Epitaxial Film Growth of Single Crystal Ce/V Prepared by Molecular-Beam Epitaxy

1986 ◽  
Vol 77 ◽  
Author(s):  
Hitoshi Homma ◽  
Kai-Y. Yang ◽  
Ivan K. Schuller
Keyword(s):  
Single Crystal ◽  
Film Growth ◽  
High Energy ◽  
Epitaxial Films ◽  
X Ray ◽  
X Ray Scattering ◽  
Crystal Film ◽  
Epitaxial Film Growth ◽  
First Time

ABSTRACTThe growth of epitaxial films of cerium (Ce)/vanadium (V)/on single crystal sapphires (α-A1203) was studied by in-situ reflection high energy electron diffraction and x-ray scattering. For the first time Ce(111) single crystal film was grown on V(110)/α-A12O3 (1120) in the Frank-van der Merwe mode. A new epitaxial orientation, different from the well known Nishiyama-Wasserman or Kurdjumov-Sachs orientations is found in the present study. Subsequent V(110) layers grow epitaxially with three equivalent domains.

In-Situ Synchrotron X-Ray Scattering Study of Thin Film Growth by Atomic Layer Deposition

2011 ◽  
Vol 11 (2) ◽  
pp. 1577-1580 ◽  
Author(s):  
Yong Jun Park ◽  
Dong Ryeol Lee ◽  
Hyun Hwi Lee ◽  
Han-Bo-Ram Lee ◽  
Hyungjun Kim ◽  
...  
Keyword(s):  
Thin Film ◽  
Atomic Layer Deposition ◽  
Film Growth ◽  
Atomic Layer ◽  
Thin Film Growth ◽  
X Ray ◽  
X Ray Scattering ◽  
Layer Deposition ◽  
Scattering Study

scholarly journals Raman Spectroscopy and Single-Crystal High-Temperature Investigations of Bentorite, Ca6Cr2(SO4)3(OH)12·26H2O

Minerals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 38
Author(s):  
Rafał Juroszek ◽  
Biljana Krüger ◽  
Irina Galuskina ◽  
Hannes Krüger ◽  
Martina Tribus ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Temperature ◽  
Single Crystal ◽  
Chemical Formula ◽  
Crystal Chemical Formula ◽  
Single Crystal Diffraction ◽  
Bending Vibrations ◽  
X Ray ◽  
First Time

The crystal structure of bentorite, ideally Ca6Cr2(SO4)3(OH)12·26H2O, a Cr3+ analogue of ettringite, is for the first time investigated using X-ray single crystal diffraction. Bentorite crystals of suitable quality were found in the Arad Stone Quarry within the pyrometamorphic rock of the Hatrurim Complex (Mottled Zone). The preliminary semi-quantitative data on the bentorite composition obtained by SEM-EDS show that the average Cr/(Cr + Al) ratio of this sample is >0.8. Bentorite crystallizes in space group P31c, with a = b = 11.1927(5) Å, c =21.7121(10) Å, V = 2355.60(18) Å3, and Z = 2. The crystal structure is refined, including the hydrogen atom positions, to an agreement index R1 = 3.88%. The bentorite crystal chemical formula is Ca6(Cr1.613Al0.387)Σ2[(SO4)2.750(CO3)0.499]Σ3.249(OH)11.502·~25.75H2O. The Raman spectra of bentorite from two different localities exhibit the presence of the main stretching and bending vibrations related to the sulfate group at 983 cm−1 (ν1), 1109 cm−1 (ν3), 442 cm−1 (ν2), and 601 cm−1 (ν4). Moreover, the presence of bands assigned to the symmetric Cr(OH)63− stretching mode and hydroxyl deformation vibrations of Cr–OH units at ~540 cm−1 and ~757 cm−1, respectively, may be used to distinguish between ettringite and bentorite. In situ high temperature single crystal XRD experiments show that the decomposition of bentorite starts at ca. 45 °C and that a dehydroxylation product similar to metaettringite is formed.

Formation of hydroxysulphate and hydroxycarbonate green rusts in the presence of zinc using time-resolved in situ small and wide angle X-ray scattering

2008 ◽  
Vol 72 (1) ◽  
pp. 159-162 ◽  
Author(s):  
I. A. M. Ahmed ◽  
S. Shaw ◽  
L. G. Benning
Keyword(s):  
Unit Cell ◽  
Wide Angle ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Ph Dependent ◽  
Green Rusts ◽  
First Time ◽  
Ray Scattering

AbstractThe formation and transformation of hydroxysulphate (GRSO4) and hydroxycarbonate (GRCO3) Green Rusts were studied in situ using synchrotron-based time-resolved small and wide angle X-ray scattering. The time-resolved data revealed, for the first time, the pH dependent transition from poorly-ordered schwertmannite (pH <6.5) into GRSO4 (pH ~6.8) followed by GRCO3 (at pH ~9.6). These data also showed that the addition of Zn to the starting sulphate Fe2+/Fe3+ solution resulted in a change in size of the GR unit-cell due to substitution of Zn into the GR structure.

The Structures of Polynuclear Th(IV) Hydrolysis Products

2006 ◽  
Vol 986 ◽  
Author(s):  
Richard E. Wilson ◽  
S. Skanthakumar ◽  
L. Soderholm
Keyword(s):  
Single Crystal ◽  
High Energy ◽  
Thermodynamic Quantities ◽  
Polynuclear Complexes ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Hydrolysis Products ◽  
Insight Into ◽  
Ray Scattering

AbstractThe hydrolysis chemistry of the tetravalent actinides is discussed based on recent studies with thorium. The coupling of high energy x-ray scattering and single crystal diffraction has provided insight into the structures of the polynuclear complexes formed by hydrolytic reactions of the tetravalent actinides. The success of these experiments with thorium presents many opportunities for the elucidation of the structures and thermodynamic quantities describing the dissolved polynuclear complexes of the heavier actinides.

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