TY - JOUR
T1 - Hydrothermal synthesis, structure, and magnetic properties of a new polymorph of lithium vanadyl(IV) orthophosphate
T2 - β-LiVOPO4
AU - Lii, K. H.
AU - Li, C. H.
AU - Cheng, C. Y.
AU - Wang, S. L.
N1 - Funding Information:
Support for this study by the National Science Council and the Institute of Chemistry Academia Sinica is gratefully acknowledged.
PY - 1991/12
Y1 - 1991/12
N2 - A new polymorph of lithium vanadyl(IV) orthophosphate, β-LiVOPO4, has been synthesized hydrothermally in a sealed quartz glass tube under autogeneous pressure by slowly cooling from 450°C a mixture of Li2O, VO2, and 7.25 M H3PO4. This metastable compound has been characterized through a combination of techniques including single-crystal X-ray diffraction, differential thermal analysis, electron paramagnetic resonance, and magnetic susceptibility measurements. It crystallizes in the orthorhombic space group Pnma with a = 7.444(2), b = 6.300(1), c = 7.174(2) A ̊, V = 336.4(2) A ̊3, Z = 4, and R = 0.0248. Its framework consists of infinite chains of corner-shared VO6 octahedra, parallel to the a-axis, cross-linked by corner-shared PO4 tetrahedra. These infinite chains have alternating short and long VO bonds and are similar to those found in β-VOPO4. The Li atom has six close oxygen neighbors. The β → α-LiVOPO4 phase transition is reconstructive and occurs at ∼750°C. The magnetic susceptibility is analyzed considering the expression of Bonner and Fisher for S = 1 2 ions isotropically coupled in antiferromagnetic linear chains.
AB - A new polymorph of lithium vanadyl(IV) orthophosphate, β-LiVOPO4, has been synthesized hydrothermally in a sealed quartz glass tube under autogeneous pressure by slowly cooling from 450°C a mixture of Li2O, VO2, and 7.25 M H3PO4. This metastable compound has been characterized through a combination of techniques including single-crystal X-ray diffraction, differential thermal analysis, electron paramagnetic resonance, and magnetic susceptibility measurements. It crystallizes in the orthorhombic space group Pnma with a = 7.444(2), b = 6.300(1), c = 7.174(2) A ̊, V = 336.4(2) A ̊3, Z = 4, and R = 0.0248. Its framework consists of infinite chains of corner-shared VO6 octahedra, parallel to the a-axis, cross-linked by corner-shared PO4 tetrahedra. These infinite chains have alternating short and long VO bonds and are similar to those found in β-VOPO4. The Li atom has six close oxygen neighbors. The β → α-LiVOPO4 phase transition is reconstructive and occurs at ∼750°C. The magnetic susceptibility is analyzed considering the expression of Bonner and Fisher for S = 1 2 ions isotropically coupled in antiferromagnetic linear chains.
UR - http://www.scopus.com/inward/record.url?scp=0000948023&partnerID=8YFLogxK
U2 - 10.1016/0022-4596(91)90116-Y
DO - 10.1016/0022-4596(91)90116-Y
M3 - 期刊論文
AN - SCOPUS:0000948023
VL - 95
SP - 352
EP - 359
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
SN - 0022-4596
IS - 2
ER -