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The behavior of phase formation , microstructure , density and mechanical properties of the samples with different heights were investigated .
 concept or principle: phase; concept or principle: microstructure; machanical property: density; concept or principle: mechanical properties; concept or principle: samples
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: phase; concept or principle: microstructure; machanical property: density; concept or principle: mechanical properties; concept or principle: samples