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A method for characterizing the Curie temperature of barium strontium titanate ceramics based on upconversion luminescence

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

Active Publication Date: 2018-01-30
HARBIN INST OF TECH
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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

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  • A method for characterizing the Curie temperature of barium strontium titanate ceramics based on upconversion luminescence
  • A method for characterizing the Curie temperature of barium strontium titanate ceramics based on upconversion luminescence
  • A method for characterizing the Curie temperature of barium strontium titanate ceramics based on upconversion luminescence

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specific Embodiment approach 1

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

[0019] 1. According to the chemical formula Ba 0.8 Sr 0.2 TiO 3 BaCO 3 , SrCO 3 and TiO 2 The powder is mixed evenly to obtain BST powder, and the rare earth inorganic salt is dissolved in absolute ethanol to obtain a rare earth inorganic salt solution, and then the BST powder and the rare earth inorganic salt solution are added to a ball milling tank for ball milling, and the mixed material after ball milling is passed through After drying, heat preservation at a temperature of 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, sieve, add a binder to granulate twice, then place it in a mold, and dry press the granulated powder at room temperature and under a pressure of 10MPa...

specific Embodiment approach 2

[0028] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the rare earth inorganic salt described in step one 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

A method for characterizing the Curie temperature of barium strontium titanate ceramics based on up-conversion luminescence, the invention belongs to the field of preparation of rare earth-doped barium strontium titanate (BST) ceramics, and it aims to solve the problem of traditional dielectric temperature spectrum characterization of barium strontium titanate ceramics The Curie temperature method has strict requirements on the shape of the barium strontium titanate ceramic sample and the problem of damage to the sample caused by the treatment of the upper electrode. Characterization methods: 1. BaCO3, SrCO3 and TiO2 powders are mixed to prepare BST powder; 2. BST powder is dry-pressed and sintered to obtain BST ceramics; 3. Test the up-conversion luminescence spectra of BST ceramics at different temperatures. Make a curve of the luminous intensity at the luminous wavelength as a function of temperature, and the temperature corresponding to the point with the largest rate of change on the curve is the Curie temperature point. The characterization method based on the up-conversion luminescence of the present invention has no limitation on the shape, surface area and thickness of the test sample, and has high test accuracy.

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 application of up-conversion luminescent materials is mainly in three-dimensional display, anti-Stokes fluorescence cooling, infrared detectors, electron capture materials, infrared anti-counterfeiting, fluorescent marking, temperature sensors and up-conversion lasers, etc., and the up-conversion luminescence performance It is 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 i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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