Local and Intermediate Range Structure of Thermoelectric Ca$_{3}$Co$_{4}$O$_{9}$

The detailed local and intermediate range structure of thermoelectric Ca$_{3}$Co$_{4}$O$_{4}$ has been examined. X-ray absorption spectroscopy has been to explore the structure about the Co, Ca and O sites. Detailed short and intermediate structural studies by x-ray PDF measurements are used to explore the structure over a broad range of temperatures. The connection of structure with observed physical properties is discussed.