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Melt method for growing sosoloid monocrystal of lead lead-titanate niobium-zincate

A lead niobate, solid solution technology, applied in the direction of single crystal growth, single crystal growth, crystal growth, etc., can solve the problem of difficulty in obtaining high-quality solid solution single crystals, large changes in the supersaturation of the growth solution, and poor repeatability of the crystal growth process, etc. problems, to achieve the effect of reducing the generation of inclusions, good crystal integrity, and easy control of growth process parameters

Inactive Publication Date: 2002-12-04
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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Problems solved by technology

The growth of relaxation-based ferroelectric single crystals by the flux method has its inherent disadvantages: due to the complexity of the components and the volatility of lead oxide and zinc oxide at high temperatures, the protection requirements for the growth process are extremely strict, and because the oxides The volatilization of the growth solution leads to a large change in the supersaturation of the growth solution and poor repeatability of the crystal growth process; it is difficult to control the spontaneous nucleation during the crystal growth process, and it is easy to generate inclusions, making it difficult to obtain high-quality, large-size solid solution single crystals; the production efficiency is low , crystal growth is difficult to achieve large-scale [K.Harada, Y.Hosono, S.Saitoh and Y.Yamashita, Jpn.J.Appl.Phys., 39(2000) 3117-3120]
Unfortunately, so far there are no publications publicly reporting the growth of lead niobate zincate lead titanate solid solution single crystals by the melt method

Method used

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  • Melt method for growing sosoloid monocrystal of lead lead-titanate niobium-zincate
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  • Melt method for growing sosoloid monocrystal of lead lead-titanate niobium-zincate

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Embodiment 1

[0029] Obtain the raw material of crystal growth with B position presynthesis method, and growth raw material is according to chemical formula (1-x)Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 X=0.09 ratio. High-purity zinc oxide, niobium pentoxide and titanium dioxide powder are mixed evenly by wet ball milling. The obtained powder is dried and placed in a covered platinum crucible for heat treatment at 950°C for 1.5 hours. The main ingredient is ferroniobium Ore structure zinc niobate (ZnNb 2 o 6 ). The above-mentioned powder is added with lead oxide in a metered ratio, mixed evenly by wet ball milling, the obtained powder is dried, placed in a covered platinum firing crucible, and heat-treated at 750°C for 1.5 hours. The main component of the obtained pretreated raw material is perovskite structure lead niobate zincate lead titanate solid solution 0.91Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -0.09PbTiO 3 . Press the above-mentioned powder into blocks by cold isostatic pressing. However, the m...

Embodiment 2

[0031] X = 0.15, first configure zinc niobate whose main component is niobite structure, treat at 980°C for 1.2 hours, then add PbO, treat at 700°C for 2 hours, then grow along the (110) plane, with a temperature gradient of 60°C / cm, the temperature of the growth furnace was controlled at 1400°C, and the cooling rate was 10°C / h, and the rest were the same as in Example 1.

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Abstract

A melt method for growing the sosoloid monocrystal of lead lead-titanate niobium-zincate, (1-x)Pb(Zn1 / 3Nb2 / 3)O3-xPbTiO3 where x=0.05-0.2, features that the raw material is pretreated by two steps andther PZNT monocrystal is grown by heterosyntectonic crucible lowering method, where PMNT sosoloid monocrystal is used as seed, temp is 1380-1420 deg.C, the temp gradient at growth interface is 40-80 deg.C and lowering speed is 0.5-1 mm / hr.

Description

technical field [0001] The invention relates to a method for growing a relaxor-based ferroelectric single crystal lead niobate zincate lead titanate (PZNT) solid solution single crystal, more precisely, it relates to growing (preparing) a relaxor-based ferroelectric PZNT single crystal by a crucible descent method. crystal. Among them, the chemical composition of the crystal can be expressed as (1-x)Pb(Zn 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 , abbreviated as PZNT or PZN-PT. It belongs to the field of crystal growth. Background technique [0002] Lead niobate zincate lead titanate solid solution is a relaxation-based ferroelectric material. There is a quasi-isomorphic phase boundary in the solid solution. Near the quasi-isomorphic phase boundary, the lead niobate zincate lead titanate solid solution single crystal has good piezoelectric properties and a large dielectric constant, and its comprehensive performance is much higher than that of current applications. The lead zirconat...

Claims

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Application Information

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IPC IPC(8): C30B15/00C30B29/22
Inventor 罗豪甦方必军徐海清贺天厚
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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