Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Making method for iron-doped lithium tantalum crystal

A manufacturing method and technology of lithium iron tantalate, applied in the directions of crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the problems of unfavorable SAW device fabrication, low substrate light absorption, etc., and reduce transgranular cleavage. Cracking phenomenon, the effect of reducing reflection problems

Inactive Publication Date: 2016-12-07
TDG HLDG CO LTD
View PDF4 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the lighter the color, the smaller the light absorption of the substrate and the more reflection on the bottom surface, which is not conducive to the production of SAW devices

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] Synthesis of raw materials. The raw material is lithium carbonate (Li carbonate) with a purity higher than 99.99%. 2 CO 3 ), Fe 2 o 3 , tantalum oxide (Ta 2 o 5 ), put it in an oven and dry it at 100℃~150℃ for 1h. After drying the raw materials, first weigh Fe according to the planned doping amount of 0.1wt% ~ 0.15wt 2 o 3 , and calculate the number of moles. Then weigh lithium carbonate and tantalum oxide to achieve [Li 2 CO 3 +Fe 2 o 3 ]:[ Ta 2 o 5 ]=48.75%:51.25%. The weighed raw materials were manually mixed and put into a special mixer for 24 hours. The mixed raw materials are put into a special mold and compacted into a cake on a press. Put the cake materials on the platinum tray and put them into the sintering furnace together. The sintering procedure is as follows: heat up to 630°C in 3 hours, keep the temperature at 630°C~700°C for 1h~3h, keep the temperature at 800°C~1000°C for 10h~15h, and keep the temperature at 1000°C~ Keep the temperature ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a making method for an iron-doped lithium tantalum crystal. High-purity Ta2O5 and Li2CO3 are doped with 0.1-0.15 wt% Fe2O3, the raw materials are subjected to procedures of baking dehumidification, premixing, briquetting, high-temperature sintering and the like, then, the raw materials are put into an iridium crucible of a crystal growth furnace, and under the protective atmosphere, by means of czochralski method for crystal growing, the large size (3-6 inches) lithium tantalum crystal grows. According to the lithium tantalum crystal, by means of doping of Fe3+, polycrystalline producing in the crystal growing shoulder expanding process and isometrical later period is reduced, the quality of the crystal is effectively improved, the photorefraction performance, impact toughness and an optical absorption coefficient are improved, the crystal is more applicable to make a surface acoustic wave (SAW) filter and can completely replace a non-doped lithium tantalum crystal, and in application to the SAW filter, the iron-doped lithium tantalum crystal has important production improvement significance and market prospects.

Description

technical field [0001] The invention relates to a method for manufacturing a piezoelectric crystal, in particular to a method for manufacturing an iron-doped lithium tantalate crystal. The material is used to make a surface acoustic wave filter (SAW), and can improve photorefractive properties, impact toughness, Light absorption coefficient, so as to achieve the purpose of cost reduction and yield improvement. Background technique [0002] In recent years, due to the widespread use of high-band and multi-band communications in wireless communications represented by mobile phones, the demand for surface acoustic wave filters (SAW) has increased significantly, and its quality requirements are also higher. In the use of its substrate material, the commonly used lithium niobate (LN) single crystal and lithium tantalate (LT) crystal have the advantages of small temperature coefficient of frequency constant, high reliability and repeatability, and large ultraviolet absorption rang...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/30C30B15/00C30B33/02C30B33/04
CPCC30B29/30C30B15/00C30B33/02C30B33/04
Inventor 徐秋峰张寒贫张忠伟张伟明张鸿陈晓强陈超
Owner TDG HLDG CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com