Method for growing La2Ti2O7 single crystals doped with Ta with different concentrations by floating zone method

A floating zone method and single crystal technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problems of short service life of lamps, short service life, tungsten wire is easy to volatilize, etc.

Inactive Publication Date: 2018-04-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The light source used in the early days was light emitted by a carbon arc, but its service life was short. Later, an incandescent lamp was used as a light source, but the tungsten filament of the incandescent lamp is very volatile at high temperature, and the service life of the lamp is still very short.

Method used

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  • Method for growing La2Ti2O7 single crystals doped with Ta with different concentrations by floating zone method
  • Method for growing La2Ti2O7 single crystals doped with Ta with different concentrations by floating zone method
  • Method for growing La2Ti2O7 single crystals doped with Ta with different concentrations by floating zone method

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Experimental program
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Effect test

Embodiment 1

[0047] (1) Ingredients: Ta with a purity of not less than 99.99% 2 o 5 , La 2 o 3 and TiO 2 The powder is formulated according to the stoichiometric ratio of La 2 Ti 2-x Ta x o 7 where x = 0.02;

[0048] (2) Preparation of material rod: ball mill the mixture prepared in step (1) for 24 hours, dry at 100°C for 2 hours, pre-fire at 1350°C for 10 hours, and then grind again, then put the powder into a long balloon and seal it , made into rods under isostatic pressure of 60-70MPa;

[0049] (3) Sintering: Sinter the material rod prepared in step (2) in a high temperature furnace at 1500°C for 12 hours to obtain a dense polycrystalline rod for crystal growth;

[0050] (4) Crystal growth: Hang the feeding rod on the upper end of the optical floating zone furnace with a platinum wire, fix the feeding rod on the seed crystal holder, install it at the lower end, and seal it with a quartz tube after installation; set the heating time to 0.6h to reach With a power output of 1800...

Embodiment 2

[0053] (1) Ingredients: Ta with a purity of not less than 99.99% 2 o 5 , La 2 o 3 and TiO 2 The powder is formulated according to the stoichiometric ratio of La 2 Ti 2-x Ta x o 7 where x = 0.04;

[0054] (2) Preparation of rods: ball mill the mixture prepared in step (1) for 24 hours, dry at 100°C for 2 hours, pre-fire at 1350°C for 20 hours, and then grind again, then put the powder into a long balloon and seal it , made into rods under isostatic pressure of 60-70MPa;

[0055] (3) Sintering: sintering the material rod prepared in step (2) in a high temperature furnace at 1500° C. for 10 h to obtain a dense polycrystalline rod for crystal growth;

[0056] (4) Crystal growth: Hang the feeding rod on the upper end of the optical floating zone furnace with a platinum wire, fix the feeding rod on the seed crystal holder, install it at the lower end, and seal it with a quartz tube after installation; set the heating time to 0.6h to The upper and lower material rods start ...

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Abstract

The invention relates to a method for growing La2Ti2O7 single crystals doped with Ta with different concentrations by a floating zone method. The chemical composition of the Ta doped La2Ti2O7 single crystals is La2Ti2-xTaxO7, wherein 0.01<=x<=0.1, preferably, 0.02<=x<=0.08, and lattice constants include a=7.8109-7.8220 angstrom, b=13.008-13.012 angstrom and c=5.5451-5.5498 angstrom. The La2Ti2-xTaxO7 single crystals have high crystallinity and transmittance.

Description

technical field [0001] The invention relates to the field of crystal growth, in particular to the growth of La 2 Ti 2-x Ta x o 7 single crystal method. Background technique [0002] La 2 Ti 2 o 7 It is a lead-free, environmentally friendly and safe high-temperature piezoelectric ferroelectric material. Its Curie temperature is as high as 1773K. It has excellent piezoelectric, electro-optic and nonlinear optical properties. It is used in aerospace, nuclear energy, metallurgy, petrochemical, geological exploration, etc. In special fields, it is the most potential candidate material for sensors and brakes. La 2 Ti 2 o 7 The single crystal belongs to the layered perovskite structure. When eight unit cells are stacked together, they form La 2 Ti 2 o 7 Layered three-dimensional structure, each layer consists of four TiO 6 Octahedral planar layer structure, TiO 6 The octahedrons are connected together by oxygen, and the La atoms are divided into two types. One type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B13/00C30B29/32
CPCC30B13/00C30B29/32
Inventor 余建定王慧李勤汪超越贺欢李新芳徐家跃
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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