Homogeneity of elastic properties of lanthanum gallium silicate crystals

Dorogovin, B.A.; Stepanov, S.Yu.; Semenkovich, G.V.; Doubovski, A.B.; Philippov, I.M.; Buglov, Yu.P.; Danilova, G.V.

doi:10.1109/freq.2000.887353

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…В соединении LGS тетраэдрические позиции D статистически заполняются ионами кремния и галлия [8,9], в CTGS ионы элементов занимают в структуре предназначенные им позиции [14]. Относительно заполняемости позиций в LGT сведения, представленные в литературе, разнятся: в работе [12] показано, что все ионы занимают свои позиции в структуре, а в работах [8,13] показано, что ионы галлия могут занимать не только тетраэдрические позиции, но и октаэдрические позиции B. В силу заполнения позиций соединения CTGS относят к упорядоченным кристаллам, а LGS и LGT -к разупорядоченным.…”

Section: Introductionunclassified

Оптические свойства кристаллов семейства лангасита: La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-, La-=SUB=-3-=/SUB=-Ga-=SUB=-5.5-=/SUB=-Ta-=SUB=-0.5-=/SUB=-O-=SUB=-14-=/SUB=-, Ca-=SUB=-3-=/SUB=-TaGa-=SUB=-3-=/SUB=-Si-=SUB=-2-=/SUB=-O-=SUB=-14-=/SUB=-

Забелина¹,

Козлова²,

Бузанов³

2023

Оптика И Спектроскопия

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Optical properties of lanthanum-gallium silicate (La3Ga5SiO14), lanthanum-gallium tantalate (La3Ga5.5Ta0.5O14), calcium-tantalum-gallium silicate (Ca3TaGa3Si2O14) crystals in the near ultraviolet (UV) and visible wavelength ranges (200-800 nm) have been studied. For the first time the angles of deviation of the moments of the dipole transition spectral dependences theta(λ) were used to characterize the absorption processes in these crystals. These dependences make it possible to reveal absorption bands that are weakly noticeable on the transmission coefficients spectral dependences, and to estimate the degree of deviation of the dispersion dependence theta(λ) from the value theta=45o corresponding to an ideal ordered crystal. Analysis of theta(λ) dependencies showed that in the studied wavelength range, the lowest deviation from theta =45o is observed in Ca3TaGa3Si2O14, and the highest - in La3Ga5SiO14. The coefficients of the specific rotation angle of the polarization plane rho were obtained by the spectrophotometric interference method in polarized light. The measured values are best approximated by the Vyshin equation. For the first time, dependences of the modified Drude formula 1/rho=f(λ2) were calculated for these crystals. These dependences should be linear in case of an ideal crystal. The largest deviation from the linear dependence is observed for La3Ga5SiO14 crystals, and the lowest for Ca3TaGa3Si2O14. The discrete values of the refractive coefficients No and Ne were measured by the prism method. La3Ga5.5Ta0.5O14 crystals have the highest refractive coefficients, Ca3TaGa3Si2O14 crystals have the lowest. The obtained values are approximated by the Sellmeier equation.

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Section: Introductionunclassified

Оптические свойства кристаллов семейства лангасита: La-=SUB=-3-=/SUB=-Ga-=SUB=-5-=/SUB=-SiO-=SUB=-14-=/SUB=-, La-=SUB=-3-=/SUB=-Ga-=SUB=-5.5-=/SUB=-Ta-=SUB=-0.5-=/SUB=-O-=SUB=-14-=/SUB=-, Ca-=SUB=-3-=/SUB=-TaGa-=SUB=-3-=/SUB=-Si-=SUB=-2-=/SUB=-O-=SUB=-14-=/SUB=-

Забелина¹,

Козлова²,

Бузанов³

2023

Оптика И Спектроскопия

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Homogeneity of Langasite and Langatate wafers

Fachberger

Riha²,

Born³

et al.

Proceedings of the 2002 IEEE International Frequency Control Symposium and PDA Exhibition (Cat. No.02CH37234)

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Effect of doping on the optical properties of lanthanum-gallium tantalate

Zabelina,

Kozlova,

Buzanov

2023

Izv. vysš. učebn. zaved., Mater. èlektron. teh.

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Nominally pure lanthanum-gallium tantalate La3Ga5.5Ta0.5O14 crystals doped with aluminum, silicon and gallium oxide to above stoichiometric content have been grown by the Czochralski technique in iridium crucibles in argon and in agron with addition of oxygen atmospheres. The transmittance spectra of the crystals have been measured on a Cary-5000 UV-Vis-NIR spectrophotometer in the 200–800 nm range. Absorption spectra α(λ) have been plotted on the basis of the experimental data. The absorption spectra of the undoped crystals grown in an oxygen-free atmosphere have one weak absorption band at λ ~ 290 nm. The absorption spectra of the crystals grown in an agron with addition of oxygen have absorption bands at λ ~ 290, 360 and 480 nm. We show that for the crystals grown in an oxygen-free atmosphere, gallium doping to above stoichiometric content reduces the intensity of its only λ ~ 290 nm absorption band. Aluminum doping of the La3Ga5.5Ta0.5O14 crystals grown in an oxygen-free atmosphere significantly reduces the intensity of the λ ~ 290 nm absorption band and increases the intensity of the λ ~ 360 and 480 nm bands. Aluminum doping of the La3Ga5.5Ta0.5O14 crystals grown in an oxygen-containing atmosphere reduces the intensity of the λ ~ 360 and 480 nm bands and increases the intensity of the λ ~ 290 nm absorption band. Silicon doping of these crystals significantly reduces the intensity of the λ ~ 480 nm band and also reduces the intensity of the λ ~ 290 and 360 nm bands.

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Homogeneity of elastic properties of lanthanum gallium silicate crystals

Cited by 4 publications

References 9 publications

Homogeneity of Langasite and Langatate wafers

Effect of doping on the optical properties of lanthanum-gallium tantalate

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