1651
It was discovered that oxygen composition increase during spatter and X-ray diffraction shows that diffraction peaks of austenite content and ferrite are low due to the formation of iron oxides .
 material: oxygen; concept or principle: composition; process characterization: spatter; process characterization: X-ray diffraction; process characterization: diffraction; material: austenite; material: ferrite; material: iron oxides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: 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:
 material: oxygen; concept or principle: composition; process characterization: spatter; process characterization: X-ray diffraction; process characterization: diffraction; material: austenite; material: ferrite; material: iron oxides