Authors
Yanning Song, Peter Y. Zavalij, Masatsugu Suzuki, M. Stanley Whittingham
Publication date
2002
Journal
Inorganic Chemistry
Volume
41
Issue
22
Pages
5778-5786
Description
Two new iron(III) phosphates, FePO4, have been synthesized from the dehydration of hydrothermally prepared monoclinic and orthorhombic hydrated phosphates FePO4·2H2O. The structures of both hydrates were redetermined from single crystal data. On dehydration, a topotactic reaction takes place with only those bonds associated with the water molecules being broken, so that both FePO4 phases have essentially the same Fe−P backbone frameworks as the corresponding hydrates. They are, respectively, monoclinic FePO4, space group P21/n, a= 5.480(1) Å, b = 7.480(1) Å, c= 8.054(1) Å, β = 95.71(1)°, and Z = 4; and orthorhombic FePO4, space group Pbca, a = 9.171(1) Å, 9.456(1) Å, c = 8.675(1) Å, and Z = 8. Both of these phases are thermally unstable relative to the trigonal quartz-like FePO4. The electrochemical studies find that the orthorhombic iron phosphate is more active than the monoclinic phase …
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Scholar articles
Y Song, PY Zavalij, M Suzuki, MS Whittingham - Inorganic chemistry, 2002