Citation: Liu, Jue; Whitfield, Pamela S.; Saccomanno, Michael R.; Bo, Shou-Hang; Hu, Enyuan; Yu, Xiqian; Bai, Jianming; Grey, Clare P.; Yang, Xiao-Qing; Khalifah, Peter G. (2017). In Situ Neutron Diffraction Studies of the Ion Exchange Synthesis Mechanism of Li2Mg2P3O9N: Evidence for a Hidden Phase Transition.. Journal of the American Chemical Society, , pp. -.