbFe 3 Si 2 O 14 of sufficient diffraction quality, and X-ray diffraction study of their atomic structure at room and liquid nitrogen temperatures. In view of the search and study the multiferroic properties of langasites, the accurate structural data are necessary in order to establish the correlations between magnetic and structural properties in these crystals as well as for calculation of their optical properties . The necessity of the study under external actions (temperature, pressure) is also very important to investigate the specific features of magnetic and structural properties of these crystals at extreme conditions. − A model of BNFS structure at the temperature of liquid nitrogen is not published to date.…”

Section: Introductionmentioning

confidence: 99%

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Growth and X-ray Diffraction Study and Specific Features of Thermal Expansion of Ba₃NbFe₃Si₂O₁₄ Single Crystal from the Langasite Family

Dudka

Balbashov

Lyubutin

2016

Crystal Growth & Design

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Ba3NbFe3Si2O14 single crystals of promising multiferroic properties from the langasite family have been grown by floating zone melting. The accurate high-resolution X-ray diffraction studies of this crystal were performed on a diffractometer with a two-dimensional CCD detector at 293 and 90.5 K. To compensate systematic measurement errors, two data sets were obtained independently for different sample orientations at each temperature. The structure refinement was performed based on averaged data sets with the following results: space group P321, Z = 1; a = 8.52421(8), c = 5.23372(5) Å at 293 K; and a = 8.5211(2), c = 5.2243(7) Å, at 90.5 K. The R factors of the model structure refinement were found to be R/wR = 1.15/1.29% for 4396 independent reflections at 293 K, and R/wR = 1.13/1.35% for 4203 reflections at 90.5 K. A displacement of magnetic ion Fe3+ in the 3f site was found with reducing temperature. It was also established from comparison of the structures of Ba3NbFe3Si2O14 and Ba3TaFe3Si2O14 that the mobility of the cation in the 3f sites changes with an isomorphic substitution of Nb cations by Ta in the octahedral sites. This can change the characteristics of the structure and magnetic helix responsible for multiferroic properties of the iron-containing langasites. An anomaly in thermal expansion is found in the Ba3NbFe3Si2O14 crystal. When the temperature is reduced, the compression ratio along the c axis is about two times larger than that along the a axis, which is not typical of other langasite-family crystals.

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Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

Hu,

Zhang,

et al. 2024

Luminescence

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Recently, long persistent phosphors (LPPs) have attracted significant attention as promising candidates for biomedical applications. However, the serious decrease in luminescence intensity in tissue still remains a major challenge. Therefore, exploring more competitive LPPs and achieving reproducible tissue imaging is crucial. In this study, a new series of near‐infrared (NIR) phosphors La3Ga5Sn1‐xO14:xCr3+ (x = 0.005–0.05) were synthesized using a high‐temperature solid‐state method. The as‐synthesized samples were characterized using X‐ray diffraction, diffuse/photoluminescence spectroscopy, fluorescence decay curves, and thermoluminescence spectroscopy. Upon excitation with ultraviolet light, strong emission bands were observed in the range 600–1200 nm with an optimal doping concentration of x = 0.02 mol. Moreover, La3Ga5SnO14:Cr3+ exhibits persistent luminescence due to the presence of suitable energy traps, which prompted the phosphor to emit NIR light even after the removal of the excitation source.

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Experimental and theoretical determination of the optical rotation in langasite family crystals

Cited by 16 publications

References 21 publications

Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

Growth and X-ray Diffraction Study and Specific Features of Thermal Expansion of Ba₃NbFe₃Si₂O₁₄ Single Crystal from the Langasite Family

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence

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Experimental and theoretical determination of the optical rotation in langasite family crystals

Cited by 16 publications

References 21 publications

Calculation of Linear Electro-Optic Coefficients in La3Ga5SiO14 Crystals

Calculation of Linear Electro-Optic Coefficients in La3Ga5SiO14 Crystals

Growth and X-ray Diffraction Study and Specific Features of Thermal Expansion of Ba3NbFe3Si2O14 Single Crystal from the Langasite Family

Broadband near‐infrared (NIR) emitting Cr3+‐doped La3Ga5SnO14 phosphor with long persistent and photostimulated persistent luminescence

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Product

Resources

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Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

Calculation of Linear Electro-Optic Coefficients in La₃Ga₅SiO₁₄ Crystals

Growth and X-ray Diffraction Study and Specific Features of Thermal Expansion of Ba₃NbFe₃Si₂O₁₄ Single Crystal from the Langasite Family

Broadband near‐infrared (NIR) emitting Cr³⁺‐doped La₃Ga₅SnO₁₄ phosphor with long persistent and photostimulated persistent luminescence