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See detailStructural Chemistry and Spin-glass Behaviour of Nd18Li8Fe4TiO39
Thammajak, N; Battle, Peter D.; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2012), 187

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(8) Å ... [more ▼]

Nd18Li8Fe4TiO39 has been synthesised and characterised by neutron powder diffraction, X-ray absorption spectroscopy, Mossbauer spectroscopy and magnetometry. The cubic structure (Pm3 n, a=411.97227(8) Å) is based on intersecting <1 1 1> chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd–O framework. The larger of the two crystallographically distinct octahedral sites, 8e, is occupied by iron, titanium and lithium in a ratio of 76:20:4; the smaller, 2a, is occupied by iron and titanium in a ratio of 79:21. The trigonal-prismatic site, 16i, is occupied by lithium and iron in a ratio of 98:2. The cations on the 2a sites are assigned as Ti4+and low-spin Fe4+, and those on the 16i sites as Li+ and Fe3+. The 8e sites are thought to be occupied by Li+, Fe3+ and Ti3+. Nd18Li8Fe4TiO39 undergoes a transition to a spin-glass state at 4.25(5) K. [less ▲]

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See detailMicrostructure analyses and thermoelectric properties of Ag1-xPb18Sb1+yTe20
Perlt, S.; Hoeche, Th; Dadda, J. et al

in Journal of Solid State Chemistry (2012), 193(SI), 58-63

This study reports microstructural investigations of long-term annealed 18, x=y=0, hereinafter referred to as AgPb18SbTe20) (Lead-Antimony-Silver-Tellurium, LAST-18) as well as of Ag1-xPb18Sb1+yTe20, i.e ... [more ▼]

This study reports microstructural investigations of long-term annealed 18, x=y=0, hereinafter referred to as AgPb18SbTe20) (Lead-Antimony-Silver-Tellurium, LAST-18) as well as of Ag1-xPb18Sb1+yTe20, i.e. Ag-deficient and Sb-excess LAST-18 (x not equal 0, y not equal 0), respectively. Two different length scales are explored. The micrometer scale was evaluated by SEM to analyze the volume fraction and the number of secondary phases as well as the impact of processing parameters on the homogeneity of bulk samples. For AgPb18SbTe20, site-specific FIB liftout of TEM lamellae from thermoelectrically characterized samples was accomplished to investigate the structure on the nanometer scale. High-resolution TEM and energy-filtered TEM were performed to reveal shape and size distribution of nanoprecipitates, respectively. A hypothesis concerning the structure-property relationship is set out within the frame of a gradient annealing experiment. This study is completed by results dealing with inhomogeneities on the micrometer scale of Ag1-xPb18Sb1+yTe20 and its electronic properties. (C) 2012 Elsevier Inc. All rights reserved. [less ▲]

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See detailStructural and magnetic properties of Nd 18Li 8Co 4-xFe xO 39-y and Nd 18Li 8Co 4-xTi xO 39-y
Battle, Peter; Dutton, Sean E; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2011), 84

Nd18Li8Co3FeO39–y, Nd18Li8CoFe3O39–y and Nd18Li8Co3TiO39 39–y have been synthesisd and characterised by neutron powder diffraction, magnetometry and Mossbauer spectroscopy. Their cubic structure (Pm–3n, a ... [more ▼]

Nd18Li8Co3FeO39–y, Nd18Li8CoFe3O39–y and Nd18Li8Co3TiO39 39–y have been synthesisd and characterised by neutron powder diffraction, magnetometry and Mossbauer spectroscopy. Their cubic structure (Pm–3n, a~11.9 Å) is based on intersecting <1 1 1 > chains comprised of alternating octahedral and trigonal-prismatic coordination sites. These chains lie within hexagonal-prismatic cavities formed by a Nd–O framework. Each compound has an incomplete oxide sublattice (y~1), with vacancies located around the octahedral sites that lie at the points of chain intersection. These sites are fully occupied by a disordered arrangement of transition-metal ion-cations but only 75% of the remaining octahedral sites are occupied. The trigonal-prismatic sites are fully occupied by lithium except in the case of Nd18Li8CoFe3O39–y where some iron is present. Antiferromagnetic interactions are present on the Nd sublattice in each composition, but a spin glass forms below 5 K when a high concentration of spins is also present on the octahedral sites. [less ▲]

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See detailLocal ordering and magnetism in Ga0.9Fe3.1N
Burghaus, Jens; Sougrati, Moulay T.; Moechel, Anne et al

in Journal of Solid State Chemistry (2011), 184(9), 2315-2321

Prior investigations of the ternary nitride series Ga1-xFe3+xN (0 <= x 1) have indicated a transition from ferromagnetic gamma'-Fe4N to antiferromagnetic ``GaFe3N''. The ternary nitride ``GaFe3N'' has ... [more ▼]

Prior investigations of the ternary nitride series Ga1-xFe3+xN (0 <= x 1) have indicated a transition from ferromagnetic gamma'-Fe4N to antiferromagnetic ``GaFe3N''. The ternary nitride ``GaFe3N'' has been magnetically and spectroscopically reinvestigated in order to explore the weakening of the ferromagnetic interactions through the gradual incorporation of gallium into gamma'-Fe4N. A hysteretic loop at RI reveals the presence of a minority phase of only 0.1-0.2 at\%, in accord with the sound two-step synthesis. The composition of the gallium-richest phase ``GaFe3N'' was clarified by Prompt Gamma-ray Activation Analysis and leads to the berthollide formula Ga0.91(1)Fe3.09(10)N1.05(7). Magnetic measurements indicate a transition around 8 K, further supported by Mossbauer spectral data. The weakening of the ferromagnetic coupling through an increasing gallium concentration is explained by a simple Stoner argument. In Ga0.9Fe3.1N the presence of iron on the gallium site affects the magnetism by the formation of 13-atom iron clusters. (C) 2011 Elsevier Inc. All rights reserved. [less ▲]

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See detailImprovement of the thermoelectric properties of [Bi1.68Ca2O4-delta](RS)[CoO2](1.69) cobaltite by chimie douce methods
Muguerra, Hervé; Rivas-Murias, Beatriz; Traianidis, Maria et al

in Journal of Solid State Chemistry (2010), 183(6), 1252-1257

[Bi1 68Ca2O4 delta](RS)[CoO2](1 69) has been obtained by different chimie douce methods and uniaxially or isostatically pressed The influence of these parameters on the thermoelectric properties has been ... [more ▼]

[Bi1 68Ca2O4 delta](RS)[CoO2](1 69) has been obtained by different chimie douce methods and uniaxially or isostatically pressed The influence of these parameters on the thermoelectric properties has been investigated. Contrary to the Seebeck coefficient, which remains unchanged, the electrical conductivity is greatly modified In particular, spray-drying synthesis followed by uniaxial pressing results in an electrical conductivity two times larger than in the case of conventional solid state synthesis. Our results suggest that a narrow particle size distribution is beneficial to the thermoelectric properties of the layered compounds. The spray-drying technique seems to be promising to Improve the electrical conductivity of layered materials. Moreover, this method presents other advantages (homogeneous samples and less energetic processing) which could be interesting to the future manufacturing of thermoelectric devices (C) 2010 Elsevier Inc. All rights reserved [less ▲]

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See detailStructural and magnetic properties of Pr18Li8Fe5-xMxO39 (M = Ru, Mn, Co)
Dutton, Sian E; Battle, Peter D; Grandjean, Fernande ULg et al

in Journal of Solid State Chemistry (2009), 182(7), 1638-1648

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5 ... [more ▼]

A polycrystalline sample of Pr18Li8Fe4RuO39 has been synthesized by a solid state method and characterized by neutron powder diffraction, magnetometry and Mossbauer spectroscopy; samples of Pr18Li8Fe5-xMxO39 and Pr18Li8Fe5-xCoxO39 (x = 1, 2) have been studied by magnetometry. All these Compounds adopt a cubic structure (space group Pm (3) over barn, a(o)similar to 11.97 angstrom) based on intersecting < 111 > chains made up of alternating octahedral and trigonal-prismatic coordination sites. These chains occupy channels within a Pr-O framework. The trigonal-prismatic site in Pr18Li8Fe4RuO39 is occupied by Li+ and high-spin Fe3+. The remaining transition-metal cations occupy the two crystallographically-distinct octahedral sites in a disordered manner. All five compositions adopt a spin-glass-like state at 7 K (Pr18Li8Fe4RuO39) or below. (C) 2009 Elsevier Inc. All rights reserved. [less ▲]

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See detailCorrelation between optical constants and crystal chemical parameters of ZrW2O8
Shannon, Robert D; Fischer, Reinhard X; Medenbach, Olaf et al

in Journal of Solid State Chemistry (2009), 182(10), 2762-2768

The refractive indices of ZrW2O8, measured at wavelengths of 435.8-643.8 nm, were used to calculate n(D) at lambda = 589.3 nm and n(infinity) at lambda = infinity from a one-term Sellmeier equation ... [more ▼]

The refractive indices of ZrW2O8, measured at wavelengths of 435.8-643.8 nm, were used to calculate n(D) at lambda = 589.3 nm and n(infinity) at lambda = infinity from a one-term Sellmeier equation. Refractive indices, n(D) and dispersion values, A, are, respectively, 1.8794 and 114 x 10(-16) m(2). The high dispersion, relative to other molybdates, tungstates and Zr-containing compounds, is attributed to the low value of E-o = 7.7 eV and mean cation coordination number. Total electronic polarizabilities, alpha(total), were calculated from n(infinity) and the Lorenz-Lorentz equation. The unusually large difference between the observed polarizability of 20.087 angstrom(3) and the calculated total polarizability alpha(T) of 17.59 angstrom(3) (Delta = +12.4%) is attributed to (1) a large M-O-W angle, (2) a high degree of W 5d-O(terminal) 2p and Zr nd-O 2p hybridization, and (3) unusually high oxygen displacement factors, B(O), normalized to B(W). (C) 2009 Elsevier Inc. All rights reserved. [less ▲]

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See detailHyperfine interactions and lattice dynamics of Sn21O6Cl16(OH)(14)
Sougrati, Moulay Tahar ULg; Jouen, S.; Hannoyer, Béatrice et al

in Journal of Solid State Chemistry (2008), 181(9), 2473-2479

In this study, the tin(II) oxy-hydroxychloride Sn21O6Cl16(OH)(14) has been synthesised and investigated, This compound is the synthetic equivalent of mineral abhurite, which was discovered in 1985 as a ... [more ▼]

In this study, the tin(II) oxy-hydroxychloride Sn21O6Cl16(OH)(14) has been synthesised and investigated, This compound is the synthetic equivalent of mineral abhurite, which was discovered in 1985 as a tin corrosion product formed on the surface of tin ingots after long immersion in seawater. The Mossbauer parameters of Sn(21)O6Cl(16)(OH)(14) determined at various temperatures are reported and discussed for the first time. At room temperature, the isomer shift and the quadrupole splitting are, respectively, delta = 3.22 mm s(-1) and Delta = 1.71 mm s(-1) relative to the centroid of the spectrum of BaSnO3. ne Mossbauer recoil-free fraction has been also evaluated over a wide range of temperature. At 300 K, the recoil-free fraction of Sn21O6Cl16(OH)(14) is f(300) = 0.09 +/- 0.02. (C) 2008 Elsevier Inc. All rights reserved. [less ▲]

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See detailThe crystal chemistry of lithium in the alluaudite structure: A study of the (Na1-xLix)Cdln(2) (PO4)(3) the solid solution (x=0 to 1)
Hatert, Frédéric ULg; Antenucci, Diano ULg; Fransolet, André-Mathieu ULg et al

in Journal of Solid State Chemistry (2002), 163(1), 194-201

Several compounds of the (Na1-xLix)CdIn2(PO4)(3) solid solution were synthesized by a solid-state reaction in air, and pure alluaudite-like compounds were obtained for x = 0.00, 0.25, and 0.50. X-ray ... [more ▼]

Several compounds of the (Na1-xLix)CdIn2(PO4)(3) solid solution were synthesized by a solid-state reaction in air, and pure alluaudite-like compounds were obtained for x = 0.00, 0.25, and 0.50. X-ray Rietveld refinements indicate the occurrence of Cd2+ in the M(1) site, and of In3+ in the M(2) site of the alluaudite structure. This non-disordered cationic distribution is confirmed by the sharpness of the infrared absorption bands. The distribution of Na+ and Li+ on the A(1) and A(2)' crystallographic sites cannot be accurately assessed by the Rietvled method, probably because the electronic densities involved in the Na+ --> Li+ substitution are very small. A comparison with the synthetic alluaudite-like compounds, (Na1-xLix)MnFe2(PO4)(3), indicates the influence of the cations occupying the M(1) and M(2) sites on the coordination polyhedra morphologies of the A(1) and A(2)' crystallographic sites. (C) 2002 Elsevier Science. [less ▲]

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See detailCopper whisker growth from inside sulfur-doped YBa2Cu307-X pellets
Cloots, Rudi ULg; Krekels, T.; Warin, R. et al

in Journal of Solid State Chemistry (1995), 117(1), 151-156

We report on the growth of Cu whiskers (10 mu m in linear transverse size) at the surface of a YBCO pellet, in a sulfur-rich atmosphere at a high synthesis temperature. Growth arises from inside the ... [more ▼]

We report on the growth of Cu whiskers (10 mu m in linear transverse size) at the surface of a YBCO pellet, in a sulfur-rich atmosphere at a high synthesis temperature. Growth arises from inside the pellet since there is no Cu in the surrounding atmosphere. We present the experimental conditions and electron microscopic observations. We briefly propose a mechanism based on chemical considerations, in particular, a Cu reductive nucleation of the CuS phase at the surface of YBCO. Natural phenomena, laboratory findings, and computer simulation work (based on an Eden model) support this interpretation. [less ▲]

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