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The powder was characterized morphologically by particle size and shape distribution measurements , chemically through inert gas fusion for evaluation of oxygen content , and microstructurally by X-ray diffraction for phase identification .
 powder, particle, distribution, inert gas fusion, oxygen, X-ray diffraction, phase
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 powder, particle, distribution, inert gas fusion, oxygen, X-ray diffraction, phase