Test method for constant cadmium and zinc in cadmium zinc telluride crystal

A test method and technology of cadmium zinc telluride, applied in the field of chemical analysis, can solve the problems of inability to perform accurate titration, interfere with the observation of the end point of titration, and insensitivity to the color change of the end point, so as to reduce the analysis cost, reduce the relative standard deviation, and suppress the interference. Effect

Active Publication Date: 2017-12-01
清远先导材料有限公司
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  • Claims
  • Application Information

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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.

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  • Test method for constant cadmium and zinc in cadmium zinc telluride crystal

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Experimental program
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Embodiment 1

[0041] Determination of the content of constant cadmium and zinc 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 0.6538g99.999% 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 o...

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 crystals. The steps include: taking an appropriate amount of cadmium zinc telluride crystal sample solution or a solution obtained by dissolving an appropriate amount of cadmium zinc telluride crystal solid sample to be measured, adding ammonia water (1+1) to adjust the pH value of the solution to neutral, and then adding an appropriate amount of ammonia water ‑Ammonium chloride buffer solution to adjust the pH value of the solution to 10 and keep it stable; add an appropriate amount of surfactant to the solution, then add an appropriate amount of chrome black T indicator, and then use the complexing agent EDTA complexation titration to make the solution change from purple to Pure blue, the molar concentration of the complexing agent EDTA is C1, the dosage is V1, and the total amount of cadmium and zinc is nCd+Zn; add an appropriate amount of DDTC sodium salt to fully dissolve it, and DDTC sodium salt selectively precipitates cadmium And release an equal amount of EDTA, titrate EDTA with magnesium nitrate solution until the solution becomes light red, the molar concentration of magnesium nitrate solution is C2, and the dosage is V2, the amount nCd and quality mCd of cadmium are obtained; Quantity nZn and mass mZn of zinc substance.

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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Patent Type & Authority Patents(China)
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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