4 results about "Barium borate" patented technology

This invention discloses a barium borate crystal, its preparation method, and its applications. The barium borate crystal has the chemical formula Ba₂BeB₂O₆, a non-centrosymmetric structure, belongs to the orthorhombic crystal system, has the space group Pca₂₁, and its cell parameters are α = 90°, β = 90°, and γ = 90°. This barium borate crystal exhibits extremely low birefringence from the ultraviolet to the infrared band, and its extremely low birefringence supports its application on zero-order glass slides.

The invention belongs to the technical field of optical crystal materials, and particularly relates to a melamine fluorosulfonate nonlinear optical crystal and a growth method and application thereof. The preparation method comprises the following steps: taking C3N6H6 and HSO3F as raw materials to prepare a melamine fluorosulfonate compound; and enabling the melamine fluorosulfonate crystal to directionally grow on the surface of the seed crystal by adopting a top seed crystal method to obtain the melamine fluorosulfonate nonlinear optical crystal. The spatial arrangement and the group density of a pi-conjugated [C3N6H8] group are effectively adjusted by using a fluorosulfonic acid group, and meanwhile, the compound has a relatively large frequency-doubled effect, a short ultraviolet cut-off edge and proper birefringence (0.064 at-1064nm), and can realize direct frequency-doubled output of short-wavelength ultraviolet laser. Compared with beta-barium borate, the birefringence of the material is reduced by about 44%, the walk-off effect is effectively avoided, and the material has application prospects in all-solid-state 266 nm ultraviolet lasers.

The invention discloses a preparation method of an advanced screen display ZnO-Al2O3-SiO2-based glass substrate, and belongs to the technical field of novel preparation processes of screen display glass materials. According to the technical scheme, the method is characterized in that ZnSiO3 and Al2 (SiO3) 3 are selected as glass melting raw materials, one or more of calcium borate or barium borate is selected as a cosolvent, the raw materials can be completely melted and reacted at 1260 DEG C, and the temperature of the raw materials is far lower than that of conventional oxide preparation; the clarifying agent is selected from one or more of cerium dioxide, barium sulfate, calcium sulfate or zirconium oxide, and the auxiliary materials not only serve as the clarifying agent, but also play a role of a nucleating agent in the glass crystallization process, so that sufficient use and compatible chemical effects of additives are formed, and excessive introduction of impurities is avoided. The clear glass clarification time and temperature treatment process are beneficial to regulation and control of crystallization degree and hardness, and the stability of the substrate in the process of preparing the TFT-LCD on the substrate glass in the later period is guaranteed.

The present application relates to a kind of compound barium lanthanum bromoborate and a kind of preparation method and purposes of barium lanthanum bromoborate nonlinear optical crystal, the chemical formula of the compound barium lanthanum bromoborate and its nonlinear optical crystal are all Ba 13 Br, the crystal belongs to hexagonal system, and space group is all P 63 mc , cell parameter is a=10.9580 (9) Å, b=10.7828 (6) Å, c=7.0412 (6) Å, V=732.22 (14) Å 3 , molecular weight is 1287.93, and the powder frequency doubling effect is about 6 times KDP (KH2PO4). Compound barium lanthanum bromoborate is synthesized using solid phase reaction method, barium lanthanum bromoborate nonlinear optical crystal is grown using high-temperature melt method or crystal is grown using pulling method, the crystal preparation method is simple, low in cost, and the crystal prepared has large mechanical hardness, and barium lanthanum bromoborate crystal obtained by the method is applied as nonlinear optical frequency doubling device.