Low thermal conductivity, compatible thermal expansion coefficient, and good calcium—magnesium—aluminosilicate (CMAS) corrosion resistance are critical requirements of environmental barrier coatings for silicon-based ceramics. Rare earth silicates have been recognized as one of the most promising environmental barrier coating candidates for good water vapor corrosion resistance. However, the relatively high thermal conductivity and high thermal expansion coefficient limit the practical application. Inspired by the high entropy effect, a novel rare earth monosilicate solid solution (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 was designed to improve the overall performance. The as-synthesized (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 shows very low thermal conductivity (1.07 W·m−1·K−1 at 600 °C). Point defects including mass mismatch and oxygen vacancies mainly contribute to the good thermal insulation properties. The thermal expansion coefficient of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 can be decreased to (4.0–5.9)×10−6 K−1 due to severe lattice distortion and chemical bonding variation, which matches well with that of SiC ((4.5–5.5)×10−6 K−1). In addition, (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 presents good resistance to CMAS corrosion. The improved performance of (Ho0.25Lu0.25Yb0.25Eu0.25)2SiO5 highlights it as a promising environmental barrier coating candidate.
This paper was presented at the Invited Panel session "Technical Communication in China". Technical documentation quality is an essential part of product help center quality. As user information behavior gains increasing attention in user-interface design, for help centers, understanding user's information behavior of documentation provides insights to better develop product resources. To improve help center quality, we focus on typical technical documentation usersdevelopers and their information behavior. We used combined sociological approaches and conducted a twophase user research: an in-depth interview was first performed to gain basic idea of developers' documentation acquiring and using habits; then, a questionnaire survey was conducted to validate former result and further explore the factors influence those behaviors. This paper present how developers need, acquire and use technical documentations, and discussed the related factors. According to the result, we found that developers have preference in documentation acquiring methods, besides, quickly locating target information is their common way to start using a documentation. Furthermore, gender and user documentation dependency both have impact on their information behaviors and documentation using experience. In conclusion, developers' information behaviors of technical documentation have patterns, and these patterns should be carefully considered in help centers' future development.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.