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a polar crystal la 3 sbs 5 cl 2 and its preparation method

A polar crystal and crystal technology, applied in the field of polar crystal La3SbS5Cl2 and its preparation, can solve the problems of strong spontaneous polarization and high laser damage threshold at the same time

Active Publication Date: 2020-11-24
ZUNYI NORMAL COLLEGE
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of structural design that is difficult to achieve both strong spontaneous polarization and high laser damage threshold

Method used

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  • a polar crystal la <sub>3</sub> sbs <sub>5</sub> cl <sub>2</sub> and its preparation method

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Experimental program
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Embodiment 6

[0037] The volume fraction of step (1) in the embodiment three is that the nitrogen of 99.99% is replaced by the argon gas that the volume fraction is 99.99%, and the water content and the oxygen content in the water jacket box are all controlled to be 0.08ppm; The embodiment three The degree of vacuum in step (2) 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 (3) tubular resistance furnace in embodiment three is replaced by 8 °C / h by 8 °C / h, and the tubular resistance furnace is heated up to 800 ℃ is replaced by heating up to 830 ℃, and the total time of reaction is 96h replaced by 90h; the cooling rate in step (4) in embodiment three is 2.5 ℃ / h replaced by 2 ℃ / h, and the rest are the same as in embodiment three Keep consistent, and polar crystal La with uniform color and particle size can also be obtained 3 Sb 5 Cl 2 polycrystalline powder.

Embodiment 7

[0039] The volume fraction of step (1) in the embodiment three is that the nitrogen of 99.99% is replaced by the helium of the volume fraction of 99.99%, and the water content and the oxygen content in the water jacket box are all controlled to 0.06ppm; The degree of vacuum in step (2) is 10 -2 Pa is replaced by 0.7*10 -2 Pa, and the hydrogen-oxygen welding machine is replaced by an acetylene welding machine; the heating rate of the step (3) tubular resistance furnace in embodiment three is replaced by 12 °C / h, and the tubular resistance furnace is heated up to 800 ℃ is replaced by heating up to 780 ℃, and the total time of the reaction is 96h replaced by 100h; the cooling rate in step (4) in Example 3 is 2.5 ℃ / h replaced by 3.5 ℃ / h, and the rest are the same as in Example 3 Keep consistent, and polar crystal La with uniform color and particle size can also be obtained 3 Sb 5 Cl 2 polycrystalline powder.

[0040] In the specific implementation process of Examples 1-7, lan...

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Abstract

The invention discloses a polar crystal La3SbS5Cl2 and a preparation method thereof, and belongs to the field of artificial crystals. According to the present invention, the crystal is an acentric structure sulfur-chlorine mixed anion compound, the crystal system is a monoclinic system, the space group is Cc, and the unit cell parameters comprise that a is 22.259(3) angstrom, b is 7.0964(11) angstrom, c is 7.1605(9) angstrom, beta is 99.056(7) angstrom, and the unit cell volume V is 1117.0(3) angstrom3; and the preparation method comprises: carrying out a solid phase reaction on elemental lanthanum, elemental antimony, antimony trichloride and elemental sulfur under a vacuum condition.

Description

technical field [0001] The invention belongs to the field of artificial crystals, in particular to a polar crystal La 3 Sb 5 Cl 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 light frequency electric field. This optical effect related to light intensity is called nonlinear optical effect, and the crystal with the nonlinear optical effect is called nonlinear optical (NLO) crystal. [0003] The nonlinear phenomenon produced by the interaction between the laser and the nonlinear optical crystal medium will lead to frequency doubling, frequency combining, d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B28/02C30B1/10C30B29/46
CPCC30B1/10C30B28/02C30B29/46
Inventor 赵华俊伍远辉
Owner ZUNYI NORMAL COLLEGE
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