Nickel cobalt potassium sulfate hexahydrate crystal for ultra-violet light band filter

A technology of nickel sulfate hexahydrate and ultraviolet light, which is applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems that it is difficult to control and obtain a complete single crystal, and the crystal and solution cannot be observed, so as to achieve the expansion of processing and production , good effect

Inactive Publication Date: 2007-06-20
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Problems solved by technology

Both blue-green NSH and KNSH crystals can grow large-sized single crystals by the cooling method of aqueous solution, while CNSH crystals and their saturated solutions are dark brown, opaque to visible light, and the sites of crystals and solutions cannot be observed with the naked eye, so they can only crystallize spontaneously , it is difficult to control and obtain a complete single crystal of usable size

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  • Nickel cobalt potassium sulfate hexahydrate crystal for ultra-violet light band filter

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Embodiment Construction

[0019] Raw materials: domestic analytically pure K 2 SO 4 , NiSO 4 ·6H 2 O and CoSO 4 ·7H 2 O reagent, the molar ratio is 1:1:0.3 dissolved in twice distilled water.

[0020] Preparation of saturated solution: The above raw materials were prepared into a 500ml saturated solution at 55°C, the solution was brownish green, pH=5.5. Filter with a 0.15um microporous membrane, overheat the solution at 60°C for 10 hours, then cool down naturally to a constant temperature of 58°C to release the seed crystals.

[0021] KCNSH crystal growth: A glass jar with a diameter of 7 cm and a volume of 500 ml was selected as the growth container. The solution is transparent under visible light, and can be observed and controlled in real time by the solution cooling method. The spontaneously crystallized 2mm dark green small crystal is used as the seed crystal to cool and grow in the solution. The temperature control accuracy is ±0.01°C, and the forward and reverse rotation speed of the cryst...

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Abstract

Nickel-cobalt-potassium crystal sulfate hexahydrate crystal for ultraviolet light band filter has molecular formula: K2CoO.1Ni0.1Ni0.9(SO4)2.6H2O, molecular weight is 437.15monoclinic space group P2(1) / C, crystal cell parameter a=6.1390(3), b=12.1839(6), c=9.0095(4), alpha=gamma=90degree, beta=105.062(2)degree, v=650.74(5), 3,Z=2, DC=2.231g / cm3. It has high transmittance and visible-light absorbing function, and it could real-time observe and control growth process in saturated solution and realized crystal growth by solution temperature-decreasing method.

Description

technical field [0001] The present invention relates to optics and artificial lens materials. Background technique [0002] As a crystal passband filter, it must have the characteristic that the transmission spectrum is discontinuous, so that the passing light band has a high transmittance and a narrow bandwidth, while the light in other bands is strongly absorbed. Nickel sulfate hexahydrate (NiSO 4 ·6H 2 NSH for short) crystal is an excellent ultraviolet filter crystal material, which has been widely used in spectroscopy and laser technology. As an ultraviolet passband filter and sensor, in 1998 N·B·Singh, W·D·Pantlow invented a new ultraviolet filter crystal with better thermal stability than NSH crystal nickel potassium sulfate hexahydrate (K 2 Ni(SO 4 ) 2 ·6H 2 O is referred to as KNSH), (N.B.Singh, W.D.Pantlow, U.S.Patent 5788764, Aug, 4, 1998). NSH and KNSH crystals have high transmittance (>80%) near the ultraviolet band (254nm). Although they have a filteri...

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Application Information

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IPC IPC(8): C30B29/10C30B29/46C30B7/08
Inventor 苏根博庄欣欣贺友平郑国宗
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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