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Method for testing constant cadmium and zinc in cadmium zinc telluride crystal

A test method, cadmium zinc telluride technology, applied in the field of chemical analysis, can solve the problems of interfering titration end point observation, inability to perform accurate titration, insensitive end point discoloration, etc., to reduce analysis cost, reduce relative standard deviation, and suppress interference Effect

Active Publication Date: 2015-09-16
清远先导材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many steps, and when the Te content in the CZT single crystal is above 50%, white oxide precipitates will be formed under weak acid conditions, which interferes with the observation of the titration end point, making the end point discoloration insensitive, and accurate titration cannot be performed.

Method used

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  • Method for testing constant cadmium and zinc in cadmium zinc telluride crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Determination of constant cadmium and zinc content in standard samples:

[0042] (1) Accurately weigh 1.1364g of 99.999% cadmium powder, add 20mL of nitric acid (1+1) and heat to dissolve in the conical flask, accurately weigh 1.3336g of 99.999% tellurium powder, add 20mL of nitric acid (1+1 1) Heat and dissolve in the Erlenmeyer flask, accurately weigh 0.6538g of 99.999% zinc flakes, dissolve in the Erlenmeyer flask with a small amount of hydrochloric acid, transfer the dissolved zinc solution together with the cooled cadmium solution and tellurium solution to Add 60mL of concentrated nitric acid to a 1L volumetric flask, dilute to the mark with pure water, and reserve it as the standard solution for CZT synthesis.

[0043](2) Use a pipette to accurately pipette 25mL of CZT-synthesized standard solution into a 250mL Erlenmeyer flask, adjust to near-neutrality with ammonia water (1+1), at this time a large amount of white precipitate is produced, and then add 15mL of am...

Embodiment 2

[0059] Determination of cadmium and zinc content in CZT crystal produced by our company:

[0060] (1) Accurately weigh 0.5g~0.6g (accurate to 0.0001g) of CdZnTe sample in a conical flask, add 10mL of nitric acid (1+1), heat at low temperature until completely dissolved, transfer the solution to a 250mL flask after cooling Add 10mL of nitric acid (1+1) to the volumetric flask, dilute to the mark with pure water and shake well.

[0061] (2) Use a pipette to accurately pipette 25mL of the sample solution, adjust the pH value to near neutrality with ammonia water (1+1), at this time a large amount of white precipitate is produced, then add 15mL ammonia water-ammonium chloride buffer solution to maintain the pH of the solution The value is 10.

[0062] (3) Add 5 mL of polyethylene glycol octyl phenyl ether surfactant with a volume concentration of 20% to the solution. At this time, the white precipitate disappears. Shake well to dissolve it fully, and then add 0.05 g of chrome bla...

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Abstract

The invention provides a method for testing constant cadmium and zinc in cadmium zinc telluride crystal. The method provided by the invention comprises the following steps: taking a solution obtained by dissolving a proper amount of a sample solution of the cadmium zinc telluride crystal to be tested or a proper amount of a solid sample of the cadmium zinc telluride crystal to be tested, adjusting pH value of the solution to neutral by adding ammoniacal liquor (1+1) to and adjusting pH value of the solution to 10 by adding a proper amount of an ammonia-ammonium chloride buffer solution and remaining stable; adding a proper amount of a surfactant into the solution, adding a proper amount of an eriochrome black T indicator, and carrying out complexometric titration by the use of a complexing agent EDTA to turn the solution from purple to pure blue so as to obtain total amount nCd+Zn of cadmium and zinc, wherein molar concentration of the complexing agent EDTA is C1 and the use amount is V1; adding a proper amount of DDTC sodium salt to fully dissolve, selectively precipitate cadmium by DDTC sodium salt and releasing the same amount of EDTA, carrying out titration on EDTA by the use of a magnesium nitrate solution until the solution turns light red so as to obtain cadmium with the amount of nCd and mass of mCd, wherein molar concentration of the magnesium nitrate solution is C2 and use amount is V2; and obtaining zinc with amount of nZn and mass of mZn according to a difference method.

Description

technical field [0001] The invention relates to the field of chemical analysis methods, in particular to a method for testing constant cadmium and zinc in cadmium zinc telluride crystals. Background technique [0002] Cadmium Zinc Telluride (Cd 1-x Zn x Te, abbreviated as CZT) single crystal is a ternary compound semiconductor room temperature nuclear radiation detector material with excellent performance, which is widely used in nuclear safety, environmental monitoring, astrophysics and medical imaging and other fields. At present, the CZT detector has become one of the research hotspots all over the world. The difference of Cd and Zn content in CZT single crystal will significantly affect the performance of CZT single crystal, so the accurate determination of Cd and Zn content in CZT is one of the keys to synthesize CZT single crystal with specific properties. [0003] Common methods for determining the content of cadmium and zinc include disodium ethylenediaminetetraac...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 谢增春万小红朱刘
Owner 清远先导材料有限公司
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