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Tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by flux method and application

A crystal growth and crystal technology, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problems of easy solubility in acid, poor stability, high surface acoustic wave velocity, low delay temperature coefficient, etc., and achieve convenient industrial application. , cheap and easy to operate

Active Publication Date: 2011-04-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium tetraborate has a low delay temperature coefficient, temperature stability can be compared with quartz, electromechanical coupling coefficient is 7 times that of quartz, and surface acoustic wave rate is high. It is ideal for preparing narrowband bandpass surface acoustic wave filters, resonators and high frequency Ideal material for bulk wave devices, but it is easily soluble in acid, deliquescent, and poor in stability
So far, except for the yellow polycrystals obtained by hydrothermal method and solid-state reaction method in the above reports, there are no reports on the growth, property testing and application of cesium tellurium molybdate crystals at home and abroad.

Method used

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  • Tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by flux method and application
  • Tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by flux method and application
  • Tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by flux method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Cs 2 CO 3 , TeO 2 and MoO 3 According to the stoichiometric ratio, synthesize polycrystalline cesium tellurium molybdate, and add it to the flux system TeO 2 -MoO 3 (TeO 2 : MoO 3 =2:1), the molar ratio of polycrystalline CTM to flux is 1:2, put it into a platinum crucible with a volume of Φ80mm×80mm, heat up to 550°C to melt and mix the raw materials evenly; Lower the temperature to 460°C and let it crystallize spontaneously, you can get the following figure 1 Shown polycrystal, its powder X-ray diffraction figure is consistent with standard card (JCPDS, 89-5442), and what explanation obtains is the cesium molybdate tellurium crystal of hexagonal system, and the small crystal that takes out therefrom is used as seed crystal for growing relatively Crystals of large size.

[0051] Irradiate the finely ground cesium tellurium molybdate polycrystal with infrared laser with a wavelength of 1064nm generated by Nd:YAG, and produce strong green light, indicating that i...

Embodiment 2

[0053] Cs 2 CO 3 , TeO 2 and MoO 3 According to the stoichiometric ratio, synthesize polycrystalline cesium tellurium molybdate, and add it to the flux system TeO 2 -MoO 3 (TeO 2 : MoO 3 =2:1), the molar ratio of polycrystalline CTM and flux is 1:2, put it into a platinum crucible with a volume of Φ80mm×80mm, heat up to 550°C to melt the raw materials and mix them evenly; then cool down to the saturation point of the solution , at this time, the preheated seed crystal (taken from Example 1) is lowered into the solution, and the crystal rotation parameters are set as: rotating speed 5-50 rd, acceleration 1-10 s, operation 30-180 s, intermittent 5-50 s, and Cool down to 460°C at a rate of 0.01~3°C / h, and the growth cycle is 30 days, and then a light yellow block single crystal ( figure 2 ), its powder X-ray diffraction pattern is consistent with the standard card (JCPDS, 89-5442), indicating that what is obtained is a cesium tellurium molybdate crystal of the hexagonal s...

Embodiment 3

[0057] Cs 2 CO 3 , TeO 2 and MoO 3 According to the stoichiometric ratio, synthesize polycrystalline cesium tellurium molybdate, and add it to the flux system TeO 2 -MoO 3 (TeO 2 : MoO 3 =0.25:1), the molar ratio of polycrystalline CTM and flux is 1:2, put it into a platinum crucible with a volume of Φ80mm×80mm, heat up to 550°C to melt the raw materials and mix them evenly; then cool down to the saturation point of the solution At this time, put the preheated seed crystal into the solution, and set the crystal rotation parameters as follows: rotation speed 5-50 rd, acceleration 1-10 s, operation 30-180 s, intermittent 5-50 s, and 0.01-5 ℃ / h The temperature was lowered to 460°C, and the growth period was 60 days to obtain a light yellow block single crystal ( image 3 ), its powder X-ray diffraction pattern is consistent with the standard card (JCPDS, 89-5442), indicating that what is obtained is a cesium tellurium molybdate crystal of the hexagonal system.

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Abstract

The invention relates to a tellurium-caesium molybdate crystal, growth of tellurium-caesium molybdate crystal by a flux method and application. The tellurium-caesium molybdate crystal belongs to a hexagonal crystal system, the space group is P63, and the crystal has penetrability within the wavelength range of 430-5380nm; the piezoelectric coefficient at room temperature is as follows: d33=20.5pC / N; and infrared laser with the wavelength of 1064nm generated by a Nd:YAG laser irradiates the crystal to generate strong green light. In the invention, crystal growth is realized by the flux method to finally obtain the large-sized monocrystal; and the obtained crystal is used for manufacturing a piezoelectric device and can be also taken as a nonlinear optical crystal, a ferroelectric crystal, a pyroelectric crystal and a laser host crystal.

Description

technical field [0001] The invention relates to a novel piezoelectric crystal and its growth and application, in particular to cesium molybdate tellurium crystal, growth method and application, and belongs to the technical field of crystal materials. Background technique [0002] The piezoelectric effect was developed by the Curie brothers in 1880 on α-SiO 2 It was first discovered on the crystal, and it reflects the mutual coupling between the elastic properties and the dielectric properties of piezoelectric crystals. When some dielectric crystals are deformed under the action of external force, different charges will be generated on some of its corresponding surfaces. This phenomenon that there is no electric field and only electric polarization due to deformation is positive piezoelectricity. effect. Due to the mutual conversion of mechanical properties and electrical properties, piezoelectric materials are used to make piezoelectric devices such as piezoelectric oscill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B9/12
Inventor 陶绪堂张俊杰孙友轩张承乾蒋民华
Owner SHANDONG UNIV
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