Unlock instant, AI-driven research and patent intelligence for your innovation.

Non-contact method for measuring Curie temperature of ferroelectrics by fluorescence

A technology for fluorescence measurement and Curie temperature, applied in thermometers, measuring devices, measuring heat, etc., can solve problems such as temperature difficulties, and achieve the effects of simple and convenient operation, control of the measurement process, and easy measurement process

Active Publication Date: 2017-05-31
NINGBO UNIV
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process adopts the contact method and needs to be covered with metal electrodes. It is difficult to monitor the temperature of ferroelectric ceramics when they are used.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Non-contact method for measuring Curie temperature of ferroelectrics by fluorescence
  • Non-contact method for measuring Curie temperature of ferroelectrics by fluorescence
  • Non-contact method for measuring Curie temperature of ferroelectrics by fluorescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1, utilizing high-purity BaCO 3 , TiO 2 ,Er 2 o 3 , Yb 2 o 3 BaTi was prepared at 1350-1450°C using traditional ceramic preparation techniques (1-x-y) Er x Yb y o 3 (0.01≤x≤0.035; y=0.005,0.01) ceramics.

[0023] figure 1 For several typical BaTi (1-x-y) Er x Yb y o 3 (x=0, y=0; x=0.005, y=0.005; x=0.01, y=0.005; x=0.01, y=0.01; x=0.015, y=0.01) X-ray diffraction patterns of ceramics. Added rare earth Yb 3+ Ions mainly play a sensitizing role. It can be seen from the figure that the prepared ceramic is a pure perovskite structure, and the ceramic is a tetragonal phase structure.

[0024] figure 2 It is the visible fluorescence spectrum emitted by the four ceramic components under 980nm laser excitation. The two green emission peaks at 525nm and 545nm are due to 2 h 11 / 2 → 4 I 15 / 2 and 4 S 3 / 2 → 4 I 15 / 2 caused by the conversion. The intense red emission between 600-700nm is due to 4 f 9 / 2 → 4 I 15 / 2 caused by the transition.

...

Embodiment 2

[0026] Embodiment 2, adopt high-purity MgO, Nb 2 o 5 and Er 2 o 3 , Nb 2 o 5 After fully mixing, sinter at 1100°C for 2 hours to synthesize MgNb 2 o 6 and ErNbO 4 powder, then weigh the TiO according to the stoichiometric ratio 2 , PbO and synthesized MgNb 2 o 6 , ErNbO 4 Powder synthesis of (0.97-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 -0.03Pb(Er 1 / 2 Nb 1 / 2 )O 3 (0.15≤x≤0.40) powder, then use the prepared (0.97-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 -0.03Pb(Er 1 / 2 Nb 1 / 2 )O 3 Powder, ball milling, granulation and tablet molding, and finally sintering at 1200°C for 2 hours. The sintered ceramic is (0.97-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 -0.03Pb(Er 1 / 2 Nb 1 / 2 )O 3 ferroelectric ceramics.

[0027] Figure 5 is (0.97-x)Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -xPbTiO 3 -0.03Pb(Er 1 / 2 Nb 1 / 2 )O 3 (x=0.15,0.20,0.25,0.30,0.35,0.40) X-ray diffraction spectrum of ceramics, it can be seen from the figure that the prepared ceramics is a pure perovskite structure, and when x=0....

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

A non-contact method for measuring the Curie temperature of a ferroelectric by using fluorescence, characterized in that the ferroelectric synthesis stage uses Er3+ oxides as additives, and Er3+ is used to occupy the B position of the ABO3 perovskite structure during the batching , the A site is at least one of Ba2+, Pb2+, K+, and Na1+, and the B site is at least one of Mg2+, Nb5+, Ni2+, Zn2+, and Ti4+; using 980nm laser excitation to excite Er3+ rare earth ion upconversion green and red fluorescence , the fiber optic spectrometer tested the up-conversion fluorescence of Er3+ rare earth ions, and then used the rare earth ions to do Er doping on the ferroelectric at different temperatures, and finally monitored the ferroelectric by the ratio of the intensity of red light to the intensity of green light or the derivative of the ratio. Variations in the Curie temperature of the body. Compared with the prior art, the present invention has the advantages that: the present invention adopts a non-contact method, and the operation is simple and convenient, the overall measurement cost is low, and the temperature of the ferroelectric body can be monitored, and the measurement process can be easily controlled.

Description

technical field [0001] The invention relates to a method for measuring the Curie temperature of a ferroelectric body. Background technique [0002] Ferroelectric ceramics are widely used functional ceramic materials, widely used in ultrasonic motors, ultrasonic cleaning machines, sonar, piezoelectric lighters, piezoelectric transformers, filters and other devices. High voltage polarized ferroelectrics have high piezoelectricity. An important feature of ferroelectrics is that they have a Curie temperature. When the temperature exceeds the Curie temperature, the ferroelectricity disappears and transforms into a paraelectric phase, and the corresponding piezoelectricity also disappears. [0003] Recently, ferroelectric materials doped with rare earth elements are used to prepare more and more applications and researches on up-conversion luminescent materials. For related documents, please refer to the Chinese invention patent "praseodymium-doped calcium titanate luminescent po...

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 Patents(China)
IPC IPC(8): G01K11/32C04B35/468C04B35/499
Inventor 罗来慧姚永杰左强辉李伟平
Owner NINGBO UNIV