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To obtain ceramics with a high density , it is essential a fine particle size and a high solids volume fraction .
 material: ceramics; machanical property: density; concept or principle: particle; process parameter: volume fraction
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: ceramics; machanical property: density; concept or principle: particle; process parameter: volume fraction