Crystal Structure and Physical Properties of BiCoPO5

Crystal Structure Approach of the Disordered New Compounds Bi∼1.2M∼1.2PO5.5 (M=Mn, Co, Zn): The Role of Oxygen-Centered Tetrahedra Linkage in the Structure of Bismuth–Transition Metal Oxy-phosphates

“…Symmetry code i: x; y; z; ii: Àx;Ày;Àz; iii: Àx; y; Assuming a sum of occupancies for the phosphorus sites equal to one and in accordance with the oxidation state +3 for the Bi atoms and +2 for the M atoms (justified by the preparation of the Zn compound), the formula deduced from the crystal structure approaches is close to Bi 1.2 M 1.2 PO 5.5 with Z ¼ 8 formula unit per cell. The formula can also be written as BiMP 0.833 O 4.583 very close to the already published BiCoPO 5 formula compound (13,22). Several experiments seem to confirm the proposed formula.…”

“…The synthesis and the crystal structure of BiNiPO 5 and BiCoPO 5 have been recently reported (12,13,22). The crystal structure of these compounds has been first described in terms of mixed double chains of two edgesharing MO 6 octahedra alternating with two edge-sharing BiO 6 octahedra and connected to each other through the PO 4 tetrahedra to form a three-dimensional network (12).…”

Synthesis, crystal structure and optical properties of BiMgVO5

“…We have chosen P2 1 =n as space group in spite of standard group P2 1 =c in order to compare with the previously determined phosphate structure BiNiPO 5 [4]. There is a similarity between these parameters and those of BiMPO 5 (M=Ni, Co, Mn); a ¼ 7:1664ð8Þ ( A, b ¼ 11:206ð1Þ ( A, c ¼ 5:1732ð6Þ ( A, b ¼ 107:281ð6Þ1 for BiNiPO 5 , as example [4][5][6][7][8]. The high values observed for the vanadate are due to the size of V 5+ (0.31 Å ) greater than that of P 5+ (0.17 Å ) [13].…”

“…Studies of Bi 2 O 3 -MO-X 2 O 5 (M=Mg, Mn, Co, Ni; X=P, V, As) systems revealed the series of compounds as BiMXO 5 . Crystal structures of BiMPO 5 (M=Mn, Co, Ni) [4][5][6][7][8], BiMVO 5 (M=Ca, Mn, Cd, Pb) [9][10][11][12] and BiMnAsO 5 [10] have been determined. To our knowledge the composition BiMgVO 5 has not been reported.…”

BiMn6PO12, A New Bismuth Manganese II/III Oxyphosphate with an Original Manganese–Oxygen Cubic Network

“…For M"Cu, BiCu PO was "rst isolated (6), belonging to the large series of compounds with formula BiM XO (M"Mg, Cu, Zn, Cd, Ca, Pb; X"P, V, As) (7}14) and Bi Cu P O (15), isotypic with Bi Cu V O (4,16). For M"Ni, the oxyphosphate BiNiPO has been structurally characterized (17), and the isotypic cobalt compound BiCoPO was obtained (18,19). We have recently undertaken the investigation of the Bi}Mn}P}O system, which proved to be very complicated due to the various oxidation states possible for manganese but of great interest owing to the attractive properties of mixed valence manganese oxides such as the colossal magnetoresistance (20).…”