Indium cerium iron triple-doped lithium niobate crystal and preparation method thereof

A technology of lithium niobate and cerium iron, which is applied in the field of lithium niobate crystal and its preparation, can solve the problems of poor resistance to light damage, high doping threshold concentration, and long response time, and achieve easy growth and low doping threshold , The effect of improving the ability to resist light damage

Inactive Publication Date: 2010-07-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better properties such as lower dopings thresholds, higher capacity at room temperature without losing its effectiveness over longer periods due to changes caused during manufacturing or use that can affect it's ability to store data accurately. It also improves resistive against damage from sunlight exposure while still being able to achieve good optical quality (volume).

Problems solved by technology

This patented technical problem addressed by our study relates to improving the efficiency at storing data on LCD displays without causing damage or degraded image quality caused due to exposure during writing/writing cycles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The specific steps of this embodiment include:

[0019] 1) Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , CeO 2 and In 2 o 3 As the basic raw material, the molar ratio of Li and Nb is 0.94, Fe 2 o 3 The doping concentration is 0.01wt%, CeO 2 The doping concentration is 0.1mol%, In 2 o 3 The doping concentration is 0.5mol%. Dry the powder at a constant temperature of 200°C for 3 hours, fully mix it on a mixer for 12 hours, put the mixed raw materials into a Pt crucible, and sinter them in an environment of 750°C for 2 hours to make Li 2 CO 3 Fully decompose, then heat up to 1000°C and sinter for 2 hours to obtain polycrystalline powder.

[0020] 2) Heating with a medium-frequency induction furnace, adopting the traditional pulling method for crystal growth, in which the key growth parameters are: pulling speed of 3mm / h, rotation speed of 12rpm, gas-liquid temperature difference of 30°C, and temperature gradient of 2°C / h in the solution mm, grow...

Embodiment 2

[0026] The specific steps of this embodiment are the same as those in Embodiment 1, except that the specific steps include:

[0027] 1) Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe 2 o 3 , CeO 2 and In 2 o 3 As the basic raw material, the molar ratio of Li and Nb is 1.05, Fe 2 o 3 The doping concentration is 0.02wt%, CeO 2 The doping concentration is 0.2mol%, In 2 o 3 The doping concentration is 1.0mol%. Dry the powder at a constant temperature of 300°C for 3 hours, fully mix it on a mixer for 12 hours, put the mixed raw materials into a Pt crucible, and sinter them in an environment of 750°C for 2 hours to make Li 2 CO 3 Fully decompose, then heat up to 1050°C and sinter for 2 hours to obtain polycrystalline powder.

[0028] 2) Heating with a medium-frequency induction furnace, adopting the traditional pulling method for crystal growth, in which the key growth parameters are: pulling speed of 2mm / h, rotation speed of 15rpm, gas-liquid temperature differenc...

Embodiment 3

[0032] The specific steps of this embodiment are the same as those in Embodiment 1, except that the specific steps include:

[0033] 1) Li with a purity of 99.99% 2 CO 3 , Nb 2 o 5 , Fe2 o 3 , CeO 2 and In 2 o 3 As the basic raw material, the molar ratio of Li and Nb is 1.2, Fe 2 o 3 The doping concentration is 0.03wt%, CeO 2 The doping concentration is 0.3mol%, In 2 o 3 The doping concentration is 1.4mol%. Dry the powder at a constant temperature of 300°C for 3 hours, fully mix it on a mixer for 12 hours, put the mixed raw materials into a Pt crucible, and sinter them in an environment of 750°C for 3 hours to make Li 2 CO 3 Fully decompose, then heat up to 1050°C and sinter for 3 hours to obtain polycrystalline powder.

[0034] 2) Heating with a medium-frequency induction furnace, adopting the traditional pulling method for crystal growth, in which the key growth parameters are: pulling speed 1mm / h, rotation speed 20rpm, gas-liquid temperature difference 25°C, t...

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PUM

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Abstract

The invention provides an indium cerium iron triple-doped lithium niobate crystal and a preparation method thereof, belonging to the non-linear optical crystal field. The crystal is prepared by Li2CO3, Nb2O5, Fe2O3, CeO2 and In2O3 with purity of 99.99 percent; the preparation method comprises steps of: 1) weighing the powder according to certain proportion, fully mixing and then sintering the powder; 2) heating the powder by an intermediate frequency furnace, and adopting a pulling method to develop the indium cerium iron triple-doped lithium niobate crystal according to procedures of seeding, necking, shouldering, back shouldering, growing with a constant diameter, pulling and separating and annealing; 3) testing the crystal through two-wave coupling; and 4) testing the crystal through a direct transmission light spot distortion method. The invention comprehensively employs two means of light-resistant damage element doping and stoichiometric ratio growth, and obvious improves the photo damage resistance and the response time of the lithium niobate crystal on the basis of maintaining the original excellent performances of the lithium niobate crystal, and the invention will greatly promote the application of the lithium niobate crystal material in the three-dimensional body holographic storage field, and has broad market prospect.

Description

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Claims

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Application Information

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Owner YANSHAN UNIV
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