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
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[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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