Sample for temp. calibration of thermogravimeter and preparing method thereof

A technology of thermogravimetric analyzer and standard sample, which is applied in thermal analysis of materials, analysis materials, instruments, etc., can solve the problems of lack, resistance to acid and alkali corrosion, and poor precision, etc., and achieve sensitive response, low price, and high technology easy effect

Inactive Publication Date: 2005-04-20
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The defects of the standard samples in Germany and the United States mainly include the following points: first, there is a lack of standard samples near room temperature; second, metal standard samples are prone to rust and corrosion in an environment with high humidity; is the accuracy is not very good

Method used

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  • Sample for temp. calibration of thermogravimeter and preparing method thereof
  • Sample for temp. calibration of thermogravimeter and preparing method thereof
  • Sample for temp. calibration of thermogravimeter and preparing method thereof

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Embodiment Construction

[0025] to La 0.8 Sr 0.2 MnO 3 Standard sample is taken as an example, its component weight percentage is

[0026] La 47.98;

[0027] Sr 7.57;

[0028] Mn 23.72;

[0029] O 20.73.

[0030] Its preparation method is: used chemical reagent mainly contains: La 2 o 3 , Sr(CH 3 COO) 2 ·H 2 O, Mn(CH 3 COO) 2 4H 2 O, concentrated HNO 3 , citric acid, weigh the above-mentioned compound according to the molar ratio of La:Sr:Mn=8:2:10. The main steps are as follows: Weigh a certain dose of La 2 o 3 Soluble in appropriate amount of HNO 3 To obtain a colorless transparent solution, weigh Mn(CH 3 COO) 2 4H 2 O was dissolved in an appropriate amount of water to form a colorless and transparent solution, and the Sr(CH 3 COO) 2 ·H 2 O dissolves in H 2 O into a colorless and transparent solution, and then the above three solutions were mixed, and then a certain dose of citric acid was added to the mixed solution as a peptizer, magnetically stirred for 3 h...

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Abstract

The invention relates to a standard sample used for temperature calibration of a thermogravimetric analyzer and a preparation method thereof, in particular to a sol-gel method for preparing a standard sample product for temperature calibration of a thermogravimetric analyzer. We aim at the current situation that the standard samples of domestic thermal analyzers come from two foreign companies and the current shortcomings of the standard products of these two companies, that is, they are not resistant to acid and alkali corrosion, low precision, easy to rust in humid environments, and lack of room temperature. Based on the characteristics of nearby standard samples, the lanthanide rare earth manganese oxides with giant magnetoresistance effect were used as raw materials to prepare magnetic oxide ceramics for temperature calibration of thermogravimetric analyzers. The product consists of two samples, one sample has a Curie temperature of 29°C, so its calibration temperature is 29°C, and the other has a Curie temperature of 90.4°C, and its calibration temperature is 90.4°C. The product has the advantages of high precision, acid and alkali corrosion resistance, humidity resistance, simple preparation process, cheap price and convenient use.

Description

technical field [0001] The invention relates to a standard sample used for temperature calibration of a thermogravimetric analyzer and a preparation method thereof. Specifically, it relates to a standard sample product for preparing a calibration temperature of a thermogravimetric analyzer by using a sol-gel method, and belongs to the field of standard substances . Background technique [0002] Thermogravimetric analyzer is the most commonly used thermal analysis instrument. It is quantitative and can be widely used in physics, chemistry, materials and other fields. It can be said that as long as the weight of a substance changes when it is heated, it can be studied by thermogravimetry. its changing process. When using a thermogravimetric analysis (TG) instrument for testing, temperature calibration is very important. At present, there are three methods for calibrating the temperature: one is to use a standard material that can indicate the temperature and have a reproducib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50G01N5/00G01N25/00
Inventor 林木良尹荔松林国淙张进修
Owner SUN YAT SEN UNIV
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