Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

Heymann, Günter; Riecken, Jan F.; Johrendt, Dirk; Rayaprol, Sudhindra; Pöttgen, Rainer; Huppertz, Hubert

doi:10.1039/c3dt51683k

Cited by 4 publications

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“…Even smaller fragments have recently been reported for the unique structure of Ce 4 Ag 3 Ge 4 O 0.5 . 24 The latter contains linear chains of corner-sharing OCe 2 Ce 2/2 tetrahedra. The structures of RE 2 AuP 2 O and Ce 4 Ag 3 Ge 4 O 0.5 also show different polyanionic substructures.…”

Section: Introductionmentioning

confidence: 99%

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀

et al. 2015

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The quaternary gold(I) arsenide oxides Nd10Au3As8O10 and Sm10Au3As8O10 were synthesized in sealed quartz ampoules from the rare earth (RE) elements, their appropriate sesquioxides, arsenic, arsenic(III) oxide and finely dispersed gold at maximum annealing temperatures of 1223 K. Both structures were refined from X-ray single crystal diffractometer data at room temperature and at 90 K. Nd10Au3As8O10 and Sm10Au3As8O10 crystallize with a new structure type that derives from the BaAl4 structure through distortions and formation of ordered vacancies. The structures consist of stacked polycationic [RE10O10](10+) layers with oxygen in tetrahedral rare earth coordination and polyanionic [Au(I)3(As2)4](10-) layers with gold in square planar or rectangular planar coordination of four arsenic dumbbells (255 pm As1-As2). In contrast to the well known ionic rare earth oxide layers, the gold arsenide layers rather show covalent bonding and account for the metallic nature of these two new arsenide oxides. This is confirmed by electronic structure calculations and resistivity measurements. The oxidation state of gold was investigated by (197)Au Mössbauer, X-ray absorption near edge structure (XANES) and photoelectron (XPS) spectroscopy. Due to missing comparative gold arsenide compounds, the monovalent gold phosphide oxides RE2AuP2O were measured for comparison. The XANES measurements additionally comprise monovalent gold arsenides REAuAs2. The XPS study contains BaAuAs as reference compound instead. Combination of all data clearly indicates Au(I), which was not observed in square planar coordination up to now. Temperature dependent magnetic susceptibility data show Curie-Weiss paramagnetism for Nd10Au3As8O10 and no magnetic ordering down to 2.5 K. Sm10Au3As8O10 shows the typical Van Vleck type paramagnetism for samarium compounds along with a transition to an antiferromagnetically ordered state at TN = 8.6 K.

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Section: Introductionmentioning

confidence: 99%

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀

et al. 2015

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“…The lowest degree of condensation is observed in the oxidic substructure of Ce 4 Ag 3 Ge 4 O 0.5 . The cerium tetrahedra show only half occupancy by oxygen and are condensed via common corners (Fig.…”

Section: Pnictide Oxidesmentioning

confidence: 98%

“…1 [23]. The two crystallographically independent phosphorus sites in La 3 Cu 4 P 4 O 2 (P 2 4À and the P 3À units) were resolved in 31 P solid state NMR spectra using a dipolar re-coupling approach.…”

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confidence: 99%

“…Although Ce 4 Ag 3 Ge 4 O 0.5 is a germanide, its structure fits into the crystal chemistry of the huge family of pnictide oxides [3,5,13]. Parts in the intermetallic substructure of Ce 4 Ag 3 Ge 4 O 0.5 resemble the structure of Ce 3 Ag 4 Ge 4 [31]. Temperature-dependent susceptibility measurements indicate trivalent cerium and the onset of magnetic ordering around 3.2 K.…”

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Dimensionality of the oxidic layers in pnictide oxides and transition metal p‐element ordering in tetrelides and pnictides

Bartsch

Johrendt²,

Pöttgen

2016

Physica Status Solidi (b)

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Pnictide oxides exhibit a rich crystal chemistry, which is much more than the ZrCuSiAs structure of LaFeAsO, the mother‐structure of the 1‐1‐1‐1 materials. The present micro‐review focuses on different dimensionalities in the oxidic and the pnictide substructures, largely extending the structural building units. The second part concerns BaAl4/ThCr2Si2 superstructures, which extend the crystal chemistry of BaFe2As2. Key parameters for superstructure formation are either an ordering of the transition metal and p‐element atoms (coloring) or an ordering of vacancies.

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The Gd3Cu4Ge4 type – Structure–property relations

Pöttgen

2023

Handbook on the Physics and Chemistry of Rare Earths

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Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

Cited by 4 publications

References 42 publications

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀

Dimensionality of the oxidic layers in pnictide oxides and transition metal p‐element ordering in tetrelides and pnictides

The Gd3Cu4Ge4 type – Structure–property relations

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Ce4Ag3Ge4O0.5 – chains of oxygen-centered [OCe2Ce2/2] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix

Cited by 4 publications

References 42 publications

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,197Au Mössbauer spectroscopic, XANES and XPS characterization of Nd10Au3As8O10and Sm10Au3As8O10

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,197Au Mössbauer spectroscopic, XANES and XPS characterization of Nd10Au3As8O10and Sm10Au3As8O10

Dimensionality of the oxidic layers in pnictide oxides and transition metal p‐element ordering in tetrelides and pnictides

The Gd3Cu4Ge4 type – Structure–property relations

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New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀

New quaternary arsenide oxides with square planar coordination of gold(i) – structure,¹⁹⁷Au Mössbauer spectroscopic, XANES and XPS characterization of Nd₁₀Au₃As₈O₁₀and Sm₁₀Au₃As₈O₁₀