Optical properties of the (CrF6)3- complex in A 2BMF6:Cr3+ elpasolite crystals: Variation with M-F bond distance and hydrostatic pressure
| hal.structure.identifier | MALTA Consolider Team, Facultad de Ciencias | |
| dc.contributor.author | HERNANDEZ, I. | |
| hal.structure.identifier | MALTA Consolider Team, Facultad de Ciencias | |
| dc.contributor.author | RODRIGUEZ, F. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | TRESSAUD, Alain | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 0020-1669 | |
| dc.description.abstractEn | This work investigates the photoluminescence (PL) properties of the Cr 3+-doped and Cr3+-pure fluoroelpasolites along the A 2BMF6 series and as a function of pressure. In particular, we focus on the variation of the crystal-field spectrum and the associated PL. The results are explained on the basis of the octahedral (CrF6) 3- complex subjected either to external pressure or the internal pressure exerted by different crystal hosts. We have established structural correlations between the crystal-field parameter 10Dq and the Cr-F distance, RCr-F, from which we have determined the local structure around the Cr3+ impurity, allowing the host material effect on the Cr-F bonds to be studied. As salient features, we show, first, a weak dependence of the first excitation energy, E1, usually identified as 10Dq, with R Cr-F as E1 = KRCr-F-3.3, and, second, an increase of the Stokes shift upon RCr-F reduction or with increasing pressure. We associate this unusual behavior with the existence of state mixing among 4T2g(F), 2Eg(G), and 2T1g(G) states in the first excitation band of Cr 3+. Finally, high-pressure experiments performed on Rb 2KCrF6 indicate that the excited-state spin crossover, 2Eg(G) ↔ 4T2g(F), takes place around 7 GPa. The results indicate the suitability of the selected A 2BMF6:Cr3+ elpasolites to establish structural correlations between PL and RCr-F. | |
| dc.language.iso | en | |
| dc.publisher | American Chemical Society | |
| dc.subject.en | Photoluminescence | |
| dc.subject.en | Elpasolite | |
| dc.subject.en | Crystal structure | |
| dc.subject.en | Chromium | |
| dc.subject.en | Inorganic compounds | |
| dc.subject.en | Pressure | |
| dc.title.en | Optical properties of the (CrF6)3- complex in A 2BMF6:Cr3+ elpasolite crystals: Variation with M-F bond distance and hydrostatic pressure | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/ic800606h | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Inorganic Chemistry | |
| bordeaux.page | 10288-10298 | |
| bordeaux.volume | 47 | |
| bordeaux.issue | 22 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00348846 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00348846v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Inorganic%20Chemistry&rft.date=2008&rft.volume=47&rft.issue=22&rft.spage=10288-10298&rft.epage=10288-10298&rft.eissn=0020-1669&rft.issn=0020-1669&rft.au=HERNANDEZ,%20I.&RODRIGUEZ,%20F.&TRESSAUD,%20Alain&rft.genre=article |
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