9049
Upon decreasing the thickness of the YSZ layers , respectively increasing the density of parallel interfaces , the total diffusion coefficient of the multilayer system is increased by a factor of 2 compared to bulk YSZ .
 Chemical: YSZ; Chemical: YSZ
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: YSZ; Chemical: YSZ