Study of Pb0.5Cd0.25Lu0.25F2.25 fluorite solid solution with congruent melting nature

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Аннотация

For the first time, the optical, mechanical and conductive properties of the Pb0.5Cd0.25Lu0.25F2.25 crystalline matrix were studied in comparison with the crystals of the initial single-component fluorides. The short-wavelength transparency boundary of the three-component mixed crystal is determined by the presence of PbF2 in its composition, the IR boundary is naturally shifted up to 15 μm due to the presence of LuF3 in the composition. The refractive index of the studied solid solution n = 1.6889 on the λ = 0.6328 μm wavelength is lower than that of the PbF2 crystal due to the introduction of less polarizable components CdF2 and LuF3. For the three-component crystal, significant strengthening is observed, the microhardness HV = 2.5 GPa, which exceeds the hardness values of PbF2 and CdF2 by almost 40%. The electrical conductivity of Pb0.5Cd0.25Lu0.25F2.25 sdc at 500 K is 5.5 × 10−5 S/cm, which corresponds to the conductivity level of solid solutions M1−xLuxF2+x (M = Ca, Sr, Ba). The studied multicomponent fluoride material can be a promising crystalline medium for various photonic applications.

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Авторлар туралы

I. Buchinskaya

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Хат алмасуға жауапты Автор.
Email: buchinskayii@gmail.com
Ресей, Moscow

М. Koldaeva

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: buchinskayii@gmail.com
Ресей, Moscow

N. Sorokin

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: buchinskayii@gmail.com
Ресей, Moscow

A. Kulikov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: buchinskayii@gmail.com
Ресей, Moscow

D. Karimov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: buchinskayii@gmail.com
Ресей, Moscow

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2. Fig. 1. Region of solid solution with congruent melting character (saddle point) on concentration triangle PbF2–CdF2–LuF3 (a). Arrows schematically show the course of crystallization lines on the liquidus surface. External view of crystalline boule Pb0.5Cd0.25Lu0.25F2.25 and plate polished for research (b).

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3. Fig. 2. Diffraction pattern of Pb0.5Cd0.25Lu0.25F2.25 powder.

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4. Fig. 3. Scheme of crystallographic directions relative to the studied crystal plate (a). Diffraction reflection curves obtained on reflection 422 (b).

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5. Fig. 4. Conometric images of the sample in polarized light. The angle between the polaroids varies from 0° (a) to 90° (b).

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6. Fig. 5. Photograph of the indenter imprint at P = 0.5 N and schematic representation of the measured lengths of the diagonals d1, d2 and cracks c.

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7. Fig. 6. Dependences of microhardness (a) and fracture toughness coefficient (b) on the indenter load. Triangular symbols indicate microhardness according to Vickers, round symbols indicate measurement by the instrumental indentation method using the Berkovich pyramid.

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8. Fig. 7. Transmission spectra of Pb0.5Cd0.25Lu0.25F2.25 (1), Pb0.621Сd0.3Sr0.079F2 (2), PbF2 (3), Cd0.9Lu0.1F2.1 (4) and СdF2 (5) crystals. Sample thickness is 2 mm.

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9. Fig. 8. Temperature dependence of ionic conductivity of the Pb0.5Cd0.25Lu0.25F2.25 solid solution crystal: circles – experiment, straight line – approximation of experimental data by a linear equation (x = 103/T, y = lg (σdcT), R – correlation coefficient).

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