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Method for characterizing Curie temperature of barium strontium titanate ceramic based on up-conversion luminescence

A technology of Curie temperature and barium strontium titanate, which is applied in the field of preparation of rare earth-doped barium strontium titanate ceramics, can solve problems such as sample damage and strict shape requirements, and achieve good stability, high test accuracy, and phonon The effect of low energy

Active Publication Date: 2015-09-16
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the traditional method for characterizing the Curie temperature of barium strontium titanate ceramics by dielectric thermometry has strict requirements on the shape of barium strontium titanate ceramics samples and the problem that the treatment of the upper electrode causes damage to the samples, and provides a method based on the above A method for characterizing the Curie temperature of barium strontium titanate ceramics by converted luminescence

Method used

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  • Method for characterizing Curie temperature of barium strontium titanate ceramic based on up-conversion luminescence

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specific Embodiment approach 1

[0018] Embodiment 1: The method for characterizing the Curie temperature of barium strontium titanate ceramics based on up-conversion luminescence in this embodiment is implemented according to the following steps:

[0019] 1. According to the chemical formula Ba 0.8 Sr 0.2 TiO 3 Put BaCO 3 , SrCO 3 and TiO 2 The powders are mixed evenly to obtain BST powder, the rare earth inorganic salt is dissolved in anhydrous ethanol to obtain a rare earth inorganic salt solution, and then the BST powder and the rare earth inorganic salt solution are added to the ball milling tank for ball milling, and the mixture after ball milling is subjected to After drying, the temperature is kept at 1100-1300° C. for 4-6 hours to obtain rare earth doped BST powder;

[0020] 2. Grind the rare earth-doped BST powder obtained in step 1, add a binder to granulate twice after sieving, and then place it in a mold to dry-press the granulated powder at room temperature and under a pressure of 10 MPa T...

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the rare earth inorganic salt described in Step 1 is Er(NO3 ) 3 ·6H 2 O, Yb(NO 3 ) 3 ·6H 2 O or Tm(NO 3 ) 3 ·6H 2 One or a mixture of O. Other steps and parameters are the same as those in Embodiment 1.

[0029] This embodiment Er 3+ The doping concentration of ions is 0.5% ~ 7% mol, Yb 3+ The doping concentration of ions is 2% ~ 15% mol, Tm 3+ The doping concentration of ions is 0.2%-0.8% mol.

specific Embodiment approach 3

[0030] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in step 1, BST powder and rare earth inorganic salt solution are added to a ball mill tank and ball milled at a speed of 300-400 r / min for 5-7 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for characterizing the Curie temperature of barium strontium titanate ceramic based on up-conversion luminescence, and belongs to the field of preparation of rare-earth doped barium strontium titanate (BST) ceramic, and the method is used for solving the problems of a traditional method for characterizing the Curie temperature of the barium strontium titanate ceramic by a dielectric temperature spectrum table that the requirements on the appearance are strict and damages on a sample are caused by upper electrode treatment. The characterizing method comprises the following steps: 1, mixing BaCO3, SrCO3 and TiO2 powder to prepare BST powder; 2, dryly pressing and molding the BST powder and carrying out sintering treatment to obtain BST ceramic; and 3, testing light spectrums of the up-conversion luminescence of the BST ceramic under different temperatures and drawing a change curve of the luminescence intensity of a luminescence wavelength along the temperature, wherein the temprature of the point with the greatest change rate on the curve is a Curie temperature point. The characterizing method based on the up-conversion luminescence has no limitation on the appearance, surface area and thickness of the test sample, and the testing accuracy is high.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth-doped barium strontium titanate (BST) ceramics, in particular to a method for characterizing the Curie temperature of barium strontium titanate ceramics based on up-conversion luminescence. Background technique [0002] At present, the applications of up-conversion luminescent materials are mainly in three-dimensional stereoscopic display, anti-Stokes fluorescence refrigeration, infrared detectors, electron capture materials, infrared anti-counterfeiting, fluorescent labels, temperature sensors and up-conversion lasers. Affected by many factors, mainly including the type and concentration of rare earth elements, the intensity of the excitation light source, the properties of the matrix material, and the external temperature. Although the host material itself will not be excited to emit light, it can provide a suitable crystal field for the activated ions, so that it can better perform up-c...

Claims

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Application Information

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IPC IPC(8): G01N21/63
Inventor 孙秋潘云星宋英陈向群刘志锴
Owner HARBIN INST OF TECH
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