Ceramic Engineering and Science Proceedings Volume 34, Issue 4 - Advances in Solid Oxide Fuel Cells IX A collection of 13 papers from The American Ceramic Society's 37th International Conference on Advanced Ceramics and Composites, held in Daytona Beach, Florida, January 27-February 1, 2013. This issue includes papers presented in Symposium 3 - 10th International Symposium on Solid Oxide Fuel Cells: Materials, Science, and Technology.