6540
Over-sintering the samples at 1080 ℃ further enhances the thermal conductivity by more than two folds , but it leads to uncontrolled shrinkage of the samples .
 concept or principle: samples; machanical property: thermal conductivity; concept or principle: shrinkage; concept or principle: samples
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: samples, thermal conductivity, shrinkage, samples 
Answer:
 concept or principle: samples; machanical property: thermal conductivity; concept or principle: shrinkage; concept or principle: samples