Author
S. Block
Bio: S. Block is an academic researcher. The author has contributed to research in topics: Strontium. The author has an hindex of 1, co-authored 1 publications receiving 119 citations.
Topics: Strontium
Papers
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124 citations
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TL;DR: The Ferroelectric Ba0.27Sr0.75Nb2O5.78 as discussed by the authors is a tungsten bronze-type structure crystallizing in the tetragonal system, with lattice constants a = 12.43024
Abstract: Ferroelectric Ba0.27Sr0.75Nb2O5.78, with Tc = 348° ± 15°K, is a tungsten bronze‐type structure crystallizing in the tetragonal system, with lattice constants a = 12.43024 ± 0.00002 and c = 3.91341 ± 0.00001 A at 298°K, space group P4bm, and five formulas in the unit cell. The integrated intensities of 6781 structure factors were measured with PEXRAD, 875 symmetry‐independent structure factors being significantly above background. The metal‐atom positions were determined from the three‐dimensional Patterson function and the oxygen atoms from subsequent Fourier series. The final agreement factor between measured and calculated structure factors is 0.0508. The structure consists of close‐packed slightly puckered layers of oxygen atoms separated by nearly c / 2. The Nb atoms are slightly displaced from one layer, the Ba and Sr atoms from the other and in the same sense. The oxygen atoms in the Ba and Sr layer are disordered. Neither of the two independent sites occupied by the Ba and Sr atoms is fully filled....
570 citations
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196 citations
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TL;DR: In this paper, the luminescence of SrB4O7:Bi consists of an orange and a blue emission and the former is ascribed to Bi2+ (6s26p) in view of a comparison with the spectra of Tl0 and Pb+ and the influence of some preparative conditions.
128 citations
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TL;DR: In this article, high optical quality crystals of strontium tetraborate SrB 4 O 7 (SBO) have been grown by the Kyropoulos method and the structure of SBO has also been determined.
113 citations
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TL;DR: The nonlinear optical properties of strontium and lead tetraborate are investigated in this paper, showing that the effective nonlinear coefficient and surface optical damage threshold of the SBO is higher than for any borate crystals.
110 citations