4864
For this study , 3D printed zirconia using NanoParticle Jetting™ was characterized in terms of chemistry , density , crystallography , sintering shrinkage and dielectric properties as a foundation for developing high performance radio frequency ( RF ) components .
 3D printed, chemistry, density, crystallography, sintering, shrinkage, dielectric, as, performance, components
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:
 3D printed, chemistry, density, crystallography, sintering, shrinkage, dielectric, as, performance, components