One could consider the CRC Handbook of Chemistry and Physics, depending on what properties you are after: http://hbcponline.com/faces/contents/ContentsSearch.xhtml;jsessionid=AFB0FD4EB1061A3E82943F0B5167872C
A good database for materials research is the Materials Project. In this database, you'll find theoretical results based on several methodologies for a comprehensive number of materials.
Personally I'd be using Google and Google Scholar plus FullFreePDF for specific searches I required and then based on these initial searches go to the original literature