An infinitely mixable and meltable ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate and a preparing method thereof

A lead scandium niobate and lead magnesium niobate technology, applied in the field of crystal technology and functional crystallography, can solve the problems of high melting point, difficult to grow single crystal, difficult crystallization, etc., and achieve good research value, high Curie temperature, excellent pressure and so on. The effect of electrical properties

Active Publication Date: 2017-05-10
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PSN-PT crystal growth is currently facing great difficulties, the material has a high melting point (T m >1425℃), there are higher requirements for crystal growth devices and crucibl

Method used

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  • An infinitely mixable and meltable ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate and a preparing method thereof
  • An infinitely mixable and meltable ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate and a preparing method thereof
  • An infinitely mixable and meltable ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate and a preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Adopt top seed method to grow PSN-PMN-PT crystal, the chemical formula of described crystal is:

[0036] (1-x-y)Pb(Sc 1 / 2 Nb 1 / 2 )O 3 -yPb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 , wherein, x=0.4~0.6, y=0.1~0.4, 0.1<1-x-y<0.4.

[0037] Prepare the seeds:

[0038] (a) batching, weigh PbO, Sc by the stoichiometric ratio of above-mentioned chemical formula 2 o 3 , Nb 2 o 5 、TiO 2 and B 2 o 3 Raw materials are mixed, ground and loaded into platinum crucibles.

[0039] (b) Tie the seed crystal, and tie the platinum wire to one end of the seed crystal rod.

[0040] (c) Install the furnace, put the crucible into the molten salt furnace, fix the seed crystal rod on the furnace frame, adjust the center to ensure that the centers of the furnace, crucible and seed crystal are on a straight line, and cover the furnace cover.

[0041] (d) Growth, set the temperature control program, raise the temperature to 1060°C, keep the temperature for 2 days, place the platin...

Embodiment 2

[0049] Example 2: Determination of the crystal structure.

[0050] Using X-ray powder diffraction, the structure of the crystals was determined. The instrument used is a Japanese RIGAKU-DMAX2500 powder diffractometer (Cu target, λ=0.154056nm, graphite monochromator), the specific test conditions are at room temperature, the measurement angle range is 10-80°, and the step size adopted is 0.02° (2θ ), time 2s / step. The obtained powder diffraction results are as follows figure 2 shown.

[0051] From figure 2 It can be seen that PSN-PMN-PT crystals all have a pure perovskite structure, and with the increase of PT content, there is a transition from trigonal to MPB to tetragonal.

Embodiment 3

[0052] Example 3: Measurement of electrical properties of crystals.

[0053] Parts cut from the bulk crystal along the (001) direction were ground, polished, and coated with silver paste on both sides for the measurement of electrical properties.

[0054] Dielectric measurement: the instrument used is an alpha dielectric / impedance high-resolution analyzer (Novolcontrol, German), with a temperature range of -50 to 400°C, a frequency range of 1 to 1kHz, and a small signal test voltage of 1Vrms.

[0055] Ferroelectric measurement: the instrument used is TF 2000 standard ferroelectric measurement system, the temperature condition is room temperature, and the frequency used is 2Hz.

[0056] Piezoelectricity measurement: the instrument used is the ZJ-4AN quasi-static d 33 Measuring instrument, the test condition is room temperature.

[0057] Specific measurement results such as image 3 and Figure 4 shown.

[0058] From image 3 It can be seen that the PSN-PMN-PT crystal exhi...

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Abstract

The invention relates to ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate and a preparing method thereof. A top seed crystal growth process is adopted to perform growth. The process is simple, and the prepared crystal has excellent performance. The ferroelectric solid solution monocrystalline lead scandium niobate-lead magnesium niobate-lead titanate has excellent piezoelectric performance and a high Curie temperature, can meet requirements of medicine and military application having very high requirements on material stability, and has good research and application value.

Description

technical field [0001] The invention relates to a crystal material, in particular to a ternary ferroelectric solid solution crystal material. Specifically, the present invention relates to ferroelectric solid solution single crystal (1-x-y)Pb(Sc 1 / 2 Nb 1 / 2 )O 3 -yPb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 (0<x<1, 0<y<1, 0<1-x-y<1), and its growth process, structure and electrical properties, belong to the field of crystal technology and functional crystallography. Background technique [0002] Lead-based perovskite structure solid solution, especially the solid solution material with lead titanate as an end member component, due to its excellent piezoelectric properties, is widely used in electromechanical coupling fields such as seabed detection, seabed identification, ultrasonic imaging, sensing and Micromechanical systems have extensive and important applications, especially in national defense construction. A Novel Relaxor Ferroelectric Single Crystal (1-x...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B11/00
CPCC30B11/00C30B29/22
Inventor 龙西法王祖建李修芝何超刘颖
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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