6097
Focused ion beam and transmission electron microscopy were employed to characterize the interfacial properties between tungsten carbide and steel matrix .
 concept or principle: ion; machine or equipment: beam; process characterization: transmission electron microscopy; concept or principle: properties; material: tungsten carbide; material: steel
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: ion, beam, transmission electron microscopy, properties, tungsten carbide, steel 
Answer:
 concept or principle: ion; machine or equipment: beam; process characterization: transmission electron microscopy; concept or principle: properties; material: tungsten carbide; material: steel