The best place to look for research articles and their summarized reviews for elementary school students is through teacher education journals, and through science periodicals to which you may subscribe for a fee.
If you conduct an online search, your best bet will be to type "annotated bibliography science research, elementary school" or "annotated bibliography science K-6". The ERIC digest more than likely will come up as one of your options, just keep in mind that the articles should not be more than 3 years old as per modern regulation for using citations.
Also, look at NSTA (National Science Teachers).org to get the latest on research-based practices to teach science in the elementary school through the infusion of technology.
Enclosed are a few sites where you can get more information.
I hope it helps!