Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Lucas, François; Jaulmes, S.; Quarton, M.; Mercier, Thierry Le; Guillen, F.; Fouassier, C.

doi:10.1006/jssc.1999.8616

Cited by 76 publications

(38 citation statements)

References 23 publications

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“…In recent years, a series of alumino-borate compounds have been structurally characterized: K 2Al2B2O7 [1] and MAl2B2O7 with M = Ca [2], Sr [3] and Ba [4][5][6]. A new alumino-borate BaAlBO 3F2 has been investigated in [7], using Rietveld refinement of powder X-ray data and suggested to be isostructural with BaGaBO 3 F 2 .…”

Section: Discussionmentioning

confidence: 99%

Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material

Hu¹,

Maramatsu²,

Kanehisa³

et al. 2003

Zeitschrift Für Kristallographie - New Crystal Structures

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AlBBaF2O3, hexagonal, P6 (No. 174), a = 4.8879(6) Å, c = 9.403(1) Å, V = 194.5 Å 3 , Z = 2, Rgt(F) = 0.024, wR obs (F 2 ) = 0.036, T = 296 K. Source of materialCrystals of the title compound were grown by the spontaneous nucleation method from NaF flux. The starting materials BaF 2, Al 2O3, B2O3 and NaF were mixed in the appropriate ratio, then heated in a platinum crucible by using a vertical cylindrical electric furnace until they were completely melted . The temperature was decreased at a rate of 1 K/h from the saturation temperature. After 2 days, the solution was cooled to room temperature at a rate of 30 K/h. Small crystals for X-ray determination were obtained by mechanic fragmentation. Experimental detailsIn a preliminary study, the structure was refined in the space group P6 3 (No. 173). But, the R-values (R1 = 0.061 and wR2 = 0.083) were significantly larger that those in the present refinement. Moreover, the refinement resulted in unusual B-O distances. Also, a refinement in space group P3 failed. Finally, it was stablished that the correct space group is P6. A new alumino-borate BaAlBO 3F2 has been investigated in [7], using Rietveld refinement of powder X-ray data and suggested to be isostructural with BaGaBO 3 F 2 . According to this report, the BaAlBO 3F2 compound crystallizes in the hexagonal system with space group P6 3/m, Z = 2, and a = 4.882(1) Å, c = 9.398(1) Å, Rwp = 0.222, c2 = 2.59. The structure of BaAlBO 3 F 2 was studied in detail by X-ray analysis on single crystal in our group and we found that BaAlBO 3F2 has a non-centrosymmetric structure. The structure is composed of (001) layers of corner-sharing AlO 3F2 symmetric trigonal bipyramids and BO3 triangles. Ba cations are housed in the two dimensional (Al 3B3O6F6) frameworks as shown in both figures. The layers are repeating alternatively (···ABAB···). Co-planar BO 3 groups are normal to the c axis, but the turn of the BO 3 groups has a small divergence in neighboring layers and the B-O bond lengths are different 1.369(4) Å and 1.376(4) Å. In the AlO 3F2 symmetric trigonal bipyramids, all Al atoms and O atoms lie in the same plane normal to the c axis. The Al-F bond lengths are 1.917(4) Å and 1.751(6) Å. The structure has some similarities with that of the nonlinear optical crystal KBe 2BO3F2 (KBBF) [8], which reveals the shortest vacuum ultraviolet second harmonic generation output (184.7 nm) [9]. KBBF crystal consisted of corner-sharing BO 3 group where all B and O atoms lie in the same plane normal to the c axis and tetrahedral BeO 3 F group, Be atoms are alternately above and below the plane at a distance of 0.5792(4) Å. Discussion

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Section: Discussionmentioning

confidence: 99%

Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material

Hu¹,

Maramatsu²,

Kanehisa³

et al. 2003

Zeitschrift Für Kristallographie - New Crystal Structures

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“…MacDowell found two crystalline forms with low thermal expansion coefficients and indexed their X-ray patterns on the basis of a cubic and a hexagonal unit cell [11]. More recently SrAl 2 B 2 O 7 was proposed as a non-linear optical material and the rhombohedra structure of SrAl 2 B 2 O 7 is described from the (BO 3 ) 1 planes perpendicular to the original axis being linked alternatively by Al-O-Al bridges and Sr atoms [12,13]. The strontium atoms in centrosymmetric structure of SrAl 2 B 2 O 7 located between double layers composed of AlO 4 tetrahedra and BO 3 triangles, in large cavities formed by six oxygen atoms at the vertices of an octahedron and six more distant oxygen atoms also with an octahedral arrangement.…”

Section: Introductionmentioning

confidence: 98%

Eu3+ emission in SrAl2B2O7 based phosphors

Yang

Ren

Tao

et al. 2009

Current Applied Physics

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“…ions in KABO are simultaneously replaced by one X 2? (X = Ca, Sr, Ba) ion, the compounds with crystal formula of XAl 2 B 2 O 7 (X = Ca, Sr, Ba) are obtained [6][7][8], of which the structure with an inversion center (space group R-3c) was found for XAl 2-B 2 O 7 (X = Ca, Sr), while the noncentrosymmetric structure (space group R32) was known only for BaAl 2 B 2 O 7 (BABO). The calculated second harmonic generation (SHG) coefficients for BABO are about twice as large as those of KABO [9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

Chen

Chang

et al. 2014

J Chem Crystallogr

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A new sodium strontium aluminoborate, NaSr 7 AlB 18 O 36 , has been synthesized by high-temperature solution reaction at 860°C. Its crystal structure was established by single-crystal X-ray diffraction technique: the space group R " 3c (No. 167), cell parameters a = 11.356(2) Å , c = 36.655 (7) Å , V = 4093.7(12) Å 3 , and Z = 6. It is isostructural with Sr 8 MgB 18 O 36 and the crystal structure consists of the cyclic B 18 O 36 18-building unit of corner-sharing twelve BO 3 triangles and six BO 4 tetrahedra. Each B 18 O 36 18-group is bonded to six octahedrally coordinated Al 3? centers via Al-O bonds to generate a 3D 3 1 [Al(B 18 O 36 )] 15-framework that has intersecting open channels occupied by Sr 2? /Na ? cations.The IR spectrum has further confirmed that the compound contains low symmetric BO 3 and BO 4 groups; UV-Vis diffuse reflectance spectrum revealed an optical band gap of about 3.65 eV; while solid-state fluorescence spectrum exhibited a broad emission band with the emitted main peak localized at about 533.3 nm and shoulder at 420 nm upon excitation by laser of 325 nm.

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Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Cited by 76 publications

References 23 publications

Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material

Reinvestigation of the crystal structure of barium aluminum borate difluoride, BaAlBO3F2, a new nonlinear optical material

Eu3+ emission in SrAl2B2O7 based phosphors

Synthesis, Crystal Structure, and Spectrum Properties of a New Quaternary Borate NaSr7AlB18O36 with the Cyclic B18O36 18− Group, Notation of 6 × (3[2Δ + 1T])

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