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This type of microstructure increases both strength and toughness relatively to other commonly used glasB-ceramics : they have a strength twice as higher as that of the first generation of leucite-reinforced ceramics .
 concept or principle: microstructure; machanical property: strength; machanical property: toughness; machanical property: strength; material: as; material: as; material: ceramics
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:
 concept or principle: microstructure; machanical property: strength; machanical property: toughness; machanical property: strength; material: as; material: as; material: ceramics