A NEW BISMUTH STRONTIUM VANADATE, BISR2V3O11, WITH BOTH ORTHOVANADATE AND PYROVANADATE GROUPS

A new bismuth strontium vanadate, BiSr2V3O11, has been synthesized, and its structure was determined from single crystal X-ray diffraction data. This compound may be represented by the descriptive formula BiSr2(VO4)(V2O7), indicating one orthovanadate group and one pyrovanadate group in each formula unit. The compound crystallizes in the triclinic space group P1 with a = 7.0332(6) Å, b = 10.213(2) Å, c = 6.982(2) Å, α = 96.01(2)°, β = 92.87(2)°, γ = 99.16(2)°, V = 491.3(1) Å3, and Z = 2. The Bi atom is 7-coordinated to oxygen atoms with BiO distances from 2.208(8) to 2.88(1) Å. Two types of Sr atoms were found: one with a coordination number of 9 and the other with one of 7. For the orthovanadate group, the average VO bond length is 1.72 Å and the OVO angles are in the range of 103.9(4)° to 116.2(4)°. For the pyrovanadate group, the average VO bond length is 1.716 Å and the VOV angle is 125.3°. © 1992.