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However , the combined findings of x-ray diffraction and electron backscatter diffraction ( EBSD ) proved that SLM-ed 17-4 PH steel has a fully ferritic microstructure , more specifically δ ferrite .
 process characterization: x-ray diffraction; process characterization: electron backscatter diffraction; process characterization: EBSD; concept or principle: PH; material: ferritic; material: ferrite
Given options, please tell me the categories of all the listed entity words.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} 
 Entities: x-ray diffraction, electron backscatter diffraction, EBSD, PH, ferritic, ferrite 
Answer:
 process characterization: x-ray diffraction; process characterization: electron backscatter diffraction; process characterization: EBSD; concept or principle: PH; material: ferritic; material: ferrite