High-pressure phases of Tb2Ni2Sn and Dy2Ni2Sn
| hal.structure.identifier | Institut für Allgemeine, Anorganische und Theoretische Chemie | |
| dc.contributor.author | HEYMANN, Gunter | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | HEYING, Birgit | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | RODEWALD, Ute Ch. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CHEVALIER, Bernard | |
| hal.structure.identifier | Institut für Allgemeine, Anorganische und Theoretische Chemie | |
| dc.contributor.author | HUPPERTZ, Hubert | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | PÖTTGEN, Rainer | |
| dc.date.issued | 2014 | |
| dc.identifier.issn | 0026-9247 | |
| dc.description.abstractEn | The W2B2Co-type ternary stannides Tb2Ni2Sn and Dy2Ni2Sn (space group Immm) show pressure-induced reconstructive phase transitions. Under high-pressure (8 GPa) and high-temperature (1,470 K) treatment they transform to the tetragonal Mo2B2Fe-type high-pressure (HP) modifications: P4/mbm, a = 732.6(1) pm, c = 371.71(9) pm, wR2 = 0.0319, 225 F 2 values for HP-Tb2Ni2Sn and a = 730.3(2) pm, c = 369.1(2) pm, wR2 = 0.0221, 230 F 2 values for HP-Dy2Ni2Sn, with 12 variables per refinement. At 8 GPa HP-Tb2Ni2Sn and HP-Dy2Ni2Sn started to decompose into the equiatomic stannides TbNiSn and DyNiSn and a yet unknown phase. Single-crystal diffractometry revealed the following data: TiNiSi type, Pnma, a = 714.9(1) pm, b = 445.9(1) pm, c = 766.4(1) pm, wR2 = 0.0558, 575 F 2 values, 20 parameters for TbNiSn and a = 710.5(1) pm, b = 445.31(9) pm, c = 765.7(1) pm for DyNiSn. The cell volumes of HP-Tb2Ni2Sn and HP-Dy2Ni2Sn nicely fit into the Iandelli plot of the whole RE2Ni2Sn (RE = rare earth) series of compounds. The polyanionic networks [NiSn] and [Ni2Sn] of the investigated ternary stannides show covalent Ni-Sn bonding with distorted tetrahedral SnNi4/4 coordination (259−279 pm Ni-Sn) in the RENiSn compounds and a square-planar SnNi4/4 arrangement (291−292 pm Ni-Sn) in HP-Tb2Ni2Sn and HP-Dy2Ni2Sn. The nickel atoms form Ni2 pairs with Ni-Ni distances of 250 pm. | |
| dc.language.iso | en | |
| dc.publisher | Springer Verlag | |
| dc.title.en | High-pressure phases of Tb2Ni2Sn and Dy2Ni2Sn | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1007/s00706-014-1179-8 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Chemical Monthly = Monatshefte für Chemie | |
| bordeaux.page | 863-867 | |
| bordeaux.volume | 145 | |
| bordeaux.issue | 6 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00990899 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00990899v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemical%20Monthly%20=%20Monatshefte%20f%C3%BCr%20Chemie&rft.date=2014&rft.volume=145&rft.issue=6&rft.spage=863-867&rft.epage=863-867&rft.eissn=0026-9247&rft.issn=0026-9247&rft.au=HEYMANN,%20Gunter&HEYING,%20Birgit&RODEWALD,%20Ute%20Ch.&CHEVALIER,%20Bernard&HUPPERTZ,%20Hubert&rft.genre=article |
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