New phases in the binary system PbO–BiVO4: Pb2BiVO6 and Pb4BiVO8
New phases in the binary system PbO–BiVO4: Pb2BiVO6 and Pb4BiVO8
复制标题
DOI：
10.1039/jm9950500901
复制
发表时间：
1995
影响因子：
--
通讯作者：
A. Mizrahi;J. Wignacourt;M. Drache;P. Conflant
中科院分区：
文献类型：
--
作者：
A. Mizrahi;J. Wignacourt;M. Drache;P. Conflant
双星体系PbO-BiVO4呈现出两个新相Pb4BiVO8和Pb2BiVO6。它们在780°C时完全熔化。它们已被单晶和粉末x射线衍射鉴定。Pb4BiVO8晶胞为三斜晶胞，a= 6.221(2) a, b= 7.603(5) a, c= 10.457(4) a, α= 100.40(3)°，β= 102.18(2)°，γ= 90.03(3)°，Z= 2。Pb2BiVO6在300、415、475和600℃时表现出四种相变。α相为单斜相，室温形态为a=7.642(6) a, b= 5.81 2(5) a, c= 28.85(2) a, β=100.3(1)°，Z= 8。β和γ相为正交相，分别为a= 8.381(6) a, b= 16.65(1) a, c= 4.859(6) a， Z= 4和a=14.304(7) a, b=10.14(1) a, c= 9.923(4) a， Z= 8。δ相为四方相，a= 12.110(2) a, c= 9.472(8) a， Z= 8。
The binary system PbO–BiVO4 exhibits two new phases, Pb4BiVO8 and Pb2BiVO6. They both melt congruently at 780 °C. They have been identified by single-crystal and powder X-ray diffraction. Pb4BiVO8 crystallizes with a triclinic cell, a= 6.221(2)A, b= 7.603(5)A, c= 10.457(4)A, α= 100.40(3)°, β= 102.18(2)°, γ= 90.03(3)° and Z= 2. Pb2BiVO6 exhibits four phase transitions at 300, 415, 475 and 600 °C. The α phase, room-temperature form, is monoclinic with a=7.642(6)A, b= 5.81 2(5)A, c= 28.85(2)A, β=100.3(1)° and Z= 8. The β and γ phases are orthorhombic with a= 8.381(6)A, b= 16.65(1)A, c= 4.859(6)A, Z= 4 and a=14.304(7)A, b=10.14(1)A, c= 9.923(4)A, Z= 8, respectively. The δ phase is tetragonal with a= 12.110(2)A, c= 9.472(8)A and Z= 8.