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Polar crystal La3SbS4OCl2 and preparation method thereof

A polar crystal and crystal technology, which is applied in the field of polar crystal La3SbS4OCl2 and its preparation, can solve the problem of insufficient laser damage threshold of polar crystals, and can improve the laser damage threshold, enhance ionicity, and increase spontaneous polarization intensity. Effect

Active Publication Date: 2022-02-25
HUANGSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the laser damage threshold of this polar crystal is not high enough

Method used

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  • Polar crystal La3SbS4OCl2 and preparation method thereof

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Experimental program
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Effect test

Embodiment 1-5

[0021] Polar crystal La in Example 1-5 of the present invention 3 Sb 4 OCl 2 The composition and dosage of synthetic raw materials are shown in Table 1.

[0022] The consumption of each raw material in table 1 embodiment 1-5

[0023] Ingredients Example 1 Example 2 Example 3 Example 4 Example 5 Elemental lanthanum / g 0.2 0.23 0.1751 0.1511 0.1300 Lanthanum trichloride / g 0.1009 0.1160 0.0883 0.0762 0.0656 Elemental antimony / g 0.0250 0.0288 0.0219 0.0189 0.0163 Antimony trioxide / g 0.0600 0.0670 0.0525 0.0453 0.0390 Elemental sulfur / g 0.0791 0.0910 0.0693 0.0598 0.0515

[0024] Specifically, polar crystal La in embodiment 1-5 3 Sb 4 OCl 2 The preparation method is as follows:

[0025] (1) Weigh elemental lanthanum, lanthanum trichloride, elemental antimony, antimony trioxide, and elemental sulfur in a glove box full of nitrogen, and the specific amounts are shown in Table 1; the glove box is made of M....

Embodiment 6

[0031] Compared with Example 3, the difference is only that there is a difference in the parameters in each step; specifically as follows: the volume fraction of step (1) in Example 3 is replaced by 99.99% nitrogen by volume fraction as 99.99% argon, and The water content and the oxygen content in the water jacket box are all controlled to be 0.08ppm; The vacuum degree of step (3) in the embodiment 3 is 10 -2 Pa is replaced by 0.8×10 -2 Pa, and the hydrogen-oxygen welding machine is replaced by an acetylene welding machine; the heating rate of the step (4) tubular resistance furnace in embodiment 3 is replaced by 18 °C / h at 20 °C / h, and the tubular resistance furnace is heated to 950 °C was replaced by heating up to 980 °C, and the total reaction time was replaced by 110 h from 117 h; the cooling rate in step (5) in Example 3 was replaced by 2 °C / h from 2.5 °C / h.

[0032] The remaining steps and condition parameters are consistent with those in Example 3, and polar crystal La...

Embodiment 7

[0034] Compared with Example 3, the difference is only that there is a difference in the parameters in each step; specifically as follows: the volume fraction of step (1) in Example 3 is 99.99% nitrogen replaced by 99.99% helium by volume fraction, and The water content and the oxygen content in the water jacket box are all controlled to be 0.06ppm; The vacuum degree of step (3) among the embodiment 3 is 10 -2 Pa is replaced by 0.7×10 -2 Pa, and the oxyhydrogen welding machine is replaced by an acetylene welding machine; the heating rate of the step (4) tubular resistance furnace in embodiment 3 is replaced by 22 °C / h for 22 °C / h, and the tubular resistance furnace is heated to 950 °C was replaced by raising the temperature to 930 °C, and the total reaction time was replaced by 121 h from 117 h; the cooling rate in step (5) in Example 3 was replaced by 3 °C / h from 2.5 °C / h.

[0035] The remaining steps and condition parameters are consistent with those in Example 3, and polar...

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Abstract

The invention discloses a polar crystal La3SbS4OCl2 and a preparation method thereof, and relates to the technical field of intraocular lens, the crystal is a sulfur-oxygen-chlorine mixed anion compound with a non-centrosymmetric structure, the crystal system is a hexagonal crystal system, the space group is P63mc, and the unit cell parameter unit cell volume is prepared in a way that under the protection of inert gas according to the stoichiometric ratio of La3SbS4OCl2, elemental lanthanum, lanthanum trichloride, elemental antimony, antimony trioxide and elemental sulfur are mixed and then put into a quartz tube, vacuumized, heated to 920-980 DEG C, a solid-phase chemical reaction is performed, and cooling is performed, thereby obtaining the product. According to the invention, the anti-laser-damage functional element is utilized to regulate and control the SbS3 triangular pyramid structure units of the polar functional element to realize equidirectional arrangement, so that the spontaneous polarization intensity is increased, the non-centrosymmetric structure is assembled on the molecular level, and the polar crystal La3SbS4OCl2 is successfully synthesized. The polar crystal has strong spontaneous polarization intensity and high laser damage threshold.

Description

technical field [0001] The invention relates to the technical field of artificial crystals, in particular to a polar crystal La 3 Sb 4 OCl 2 and its preparation method. Background technique [0002] When the light propagates through the crystal, it will cause the electric polarization of the crystal. When the light intensity is small, there is a linear relationship between the electric polarization intensity of the crystal and the optical frequency electric field; when the light intensity is large, such as laser, the electric polarization intensity of the crystal There is a nonlinear relationship with the optical frequency electric field. This optical effect related to light intensity is called nonlinear optical effect, which will lead to frequency doubling, combined frequency, difference frequency, parametric oscillation, parametric amplification or harmonics of light. Crystals with the nonlinear optical effect are called nonlinear optical (NLO) crystals. Due to the fre...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B1/10G02F1/355
CPCC30B29/46C30B1/10G02F1/3551Y02E60/10
Inventor 赵华俊李长江方辉平
Owner HUANGSHAN UNIV
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