Neutron Diffraction, Mössbauer Spectrum, and Magnetic Behavior of Ag2FeMn2(PO4)3 with Alluaudite-like Structure

Chouaibi, N.; Daidouh, Abdelaali; Pico, C.; Santrich, A.; Veiga, M.L.

doi:10.1006/jssc.2001.9128

Cited by 34 publications

(39 citation statements)

References 20 publications

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“…The magnetic behavior of these phases is quite similar to that observed in the isostructural Ag 2 FeMn 2 (PO 4 ) 3 compound (5 These results allow to conclude that new sodium orthophosphates with the alluaudite structures (Special group C2/c) have been synthesized, using solid-state reactions. Their electrical properties have been determined by impedance spectroscopy and polarization measurements.…”

Section: Magnetic Behavioursupporting

confidence: 57%

“…ossbauer spectra of Ag 2 FeMn 2 (PO 4 ) 3 (5) and the ionic conductivity of (Ag 1Àx Na x ) 2 FeMn 2 (PO 4 ) 3 with x = 0, 0.5, and 1 (6). The alluaudite structure of both systems, deduced from room-temperature neutron diffraction measurements, allowed us to improve the distribution of the transition metals (Fe, Mn) along the edge-sharing MnO 6 -FeO 6 -MnO 6 octahedra, concluding that the cations Mn and Mn/Fe are located, respectively, in 4e and 8f positions.…”

Section: Introductionmentioning

confidence: 99%

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Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Durio

Daidouh

Chouaibi

et al. 2002

Journal of Solid State Chemistry

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Section: Magnetic Behavioursupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Durio

Daidouh

Chouaibi

et al. 2002

Journal of Solid State Chemistry

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“…However, more recent structural refi nements of synthetic phosphates with the alluaudite structure (Yakubovich et al 1977;Antenucci 1992;Warner et al 1993;Antenucci et al 1993Antenucci et al , 1995Lii and Shih 1994;Leroux et al 1995aLeroux et al , 1995bLii and Ye 1997;Korzenski et al 1998;Hatert et al 2000Hatert et al , 2003Hatert et al , 2004Chouaibi et al 2001;Guesmi and Driss 2002;Ben Smail and Jouini 2002;Durio et al 2002;Hidouri et al 2003) clearly demonstrate the existence of three cationic sites that were not reported by Moore (1971). These sites are located in the channels at crystallographic positions which are different from those of the X1 and X2 sites.…”

Section: Introductionmentioning

confidence: 85%

Crystal chemistry of the hydrothermally synthesized Na2(Mn1-xFex2+)2Fe3+(PO4)3 alluaudite-type solid solution

Hatert

2005

American Mineralogist

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2 Fe 3+ (PO 4 ) 3 series, with x = 0.00, 0.25, 0.50, 0.75, and 1.00, were hydrothermally synthesized at 400 °C and 1 kbar. Stoichiometric quantities of NaH 2 PO 4 ⋅H 2 O, FePO 4 , MnO, and FeO were homogenized in a mortar and 100 mg of the mixture was sealed in silver tubes together with 10 * ABSTRACT Several compounds of the Na 2 (Mn 1-x Fe x 2+ ) 2 Fe 3+ (PO 4 ) 3 solid solution have been hydrothermally synthesized at 400 °C and 1 kbar; pure alluaudite-like compounds have been obtained for x = 0.00, 0.25, 0.50, 0.75, and 1.00. Rietveld refi nements of the powder X-ray diffraction patterns indicate the presence of Na + at the A1 and A2' sites, Mn 2+ and Fe 2+ at the M1 site, and Mn 2+ , Fe 2+ , and Fe 3+ at the M2 site. The presence of small amounts of Na + at the M1 site and Mn 2+ at the A1 site indicates a partially disordered distribution of these cations. An excellent linear correlation has been established between the M1-M2 distance and the energy of the infrared band attributed to the M 2+ -O vibrations. The Mössbauer spectra, measured between 85 and 295 K, were analyzed in terms of a model which includes the next-nearest neighbor interactions at the M2 and M1 crystallographic sites. Fe 2+ and Fe 3+ isomer shifts are typical of the alluaudite structure and exhibit the expected second-order Doppler shift. The derived iron vibrating masses and Mössbauer lattice temperatures are within the range of values expected for iron cations in an octahedral environment. The Fe 2+ and Fe 3+ quadrupole splittings are typical of the alluaudite structure, and the temperature dependence of the Fe 2+ quadrupole splitting was fi t with the Ingalls model, which yielded a ground state orbital splitting of ca. 460 to 735 cm -1 for the Fe 2+ sites. The isomer shifts and quadrupole splittings of Fe 2+ at the M1 site are larger than those of Fe 2+ at M2, indicating that the M1 site is both larger and more distorted than the M2 site.

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“…These papers (Yakubovich et al 1977;Antenucci 1992;Warner et al 1993;Antenucci et al 1995;Leroux et al 1995aLeroux et al , 1995bLii and Ye 1997;Korzenski et al 1998;Hatert et al 2000;Chouaibi et al 2001) clearly demonstrate the existence of three cationic sites in the alluaudite structure, sites that were not reported by Moore (1971). These papers (Yakubovich et al 1977;Antenucci 1992;Warner et al 1993;Antenucci et al 1995;Leroux et al 1995aLeroux et al , 1995bLii and Ye 1997;Korzenski et al 1998;Hatert et al 2000;Chouaibi et al 2001) clearly demonstrate the existence of three cationic sites in the alluaudite structure, sites that were not reported by Moore (1971).…”

Section: Introductionmentioning

confidence: 90%

An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe_1−xIn_x)₂(PO₄)₃alluaudite-type solid solution

Hatert

Hermann

Long

et al. 2003

American Mineralogist

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Several compounds of the NaMn(Fe 1-x In x ) 2 (PO 4 ) 3 solid solution were synthesized by solid state reaction in air; pure alluaudite-like compounds were obtained for x = 0.00 to 1.00. X-ray Rietveld refinements indicate the presence of Na + at the A1 and A2' sites, Mn 2+ at the M1 site, and Fe 2+ , Fe 3+ , and In 3+ at the M2 site. The presence of small amounts of In 3+ at the M1 site, and Mn 2+ at the M2 site, indicates a partially disordered distribution between these cations. A good correlation was also established between the M1-M2 bond distance and the b angle of the alluaudite-like compounds. The disordered distribution of Fe 2+ , Fe 3+ , and In 3+ at the M2 site is confirmed by the broadness of the infrared absorption bands. The Mössbauer spectra, measured between 90 and 295 K, were analyzed in terms of a model that takes into account the next-nearest neighbor interactions around the M2 crystallographic site. In all cases these spectra reveal the unexpected presence of small amounts of Fe 2+ at the M2 site, an amount that decreases as the In 3+ content increases. The Fe 2+ and Fe 3+ isomer shifts are typical of the alluaudite structure and vary with temperature, as expected from a second-order Doppler shift. The derived iron vibrating masses and Mössbauer lattice temperatures are within the expected range of values for iron cations in an octahedral environment. The Fe 2+ and Fe 3+ quadrupole splittings are also typical of the alluaudite structure and the temperature dependence of the Fe 2+ quadrupole splitting was fit with the model of Ingalls (1964), which yielded a ground state orbital splitting of ca. 380 to 570 cm -1 for the Fe 2+ sites.

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Neutron Diffraction, Mössbauer Spectrum, and Magnetic Behavior of Ag2FeMn2(PO4)3 with Alluaudite-like Structure

Cited by 34 publications

References 20 publications

Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Crystal chemistry of the hydrothermally synthesized Na2(Mn1-xFex2+)2Fe3+(PO4)3 alluaudite-type solid solution

An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe_1−xIn_x)₂(PO₄)₃alluaudite-type solid solution

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Neutron Diffraction, Mössbauer Spectrum, and Magnetic Behavior of Ag2FeMn2(PO4)3 with Alluaudite-like Structure

Cited by 34 publications

References 20 publications

Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Electrical Behavior of New Orthophosphates Na2M3(PO4)3 (M3=GaMn2, GaCd2, InMn2 and FeMnCd) with Alluaudite-Like Structure

Crystal chemistry of the hydrothermally synthesized Na2(Mn1-xFex2+)2Fe3+(PO4)3 alluaudite-type solid solution

An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe1−xInx)2(PO4)3alluaudite-type solid solution

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An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe_1−xIn_x)₂(PO₄)₃alluaudite-type solid solution