Polymorphism in Na<sub>2</sub>(Co/Zn)P<sub>2</sub>O<sub>7</sub> and Na<sub>2</sub>(Co/Fe)P<sub>2</sub>O<sub>7</sub> Pyrophosphates: A Combined Diffraction and <sup>31</sup>P NMR Study
Journal of physical chemistry. C./Journal of physical chemistry. C