1458
Grain boundary cracking often generates along the grain boundaries due to the differences between boundary morphology and potential precipitate formation or dissolution .
 concept or principle: Grain boundary; concept or principle: cracking; concept or principle: grain boundaries; process characterization: boundary morphology; material: precipitate
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: Grain boundary; concept or principle: cracking; concept or principle: grain boundaries; process characterization: boundary morphology; material: precipitate