Synthesis and characterization of new strontium iron(II) phosphates, SrFe2(PO4)2 and Sr9Fe1.5(PO4)7 / Belik A.A., Lazoryak B.I., Pokholok K.V., Terekhina T.P., Leonidov I.A., Mitberg E.B., Karelina V.V., Kellerman D.G. // Journal of Solid State Chemistry. - 2001. - V. 162, l. 1. - P. 113-121.

ISSN:

00224596

Type:

Article

Abstract:

New strontium iron(II) orthophosphates, SrFe2(PO4)2 and Sr9Fe1.5(PO4)7, were synthesized by the solid state method at 1170 K. They were characterized by X-ray powder diffraction, thermal analysis in air, magnetic susceptibility, and the IR and Mössbauer spectroscopy methods. Mössbauer spectroscopy confirmed the presence of only Fe2+ cations in both compounds. SrFe2(PO4)2 crystallizes in a monoclinic system with a = 10.5376(7) Å, b = 6.8529(4) Å, c = 9.3658(6) Å, β = 109.498(5)°. The crystal structure of Sr9Fe1.5(PO4)7 was refined by the Rietveld method: space group R-3m; Z = 3; a = 10.6102(1) Å, c = 19.7135(1) Å with Rwp = 3.00% (S = 1.51), Rp = 2.35%, RB = 3.44%, RF = 1.72%. A second-harmonic-generation study showed that the structures of these two compounds have a center of symmetry. The crystal structure of Sr9Fe1.5(PO4)7 is related to that of β-Ca3(PO4)2 and α-Sr3(PO4)2, but is topologically more similar to that of β-Ca3(PO4)2. Tetrahedra P1O4 and strontium cations in the M3 sites are disordered in the structure of Sr9Fe1.5(PO4)7. The octahedral M5 site is fully occupied and the M4 site is quarter-occupied by iron cations. SrFe2(PO4)2 and Sr9Fe1.5(PO4)7 are stable in air up to 750 and 810 K, respectively. © 2001 Academic Press.

Author keywords:

Crystal structure; IR spectroscopy; Iron; Magnetic susceptibility; Mössbauer spectroscopy; Phosphate; Rietveld method; Strontium

Index keywords:

strontium iron phosphate; unclassified drug; analytic method; article; chemical analysis; crystal structure; crystallization; magnetism; Mossbauer spectroscopy; solid state; synthesis; X ray diffracti

DOI:

10.1006/jssc.2001.9363

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035891513&doi=10.1006%2fjssc.2001.9363&partnerID=40&md5=ec08c368dbb9d15dc92098a17fc4b17e

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-0035891513&doi=10.1006%2fjssc.2001.9363&partnerID=40&md5=ec08c368dbb9d15dc92098a17fc4b17e
Affiliations	Department of Chemistry, Moscow State University, 119899, Moscow, Russian Federation; Institute of Solid State Chemistry Ural Branch, Russian Academy of Sciences, Pervomayskaia 91, GSP-145, 620219, Yekaterinburg, Russian Federation
Author Keywords	Crystal structure; IR spectroscopy; Iron; Magnetic susceptibility; Mössbauer spectroscopy; Phosphate; Rietveld method; Strontium
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Correspondence Address	Lazoryak, B.I.; Department of Chemistry, Moscow State University, 119899 Moscow, Russian Federation; email: lazoryak@tech.chem.msu.ru
CODEN	JSSCB
Language of Original Document	English
Abbreviated Source Title	J. Solid State Chem.
Source	Scopus