Hafnium iron manganese three-doped lithium niobate crystal and method of producing the same

A technology of lithium niobate and iron manganese, applied in the field of lithium niobate crystal and its preparation, can solve the problems of information volatility, long response time of three-dimensional holographic memory, etc., and achieve the effect of improving photorefractive performance and solving long response time.

Inactive Publication Date: 2008-12-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a hafnium-iron-manganese triple-doped lithium niobate crystal and its preparation method to solve the problems of long response time and volatility of information in the information access process of the three-dimensional holographic memory, so that it can truly It is used for real-time access to information and enables information to be stored for a long time while being read repeatedly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Weighing the purity is Li 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , MnO, HfO 2 , according to 9.34360: 10.000: 0.0078125: 0.004694: 0.5000, dry the raw materials at a constant temperature of 200°C for 2 hours, then fully mix them on the mixer for 24 hours, and keep the temperature at 800°C for two hours to make Li 2 CO 3 It is fully decomposed and calcined at 1100°C for 2 hours to obtain a polycrystalline powder of hafnium, iron, manganese, and lithium niobate crystals.

[0024] (2) Compact the hafnium-iron-manganese tri-doped lithium niobate polycrystalline powder obtained in step (1), put it into a platinum crucible, and use medium frequency induction to heat until the powder is completely melted. Use the Czochralski method to grow hafnium-iron-manganese tri-doped lithium niobate crystals along the C-axis according to the processes of neck pulling, shouldering, equal diameter, and finishing. During the pulling process, the pulling speed is 1-3mm / h, the rotational spe...

Embodiment 2

[0027] The preparation method of hafnium-iron-manganese triple-doped lithium niobate crystal is to simultaneously dope iron, manganese, hafnium and other metal ions in the lithium niobate crystal, and the specific method is carried out according to the following steps:

[0028] (1) Weigh Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , MnO, HfO 2 , according to 9.38000: 10.000: 0.015625: 0.00234: 0.4500, dry the raw materials at a constant temperature of 150°C for 2 hours, then fully mix them on the mixer for 24 hours, and keep the temperature at 800°C for two hours to make Li 2 CO 3It is fully decomposed and calcined at 1100°C for 2 hours to obtain a polycrystalline powder of hafnium, iron, manganese, and lithium niobate crystals.

[0029] (2) Compact the hafnium-iron-manganese tri-doped lithium niobate polycrystalline powder obtained in step (1), put it into a platinum crucible, and use medium frequency induction to heat until the powder is completely melted....

Embodiment 3

[0032] (1) Weigh Li 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , MnO, HfO 2 , according to 9.40000: 10.000: 0.00850000: 0.003694: 0.6000, dry the raw materials at 200°C for 2 hours at a constant temperature, then fully mix them on a mixer for 24 hours, and keep at a constant temperature of 900°C for two hours to make Li 2 CO 3 It is fully decomposed and calcined at 1100°C for 2 hours to obtain a polycrystalline powder of hafnium, iron, manganese, and lithium niobate crystals.

[0033] (2) Compact the hafnium-iron-manganese tri-doped lithium niobate polycrystalline powder obtained in step (1), put it into a platinum crucible, and use medium frequency induction to heat until the powder is completely melted. Tri-doped lithium niobate crystals were grown along the C-axis direction by the Czochralski method according to processes such as neck pulling, shoulder setting, equal diameter, and finishing. During the pulling process, the pulling speed is 1-3mm / h, the rotational speed is 15-30rp...

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Abstract

The invention provides a lithium niobate crystal doped with hafnium, iron and manganese and a preparation method thereof. The composition of the lithium niobate crystal doped with the hafnium iron and manganese is LiaNbbO3:Fec:Mnd:Hfe, wherein, a is between 0.934360 and 0.945525, b is 1.00000, c is between 0.00156250 and 0.003125, d is between 0.000234700 and 0.0004694, e is between 0.0450000 and 0.0600000, and the idiogenous mixture ratio of [Li] / [Nb] is between 0.934360 and 0.945525. The preparation method comprises the following steps that: Li2CO3, Nb2O5, Fe2O3, MnO and HfO2 are mixed evenly according to a ratio of 9.38000:10.000:0.0078125:0.002347:0.04000 and dried, and the mixture is calcined at a temperature of 1100 DEG C for 2 hours so that a polycrystal powder material is prepared; the polycrystal powder material is heated and melted, the lithium niobate crystal doped with the hafnium, iron, manganese is grown by the Czochralski method through pulling, shouldering, being isometric and ending along a C axis direction, the puling speed is between 1 and 3 millimeters per hour, the rotating speed is between 15 and 30rpm, the gas-liquid difference in temperature is 20 DEG C, the temperature gradient in the fused mass is 1.5 DEG C per millimeter, and the difference in temperature on the upper part of the fused mass is 1 DEG C per millimeter; and the grown crystal is subjected to poling, annealing, polishing and cutting at a temperature of 1200 DEG C so that the lithium niobate crystal doped with the hafnium, iron and manganese used for storing is prepared. The method solves the problems that a three-dimensional holographic memory has long response time and information volatility, increases the response speed, and simultaneously ensures that the information is not wiped off in the information reading process, thereby having great market prospect.

Description

technical field [0001] The invention relates to a lithium niobate crystal in the field of photoelectric crystals and a preparation method thereof, in particular to a photorefractive lithium niobate triple-doped crystal of a photoelectric crystal and a preparation method thereof. Background technique [0002] Three-dimensional holographic memory will eventually replace the current memory and become a new generation of information storage media. However, the biggest problem facing this product at present is that it cannot find suitable storage materials. [0003] Li was proposed in CN1277271 patent 1-x Nb 1+y o 3 :Fe m :M n Double-doped crystal, in which M is one of Mg, Zn, In anti-photorefractive doping elements. In this patent, with the doping of M impurities, the monochromatic holographic storage performance of the crystal can be improved, for example, the anti-light scattering ability can be improved, the light scattering threshold can be lowered, and the response ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 李晓春易学专夏雄鹰王哲周进文石峰王龙生
Owner TAIYUAN UNIV OF TECH
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