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What is the range of detecting lower limit of impurity phases in percentage?

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in Solid State Chemistry by (14.1k points)
What is the range of detecting lower limit of impurity phases in percentage?

(a) 1 to 5

(b) 10 to 20

(c) 20 to 50

(d) 50 to 70

The question was asked in examination.

Origin of the question is Survey of Techniques and their Applications to Solids in chapter Preparative Methods of Solid State Chemistry

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The correct choice is (a) 1 to 5

Easiest explanation: The powder X-ray diffraction method can be used as a rough check on purity provided the impurities are present as a separate crystalline phase(s). The lower limit of detection of impurity phases in routine work is usually in the range of 1 to 5 percent.

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