Doping of Alkaline Earth Halide Single Crystals

1964 ◽  
Vol 111 (8) ◽  
pp. 1009 ◽  
Author(s):  
P. F. Weller ◽  
J. E. Scardefield
Keyword(s):  
Single Crystals ◽  
Alkaline Earth

Intrinsically modified thermoelectric performance of alkaline-earth isovalently substituted [Bi2AE2O4][CoO2]y single crystals

2013 ◽  
Vol 114 (4) ◽  
pp. 043705 ◽  
Author(s):  
N. Sun ◽  
S. T. Dong ◽  
B. B. Zhang ◽  
Y. B. Chen ◽  
J. Zhou ◽  
...  
Keyword(s):  
Single Crystals ◽  
Alkaline Earth ◽  
Thermoelectric Performance

Über das Erdalkalimetall-Lanthanoid-Kupfer-Oxomolybdat (Cu0,22Mg0 ,78)BaNd2Mo4O16/The Alkaline Earth Rare Earth Copper-Oxomolybdate (Cu0.22Mg0.78)BaNd2Mo4O16

1995 ◽  
Vol 50 (4) ◽  
pp. 577-580 ◽  
Author(s):  
H. Szillat ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Three Dimensional ◽  
Space Group ◽  
X Ray ◽  
Ray Methods

Single crystals of (Cu0.22Mg0.78)BaNd2Mo4O16 have been prepared by crystallization from melts and investigated by X-ray methods. The compound crystallizes monoclinically, space group C62h - C12/c1, Z = 4, a = 5.351(1), b = 12.891(2), c = 19.391(4) Å,β = 90.899(14)° and is isotypic to CuKHo2Mo4O16. The crystal structure is dominated by BaO10 and NdO8 polyhedra forming a three-dimensional polyhedra network, which is filled by axially distorted (Cu,Mg)O6 octahedra and MoO4 tetrahedra.

scholarly journals Synthese und Kristallstruktur eines Alkali-Erdalkali-Kupfer-Halogeno-Oxovanadats: KBaCuV2O7Cl / Synthesis and Crystal Structure of an Alkaline Alkaline-Earth Halide Oxide of Copper and Vanadium: KBaCuV2O7Cl

1994 ◽  
Vol 49 (3) ◽  
pp. 355-359 ◽  
Author(s):  
F.-D. Martin ◽  
H. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Copper Ion ◽  
Tetragonal Symmetry ◽  
Synthesis And Crystal Structure ◽  
Space Group ◽  
X Ray ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of KBaCuV2O7Cl have been prepared by a flux technique and investigated by X-ray analysis. The compound crystallizes with tetragonal symmetry, space group C24v-P4 bm, a = 8.8581, c = 5.4711 Å, Z = 2. The crystal structure shows Cu2+ within a one sided strongly distorted CuO4Cl2 octahedron. The copper ion is shifted towards the nearer Cl- neighbour to form a CuO4Cl square pyramid. Two VO4 tetrahedra are connected to give stretched V2O7 double tetrahedra, and linked in planes via the oxygen corners of the CuO4Cl pyramids. The crystal structure and the structure of the complex BaO8Cl2 polyhedron are discussed.

Die Kristallstrukturen der isotypen Erdalkalimetall-Nitridowolfra- mat(VI)-Nitrid-Oxide Ca51[WN4]12N8O3 und Sr51[WN4]12N8O3 / The Crystal Structures of the Isotypic Alkaline Earth-Nitridotungstate(VI)- Nitride-OxidesCa51[WN4]12N8O3 and Sr51[WN4]12N8O3

1997 ◽  
Vol 52 (11) ◽  
pp. 1349-1358 ◽  
Author(s):  
Peter Höhn ◽  
Matthias Ludwig ◽  
Rüdiger Kniep
Keyword(s):  
Single Crystals ◽  
Crystal Structures ◽  
Alkaline Earth ◽  
Molar Ratio ◽  
Oxide Ions

Yellow single crystals of the isotypic phases Ca51[WN4]12N8O3 and Sr51[WN4] 12N8O3 (triclinic, P1̄ (#2 ); a= 1056.4(3) / 1113.1(5) pm, b = 1239.7(3) / 1304.4(5) pm, c= 1598.2(3) / 1679.4(9) pm, α = 102.78(1)/102.47(2)°, β= 95.15( 1)/95.43(3)°, γ = 109.89(1)/109.77(2)°; Z = 1) were grown in a Tl-flux (Ca:Tl, molar ratio 5:1, W-crucible; Tmax = 1273K; reaction with N2, 1 atm, 36 h) or from pellets (Sr2N + W, molar ratio 6:1; Tmax = 1023K; reaction with N2, 1 atm, 36 h). The crystal structures contain tetrahedral anions [WN4]6- in addition to isolated nitride and isolated oxide ions, which are octahedrally coordinated by Ca and Sr, respectively.

scholarly journals Über das gemischte Alkali-Erdalkalimetall-Oxoruthenat NaSr3RuO6 / The Mixed Alkaline Alkaline Earth Oxoruthenate NaSr3RuO6

1995 ◽  
Vol 50 (4) ◽  
pp. 581-584 ◽  
Author(s):  
S. Frenzen ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Partial Replacement ◽  
X Ray ◽  
Group D ◽  
Symmetry Space ◽  
Related Compounds ◽  
Symmetry Space Group ◽  
Rhombohedral Symmetry

Single crystals of NaSr3RuO6 have been prepared in closed silver tubes and investigated by X-ray techniques. This compound crystallizes with trigonal (rhombohedral) symmetry, space group D63d - R3̅c , a = 9.6069(8), c = 11.513(2) Å, Z = 6, and is isotypic to compounds of the Sr4PtO6 type. The crystal structure is discussed with respect to related compounds with partial replacement of alkaline earth elem ents by sodium and copper.

scholarly journals Slow and Sustained Release of Carbonate Ions from Amino Acids for Controlled Hydrothermal Growth of Alkaline-Earth Carbonate Single Crystals

ACS Omega ◽  
2020 ◽  
Vol 5 (23) ◽  
pp. 14123-14132
Author(s):  
Huayao Xia ◽  
Mengyuan Zhou ◽  
Xiangru Wei ◽  
Xiangcheng Zhang ◽  
Zhangxiong Wu
Keyword(s):  
Amino Acids ◽  
Sustained Release ◽  
Single Crystals ◽  
Alkaline Earth ◽  
Hydrothermal Growth ◽  
Carbonate Ions

scholarly journals Samarium doped alkaline earth halides as red-emitting scintillators and phosphors

2021 ◽  
Author(s):  
◽  
Laura Catherine Dixie
Keyword(s):  
Single Crystals ◽  
Decay Time ◽  
Alkaline Earth ◽  
Radiation Detection ◽  
Red Emission ◽  
X Ray ◽  
Decay Times ◽  
Integrated Intensity ◽  
Imaging Resolution ◽  
Alkaline Earth Halides

<p>This thesis is concerned with the manufacture, spectroscopic characterisation, and radiation detection performance of three rare earth doped alkaline earth halides; these were designed for scintillation or phosphor detection of x-rays and γ-rays. The materials are transparent polycrystals of lanthanum or praseodymium stabilised cubic barium chloride ((La,Pr)₀.₁₂₅Ba₀.₈₇₅Cl₂.₁₂₅), BaCl₂ - SrCl₂ solid solutions, or single crystals of CaF₂. The primary dopant investigated was Sm²⁺ since this has a red emission in all the materials which is well matched to the spectral sensitivity of silicon photodiodes. The cubic structure of the polycrystalline materials is essential for optical transparency, and so the structural stability of the materials has been investigated using x ray diffraction and thermal analysis. For CaF₂ large single crystals were unintentionally produced without following the usual Bridgman-Stockbarger or Czochralski methods. All of the materials showed predominantly Sm²⁺ ions, and only in CaF₂ could evidence of Sm³⁺ ions also be seen.  The spectroscopy of the 4f⁵5d¹ → 4f⁶ red emission, including lifetimes, and absorption of Sm²⁺ ions in all these materials is reported; a strong thermal cross over to 4f⁶ → 4f⁶ emission is observed and successfully modelled. A time correlated single photon counted system has been built to measure the scintillation decay time of these materials. The system yields decay times in excellent agreement with the literature values. The performance of the materials as scintillators is limited to varying degrees by the formation of colour centres which slow the electron-hole recombination process after x-irradiation. Ba₀.₃Sr₀.₇Cl₂:Sm was found to be a bright and fast x-ray phosphor. The integrated intensity (per x-ray half thickness of material) of the radioluminescence is ~ 30 % that of the commercial material, the scintillation lifetime is ~ 30 μs (c.f. milliseconds for Gd₂O₂S:Tb³⁺) and the imaging resolution is 6 LP/mm (c.f. 4.2 LP/mm for Gd₂O₂S:Tb³⁺). CaF₂:Sm²⁺ was shown to be a red-emitting scintillator with a decay time of ≤ 1 μs and a light output of 15,000 photons/MeV when cooled by dry ice. The x-ray imaging resolution was high at 8.5 LP/mm. Several of the materials have been tested for performance as neutron detecting phosphors by adding neutron capture elements such as gadolinium or lithium, the strongest emission observed was 6 % the integrated intensity of the standard material ⁶LiI(Eu²⁺).</p>

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