Occurence and correlation of two non-equivalent sites for europium in EuPd3B

Verwey-type transition in EuNiP

“…Below the transition, however, they are characterised by charge ordering with di-and trivalent Eu ions occupying distinct lattice sites. Such a behaviour is seen in Eu 3 S 4 [1][2][3][4][5][6][7][8], Eu 4 As 3 [9], EuBr x [10], EuPd 3 B [11][12][13] and EuPd 3 Si 0.25 [14].…”