1
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Tin‐rich stannides CePd
2
Sn
3
,
RE
Pd
2
Sn
4
, Pr
2
Pd
4
Sn
7
and
RE
3
Pd
6
Sn
10
– Crystal chemistry and
119
Sn Mössbauer spectroscopy. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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2
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Scheidt EW, Fischer A, Wybranski O, Eickerling G, Scherer W, Baenitz M, Mayr F, Heying B, Pöttgen R. Complex magnetic order from multiple Ce-sites in Ce 3Pd 4Sn 6. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:315801. [PMID: 28598335 DOI: 10.1088/1361-648x/aa787a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Polycrystalline [Formula: see text] [Formula: see text] [Formula: see text] samples were synthesized by arc-melting and subsequent annealing at 970 K. Specific heat, electrical resistivity and magnetic susceptibility measurements are performed over a wide range in temperature and provide hints for the presence of a complex magnetic ordering below 3 K arising from three crystallographically independent Ce sites. This behaviour is driven by a complex interplay between ferro-, ferri-, and antiferromagnetic correlations among the Ce atoms.
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Affiliation(s)
- E-W Scheidt
- CPM, Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86135 Augsburg, Germany
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3
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Niehaus O, Heymann G, Huppertz H, Rodewald UC, Chevalier B, Matar SF, Hoffmann RD, Pöttgen R. A ZrNiAl related high-pressure modification of CeRuSn. Dalton Trans 2016; 45:14216-29. [PMID: 27535169 DOI: 10.1039/c6dt02294d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monoclinic CeRuSn with its own structure type transforms to a high-pressure modification at 11.5 GPa and 1470 K (1000 t press, Walker type module). The structure of the high-pressure phase was refined from X-ray single crystal diffractometer data at room temperature. The HP-CeRuSn subcell structure adopts the ZrNiAl type: P6[combining macron]2m, a = 751.4(3) and c = 394.6(2) pm, wR2 = 0.0787, 310 F(2) values and 15 variables. The Ru2 atoms within the Sn6 trigonal prisms show a strongly enhanced U33 parameter. Weak satellite reflections indicate a commensurate modulation: (3 + 1)D superspace group P31m(1/3,1/3,γ)000, a = 751.4(3) and c = 394.6(2) pm, γ = -1/3, wR2 = 0.0786, 1584 F(2) values, 32 variables for the main reflections and wR2 = 0.3757 for the satellites of 1(st) order. A description of this new superstructure variant of the ZrNiAl type is possible in a transformed 3D supercell with the space group R3m and Z = 9. The driving force for formation of the modulation is strengthening of Ru-Sn bonding within the comparatively large Ru@Sn6 trigonal prisms. Electronic structure calculations point to an almost depleted Ce 4f shell. This is substantiated by temperature-dependent magnetic susceptibility data. Fitting of the data within the interconfiguration fluctuation model (ICF) resulted in cerium valences of 3.41 at 10 K and 3.31 at 350 K. Temperature dependent specific heat data underline the absence of magnetic ordering.
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Affiliation(s)
- Oliver Niehaus
- Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Universität Münster, Corrensstrasse 30, D-48149 Münster, Germany.
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4
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Niehaus O, Heymann G, Huppertz H, Rodewald UC, Heying B, Pöttgen R. High-pressure high-temperature decomposition of CeCoGa to the Laves phases CeCo0.58Ga1.42, CeCo0.72Ga1.28, and CeCo2. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2016. [DOI: 10.1515/znb-2016-0136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The monoclinic intermediate-valent gallide CeCoGa decomposes under high-pressure (HP) (9.5 GPa) high-temperature (HT) (1470 K) conditions into the Laves phases CeCo0.58Ga1.42 (MgCu2 type), CeCo0.72Ga1.28 (MgZn2 type; major product phase), and CeCo2 (MgCu2 type). The structures of the ternary Laves phases were refined from single crystal X-ray diffractometer data: Fd3̅m, a=778.3(1) pm, wR2=0.0310, 63 F
2 values, five variables for CeCo0.58(3)Ga1.42(3) and P63/mmc, a=547.24(5), c=858.76(7) pm, wR2=0.1009, 195 F
2 values, 13 variables for CeCo0.72(1)Ga1.28(1). Partial substitution of cobalt by gallium leads to a significant increase of the distances within the tetrahedral network: 253 pm Co–Co in CeCo2 as compared to 275 pm in CeCo0.58(3)Ga1.42(3) and 265–277 pm in CeCo0.72(1)Ga1.28(1). The crystal chemical consequences are briefly discussed.
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Affiliation(s)
- Oliver Niehaus
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Gunter Heymann
- Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universität Innsbruck, Innrain 80–82, A-6020 Innsbruck, Austria
| | - Hubert Huppertz
- Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universität Innsbruck, Innrain 80–82, A-6020 Innsbruck, Austria
| | - Ute Ch. Rodewald
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Birgit Heying
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
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5
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Janka O, Niehaus O, Pöttgen R, Chevalier B. Cerium intermetallics with TiNiSi-type structure. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2016. [DOI: 10.1515/znb-2016-0101] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Intermetallic compounds with the equiatomic composition CeTX that crystallize with the orthorhombic TiNiSi-type structure can be synthesized with electron-rich transition metals (T) and X = Zn, Al, Ga, Si, Ge, Sn, As, Sb, and Bi. The present review focusses on the crystal chemistry and chemical bonding of these CeTX phases and on their physical properties, 119Sn and 121Sb Mössbauer spectra, high-pressure effects, hydrogenation reactions and the formation of solid solutions in order to elucidate structure–property relationships. This paper is the final one of a series of four reviews on equiatomic intermetallic cerium compounds [Part I: Z. Naturforsch. 2015, 70b, 289; Part II: Z. Naturforsch. 2015, 70b, 695; Part III: Z. Naturforsch. 2016, 71b, 165].
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Affiliation(s)
- Oliver Janka
- Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Oliver Niehaus
- Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Rainer Pöttgen
- Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30, 48149 Münster, Germany
| | - Bernard Chevalier
- Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) , CNRS [UPR 9048], Université de Bordeaux , Avenue du Docteur A. Schweitzer, 33608 Pessac Cedex, France
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6
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Heymann G, Heying B, Rodewald UC, Janka O, Huppertz H, Pöttgen R. High-pressure high-temperature crystal growth of equiatomic rare earth stannides RENiSn and REPdSn. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.06.044] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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7
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Heying B, Rodewald UC, Pöttgen R. The Stannides Nd 3Pd 5Sn 5, Gd 3Pd 4.96(1)Sn 5, and GdPdSn. Z Anorg Allg Chem 2015. [DOI: 10.1002/zaac.201400414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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8
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Bolotina NB, Tursina AI, Nesterenko SN. Structural analysis of modulated crystals. A new structure of Ce4Pd13.6Sn5.9. J STRUCT CHEM+ 2013. [DOI: 10.1134/s0022476612070037] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Heymann G, Riecken JF, Johrendt D, Rayaprol S, Pöttgen R, Huppertz H. Ce4Ag3Ge4O(0.5)--chains of oxygen-centered [OCe2Ce(2/2)] tetrahedra embedded in a [CeAg3Ge4] intermetallic matrix. Dalton Trans 2013; 42:15207-13. [PMID: 24030014 DOI: 10.1039/c3dt51683k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The oxidation of an intermetallic phase under high-pressure/high-temperature conditions led to the synthesis of Ce4Ag3Ge4O(0.5) exhibiting [OCe2Ce(2/2] tetrahedral chains, in which the oxygen atoms statistically occupy the tetrahedral centres. Starting from a 1:1:1 CeAgGe precursor (NdPtSb type), a multianvil high-pressure/high-temperature experiment at 11.5 GPa and 1250-1300 °C revealed Ce4Ag3Ge4O(0.5), crystallizing in the space group Pnma with the following lattice parameters: a = 2087.3(4), b = 439.9(1), and c = 1113.8(2) pm. Magnetic measurements showed Curie-Weiss behavior above 100 K with an experimental magnetic moment of 2.42 µB per Ce atom, close to the value for the free Ce(3+) ion, clearly indicating trivalent cerium in Ce4Ag3Ge4O(0.5). Full potential GGA+U band structure calculations resulted in metallic properties and a magnetic ground state with one unpaired 4f-electron per cerium in agreement with the experiments.
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Affiliation(s)
- Gunter Heymann
- Institut für Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universität Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria.
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10
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Chevalier B, Hermes W, Gaudin E, Pöttgen R. New high temperature modification of CeTiGe: structural characterization and physical properties. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2010; 22:146003. [PMID: 21389537 DOI: 10.1088/0953-8984/22/14/146003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The new high temperature form (HT) of the ternary germanide CeTiGe was prepared by annealing at 1373 K. The investigation of HT-CeTiGe by x-ray powder diffraction shows that the compound crystallizes in the tetragonal CeScSi type structure (space group I4/mmm; a=414.95(2) and c=1590.85(10) pm as unit cell parameters). Electrical resistivity, thermoelectric power, magnetization and specific heat measurements performed down to 2 K on HT-CeTiGe reveal a non-magnetic strongly correlated electron system; the specific heat divided by temperature attains a value of 0.635 J mol(-1) K(-2) at 2 K. The comparison of the physical properties of the two crystallographic modifications of CeTiGe suggests a decrease of the hybridization J(cf) between 4f(Ce) and conduction electrons in the sequence LT-CeTiGe [Formula: see text]-CeTiGe (CeScSi type).
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Affiliation(s)
- B Chevalier
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Docteur Albert Schweitzer, 33608 Pessac Cedex, France
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11
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Hermes W, Mishra R, Müller H, Johrendt D, Pöttgen R. Structure and Properties of Dimorphic CePdZn. Z Anorg Allg Chem 2009. [DOI: 10.1002/zaac.200900054] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Sebastian CP, Heymann G, Heying B, Rodewald UC, Huppertz H, Pöttgen R. Dimorphic ErAgSn and TmAgSn – High-Pressure and High-Temperature Driven Phase Transitions. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200700011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Riecken JF, Hermes W, Chevalier B, Hoffmann RD, Schappacher FM, Pöttgen R. Trivalent-Intermediate Valent Cerium Ordering in CeRuSn – A Static Intermediate Valent Cerium Compound with a Superstructure of the CeCoAl Type. Z Anorg Allg Chem 2007. [DOI: 10.1002/zaac.200700066] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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