Cation Ordering in the Sillén X1-Type Oxychloride, BaBiO2Cl

Kennard, M.; Darriet, Jacques; Grannec, J.; Tressaud, A.

doi:10.1006/jssc.1995.1263

Cited by 19 publications

(16 citation statements)

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“…In the case of Bi 3+ , broad emission peaks, whose number and positions depend on the crystal field around the cation, and large Stokes shifts are commonly observed [1,3,4,7,20,21]. All three Sillen phases are isostructural, crystallizing in the orthorhombic space group Cmcm [13]. Each bismuth cation has C 4 v site symmetry with coordination to eight substituents (4O + 4Cl) in a square antiprismatic arrangement.…”

Section: Photoluminescencementioning

confidence: 99%

“…We present three bismuth oxyhalide phases, SrBiO 2 Cl, BaBiO 2 Cl, and BaBiO 2 Br, that exhibit such Bi 3+ luminescence. In general, the Sillen bismuth oxyhalide phases (ABi 3+ O 2 X, where A = divalent cation and X = Cl, Br, I) have garnered significant attention with interests centered around their catalytic properties [8,9] and interesting crystal structures [10][11][12][13][14][15]. This work introduces photo-and radio-luminescence properties of these three members of the Sillen bismuth oxyhalide family.…”

Section: Introductionmentioning

confidence: 99%

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Bi3+ luminescence in ABiO2Cl (A=Sr, Ba) and BaBiO2Br

Porter-Chapman¹,

Bourret-Courchesne

Derenzo³

2008

Journal of Luminescence

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Trivalent bismuth luminescence is reported in three Sillen bismuth oxyhalide phases, SrBiO 2 Cl, BaBiO 2 Cl, and BaBiO 2 Br. These compounds exhibit Bi 6s6p → 6s 2 emission under UV and X-ray radiation. At room temperature, BaBiO 2 Cl shows the most intense light emission, with spectral and decay properties similar to those found in Bi 4 Ge 3 O 12 (BGO). At low temperatures, each phase show an increase in the photoluminescence intensities and a narrowing of the emission peaks. In contrast to the temperature dependence of BGO, X-ray excited luminescence intensities of all three phases remain relatively constant throughout the temperature range 10 -295 K. This result indicates that the Sillen phases undergo less thermal quenching than BGO. The low temperature and room temperature radio-luminescence decay times were determined from pulsed xray measurements. At room temperature, SrBiO 2 Cl exhibits faster decays than BGO, while, BaBiO 2 Cl and BaBiO 2 Br have decay times similar to BGO.

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Section: Photoluminescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bi3+ luminescence in ABiO2Cl (A=Sr, Ba) and BaBiO2Br

Porter-Chapman¹,

Bourret-Courchesne

Derenzo³

2008

Journal of Luminescence

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“…Although the symmetry of the crystal cell is low [7], all the four Bi positions of c-type were found to be crystallographically and magnetically equivalent. The best agreement between the observed and simulated SEE patterns for the ν 2 transition was found for BaBiO 2 Cl at H loc = (4.5 ± 1) G and θ 1 = (50 ± 10) • (Fig.…”

Section: Resultsmentioning

confidence: 95%

Zero-field splittings of NQR spectra for bismuth(III) oxy compounds revealed by quadrupole spin echo envelopes

et al. 2007

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Local magnetic fields up to 250 G were earlier found by measuring the NQI parameters in bismuth(III) oxy compounds conventionally considered as diamagnets, a strong increase in the 209 Bi line intensities being observed in external magnetic fields. An approach based on registration of the quadrupole spin-echo envelopes enabled to reveal small (within an inhomogeneous line broadening) splittings in some other compounds of this type. The modeling of time dependence of the quadrupole spin echo amplitude indicated that modulations of the spin echo envelope in BaBiO 2 Cl and Bi 3 B 5 O 12 resulted from weak (≤5 G) local magnetic fields. By using this approach, it was found that an increase in the 209 Bi resonance intensity in external magnetic fields is related to an influence of the fields on the nuclear spin-spin relaxation rate for the appropriate compounds.

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“…In addition to our inability to introduce Cd> into #uorite-related layers (which is by all means possible in SilleH n phases), no cation ordering can be found, at least in the >2 and X2>2 structures. For the X1 SilleH n phases with composition Me''BiO Z, cation ordering seems now to be a rule rather than an exception (22,26 voids in the triple anion layer while the lead ions substitute, as usual, the Bi> ions in the #uorite-related layers. The potassium ions are too large to enter octahedral voids in the stoichiometric triple chloride anion layer; therefore, it may be supposed that the &&inner'' chlorine sublayer is also "lled incompletely, to make room for the K> ions.…”

Section: Discussionmentioning

confidence: 96%

“…A compound with the proposed cell parameters being obtained, other possible combinations of elements were tested with a stoichiometry Me'' BaBiO Cl was prepared as described in (22). BaBiO Br was prepared under the same conditions, but the reaction mixture was annealed in dynamic vacuum (0.1 Torr), to avoid oxidation.…”

Section: A Search For Y2 Compoundsmentioning

confidence: 99%