Compound trirubidium 9-hydroxytrichloroheptaborate, birefringent crystal of trirubidium 9-hydroxytrichloroheptaborate and preparation method and application of birefringent crystal

Abstract

The invention relates to a compound trirubidium 9-hydroxytrichloroheptaborate, a birefringent crystal of the trirubidium 9-hydroxytrichloroheptaborate and a preparation method and application of the birefringent crystal of the trirubidium 9-hydroxytrichloroheptaborate, the molecular formula of the compound is Rb3 [B (OH) 3] [B3O3 (OH) 3] 2Cl3, the molecular weight of the compound is 687.50, and the compound is prepared by adopting a mild solvent evaporation method. The chemical formula of the crystal is Rb3 [B (OH) 3] [B3O3 (OH) 3] 2Cl3, the molecular weight is 687.50, the crystal belongs to a hexagonal system, the space group is P63 / m, the cell parameters a are equal to 13.7234 (9), b is equal to 13.7234 (9), c is equal to 6.5167 (5), V is equal to 1062.87 (16) 3, Z is equal to 2, the crystal is grown by adopting a room temperature solution method or a hydrothermal method, the ultraviolet transmission cut-off edge of the crystal is 180 nm, and the birefringence is about 0.120 (532 nm). The nonahydroxy trichloro rubidium heptaborate birefringent crystal disclosed by the invention is moderate in mechanical hardness and easy to grow, cut, polish and store; the high birefringence is realized; the method has important application in the fields of optics and communication, and can be used for manufacturing polarization beam splitting prisms, phase delay devices, electro-optical modulators and the like.

Description

technical field [0001] The invention relates to a compound trirubidium nonahydroxytrichloroheptaborate and trirubidium nonahydroxytrichloroheptaborate birefringent crystal, preparation method and application, in particular to a compound whose molecular formula is Rb for visible light-deep ultraviolet waveband 3 [B(OH) 3 ][B 3 O 3 (OH) 3 ] 2 Cl 3 A birefringent crystal of trirubidium nonahydroxytrichloroheptaborate. Background technique [0002] Birefringence refers to the phenomenon that a beam of light is projected onto the surface of a crystal to produce two beams of refracted light. The fundamental reason for this phenomenon is the anisotropy of the crystal material. When light propagates in an optically heterogeneous homogeneous body (such as a crystal other than a cubic system), in addition to a few special directions (along the optical axis), its vibration characteristics will be changed, and it will be decomposed into two electric field vector vibration directio...

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Problems solved by technology

Take MgF 2 For example, its transmission range is 110-8500nm, it is a good crystal material for deep ultraviolet, but its birefringence is too small, it is not suitable for making Glan prism, it can only be used for Luo Hungarian prism, and the separation angle of light speed is small, the size of the period is large, and it is inconvenient to use; the birefringence of quartz crystal is also small, and the same problem exists; YVO 4 The crystal is also an artificially prepared birefringent crystal, and due to the YVO 4 The melting point is high, and the iridium crucible must be used for pulling growth, and the growth atmosphere is a weak oxygen atmosphere, so there is a problem of price change of yttrium element during growth, which reduces the quality of the crystal, making it difficult to obtain high-quality crystals and its penetration. The range is 400-5000nm, it cannot be directly used in the ultraviolet region

Calcite in natural form is a birefringent crystal that is widely used, but its impurity content is relatively high. Ordinary crystals can only be used in the band above 350nm. It is difficult to obtain ultraviolet optical grade calcite crystals, and its use band cannot reach the deep ultraviolet region ( <250nm)

Rutile also mainly exists in natural form, and it is difficult to synthesize artificially, and it is small in size, high in hardness, and difficult to process

Several borate birefringent crystals have been reported in recent years: the high-temperature phase BaB 2 o 4 The transmission range of the crystal is 189-3500nm, and the birefringence is relatively large, but the crystal has phase transition, which is easy to crack during the crystal growth process, which affects the yield and utilization of the crystal.

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