Citation: Liu, W.; Chen, H.-H.; Yang, X.X.; Zhao, J.-T.; Huang, Y.-X.; Schnelle, W. (2004). A mixed cation nickel diphosphate with a layered intergrowth structure: synthesis, structural and magnetic characterization of Na (N H4) (Ni2 (P2 O7)2 (H2 O)2). Solid State Sciences, 6, pp. 1375-1380.