Lanthanum and Praseodymium Bromide Pnictides. A Convergence of Interstitial Chemistry in Cluster Halides and Intermetallic Pnictides

Jensen, Elizabeth; Hoistad, Laura M.; Corbett, John D.

doi:10.1006/jssc.1999.8143

Cited by 16 publications

(11 citation statements)

References 21 publications

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“…The Mn5SÌ3-type lattice is known to possess an amazing ability to host a large number of interstitials ranging from the main group elements B, C, N, O, CI, Si, Br, I to transition metals Mn, Fe, Cu, Zn, Ag and Cd, among others [1][2][3][4][5]. These compounds, derived from the Nowotny phases [6][7][8], is exemplified by LasSmBr, which has 34 valence electrons [5].…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Zheng¹,

Li²,

Mattausch³

et al. 2002

Zeitschrift Für Kristallographie - New Crystal Structures

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BrIn 3 La 5 , hexagonal, Pôi/mcm (No. 193), a = 9.828(2) Â, c = 6.829(3) Â, V= 571.3 Â 3 , Z= 2, R^F) = 0.030, wR^F 2 ) = 0.065, T= 293 K. Source of materialThe title compound was synthesized from stoichiometric mixtures of La, LaBn and In under Ar-atmosphere in a sealed Ta ampoule at 1173 Κ for 65 days. As the reactants and the product are air and moisture sensitive, all handling was carried out under Ar atmosphere inside a glove box or through the Schlenk technique. DiscussionThe Mn5SÌ3-type lattice is known to possess an amazing ability to host a large number of interstitials ranging from the main group elements B, C, N, O, CI, Si, Br, I to transition metals Mn, Fe, Cu, Zn, Ag and Cd, among others [1][2][3][4][5]. These compounds, derived from the Nowotny phases [6][7][8], is exemplified by LasSmBr, which has 34 valence electrons [5]. Computational analysis demonstrated that the host lattice with La as the main component is very tolerant to the variation of the number of valence electrons [5]. This has led us to attempt the synthesis of Lasher, which is the first compound with a lanthanide as the first component and a group 13 element as the second. The number of valence electrons of 31 is still within the bonding range of the host framework [5].In this contribution we present the single crystal structure of LasIn3Br. As described elsewhere [2,5], the structure consists of face-sharing La¿ octahedron chains parallel to the c-axis (see figure). These octahedra of Lai are centered by the Br species and surrounded by type 2 La (La2) and the In atoms. La2 forms chains, also parallel to the c-axis, in the channels between these La6 octahedron chains. The La2-La2 and Lai-La2 distances are 3.414(2) Â and 4.029(1) Â, respectively. The latter is shorter than the Lai-Lai distances of 4.302 Â -4.534 Â in the La« octahedron. The shortest Lai-In distance is 3.351(2) Â. The La2-In distance is 3.4750(9) Â. Thus the primary metal-metal interaction is between La2 and La2, Lai and In, Lai and La2, La2 and In. The bonding pattern has been analyzed previously [2,5].

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Section: Discussionmentioning

confidence: 99%

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Zheng¹,

Li²,

Mattausch³

et al. 2002

Zeitschrift Für Kristallographie - New Crystal Structures

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“…The stuffed Mn 5 Si 3 -type structure, also known as the Hf 5 Cu 3 Sn-type structure, is adopted by an extensive family of polar intermetallic compounds that has long been popularized by Corbett. , For example, compounds such as La 5 Sb 3 Br can be considered to be formed by filling empty sites within the hexagonal host structure La 5 Sb 3 by interstitial Br atoms .…”

Section: Introductionmentioning

confidence: 99%

Anisotropic Transport and Magnetic Properties of Ternary Uranium Antimonides U₃ScSb₅ and U₃TiSb₅

et al. 2006

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Single needle-shaped crystals of U3ScSb5 and U3TiSb5 were grown in a tin flux. The structure of the new compound U3ScSb5 was determined from single-crystal X-ray diffraction data (Pearson symbol hP18, hexagonal, space group P63/mcm, Z = 2, a = 9.2145(2) Å, c = 6.1938(2) Å). The angular dependence of the magnetization has been studied. Ferromagnetic ordering develops within the ab plane at T C = 130 K for U3ScSb5 and 160 K for U3TiSb5, but there are essentially no magnetic interactions parallel to the c axis, confirming the high anisotropy expected from the crystal structure. In both cases, the easy axis for magnetization is the [120] direction. A sharp decrease below the ordering temperature is observed in the electrical resistivity parallel to the c axis; in contrast, the temperature dependence is much weaker within the ab plane. For U3TiSb5, a second transition occurs at 25 K, possibly arising from a spin reorientation process. The thermoelectric power measured along the c axis for both compounds is positive and small at high temperatures, following approximately a linear dependence with temperature indicative of metallic behavior in this region. The thermopower exhibits a kink at the ferromagnetic transition temperature in the case of U3TiSb5, but it is not so clear in the case of U3ScSb5. A change in sign of the thermopower occurs below T C for both compounds, characteristic of multiband conducting systems.

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“…It is isostructural to LasM^X (M = In, Sn, Bi; X=CI, Br, I) [3,4] and other phases with the MnsSi3-type structure stabilized by interstitial main group atoms B -O, CI -1 and transition metals Mn, Fe, Cu, Zn, Ag, Cd [5,6]. …”

Section: Discussionmentioning

confidence: 99%

Crystal structure of pentalanthanum trilead monoiodide, La5Pb3l

Hj.¹,

Simon²,

Zheng³

2004

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ILa5Pb3, hexagonal, P6ì/mcm (no. 193), a = 9.736(1) A, c = 6.947(1) A, V= 570.3 Â 3 , Z= 2, Rp(F) = 0.029, wRrerfF 2 ) = 0.068, T= 293 K. Source of materialLasPbal is prepared by heating a mixture of Lab, La and Pb (molar ratio 1:14:9) under Ar atmosphere in sealed Ta capsules at 1220 K for 5 days, yielding a pure phase. LasPbal forms silver colored needles sensitive to moisture. DiscussionThe crystal structure of LasPbjI is derived from the Nowotny phases H-

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Lanthanum and Praseodymium Bromide Pnictides. A Convergence of Interstitial Chemistry in Cluster Halides and Intermetallic Pnictides

Cited by 16 publications

References 21 publications

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Anisotropic Transport and Magnetic Properties of Ternary Uranium Antimonides U₃ScSb₅ and U₃TiSb₅

Crystal structure of pentalanthanum trilead monoiodide, La5Pb3l

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Lanthanum and Praseodymium Bromide Pnictides. A Convergence of Interstitial Chemistry in Cluster Halides and Intermetallic Pnictides

Cited by 16 publications

References 21 publications

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Crystal structure of pentalanthanum bromotriindate, La5In3Br

Anisotropic Transport and Magnetic Properties of Ternary Uranium Antimonides U3ScSb5 and U3TiSb5

Crystal structure of pentalanthanum trilead monoiodide, La5Pb3l

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Anisotropic Transport and Magnetic Properties of Ternary Uranium Antimonides U₃ScSb₅ and U₃TiSb₅