4940
Utilizing the DAD process , a very heterogeneous mixture of silicate and titanate mineral phases was transformed in a single step to a fully dense , nano-grained coating with spatially homogeneous composition at the micro-scale .
 concept or principle: process; concept or principle: heterogeneous; material: silicate; concept or principle: step; process parameter: fully dense; application: coating; concept or principle: homogeneous composition; concept or principle: micro-scale
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: process, heterogeneous, silicate, step, fully dense, coating, homogeneous composition, micro-scale 
Answer:
 concept or principle: process; concept or principle: heterogeneous; material: silicate; concept or principle: step; process parameter: fully dense; application: coating; concept or principle: homogeneous composition; concept or principle: micro-scale