scholarly journals AMORPHOUS-PRECURSOR MEDIATED FORMATION OF MAGNESIUM-FREE WHITLOCKITE

2021 ◽  
Vol 37 (0) ◽  
pp. 1-10
Author(s):  
Toshiisa Konishi ◽  
Sadayuki Watanabe
Keyword(s):  
Amorphous Precursor

Fabrication of Cu2ZnSnS4 thin films using a Cu-Zn-Sn-O amorphous precursor and supercritical fluid sulfurization

2017 ◽  
Vol 638 ◽  
pp. 244-250
Author(s):  
Yuta Nakayasu ◽  
Takaaki Tomai ◽  
Nobuto Oka ◽  
Kanako Shojiki ◽  
Shigeyuki Kuboya ◽  
...  
Keyword(s):  
Thin Films ◽  
Supercritical Fluid ◽  
Amorphous Precursor

The Evaluation of TiTe2 as a Diffusion Barrier in the Formation of Low Thermal Conductivity Nanolaminates with Bi2Te3 and Sb2Te3

2010 ◽  
Vol 74 ◽  
pp. 38-47
Author(s):  
Clay Mortensen ◽  
Paul Zschack ◽  
David C. Johnson
Keyword(s):  
Thermal Conductivity ◽  
Diffusion Barrier ◽  
Self Assembly ◽  
Low Temperatures ◽  
Annealing Temperature ◽  
The Self ◽  
High Angle ◽  
X Ray Diffraction ◽  
Amorphous Precursor ◽  
X Ray

The evolution of designed [(Ti-Te)]x[(Sb-Te)]y, [(Bi-Te)]x[(Sb-Te)]y, [(Ti-Te)]w[(Bi-Te)]x[(Sb-Te)]y and [(Ti-Te)]w[(Bi-Te)]x[(Ti-Te)]y[(Sb-Te)]z precursors were followed as a function of annealing temperature and time using both low and high angle x-ray diffraction techniques to probe the self assembly into nanolaminate materials. The [(Bi-Te)]x[(Sb-Te)]y precursors were found to interdiffuse at low temperatures to form a (BixSb1-x)2Te3 alloy. The [(Ti-Te)]x[(Bi-Te)]y and [(Ti-Te)]x[(Sb-Te)]y precursors formed ordered nanolaminates [{(TiTe2)}1.35]x[Bi2Te3]y and [{(TiTe2)}1.35]x[Sb2Te3]y respectively. The [(Ti-Te)]w[(Bi-Te)]x[(Sb-Te)]x precursors formed [{(TiTe2)}1.35]w[(Bi0.5Sb0.5)2Te3]2x nanolaminates on annealing, as the bismuth and antimony layers interdiffused. Over the range of TiTe2 thicknesses used in [(Ti-Te)]w[(Bi-Te)]x[(Ti-Te)]y[(Sb-Te)]z precursors, Bi and Sb were found to interdiffuse through the 2-4 nm thick Ti-Te layers, resulting in the formation of (BixSb1-x)2Te3 alloy layers as part of the final nanolaminated products. When the Bi-Te and Sb-Te thicknesses were equal in the amorphous precursors, symmetric [{(TiTe2)}1.35]m[(Bi0.5Sb0.5)2Te3]n nanolamiantes were formed. When the thicknesses of Bi-Te and Sb-Te layers were not equal in the amorphous precursor, asymmetric [(TiTe2)1.35]m[(BixSb1-x)2Te3]n[(TiTe2)1.35]m[(BixSb1-x)2Te3]p nanolaminates were formed. These results imply that to form (A)w(B)x(C)y nanolaminates using designed layered precursors all three components must be immiscible. To form (A)x(B)y(A)x(C)z nanolaminates, the components must be immiscible or the precursor to the A component and the A component itself must be an effective interdiffusion barrier preventing B and C from mixing.

Techniques for texturing ceramic superconductors from an amorphous precursor

1993 ◽  
Vol 22 (10) ◽  
pp. 1269-1274 ◽  
Author(s):  
M. J. Kramer ◽  
R. W. McCallum ◽  
L. Margulies ◽  
S. R. Arrasmith ◽  
T. G. Holesinger
Keyword(s):  
Amorphous Precursor ◽  
Ceramic Superconductors

scholarly journals Selective brookite polymorph formation related to the amorphous precursor state in TiO2 thin films

2019 ◽  
Vol 505 ◽  
pp. 109-114 ◽  
Author(s):  
John S. Mangum ◽  
Okan Agirseven ◽  
James E.S. Haggerty ◽  
John D. Perkins ◽  
Laura T. Schelhas ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Precursor ◽  
Tio2 Thin Films ◽  
Precursor State

Synthesis of ZrO2–Y6WO12 solid solution powders by a polymerized complex method

1998 ◽  
Vol 13 (4) ◽  
pp. 939-943 ◽  
Author(s):  
Junfeng Ma ◽  
Masahiro Yoshimura ◽  
Masato Kakihana ◽  
Masatomo Yashima
Keyword(s):  
Solid Solution ◽  
Crystallite Size ◽  
Surface Area ◽  
Solid Solutions ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
Complex Method ◽  
Amorphous Precursor ◽  
Fine Powders ◽  
Polymerized Complex Method

A series of solid solutions (1 − x) ZrO2 · xY0.857 W0.143 O1.714 (1/7Y6WO12) of metastable cubic phase were synthesized at 800 °C through a polymerized complex method. Lattice parameter a0 of solid solutions varies linearly with Y0.857 W0.143 O1.714 content (x). Crystallization began to occur above 400 °C from amorphous precursor to yield at 800 °C fine powders of 6–10 nm and 19–40 m2/g for crystallite size and surface area, respectively.

scholarly journals Crystallisation rates of calcite from an amorphous precursor in confinement

2013 ◽  
Vol 367 ◽  
pp. 110-114 ◽  
Author(s):  
Robert Darkins ◽  
Alexander S. Côté ◽  
Colin L. Freeman ◽  
Dorothy M. Duffy
Keyword(s):  
Amorphous Precursor

X-ray photoelectron and ion scattering spectroscopic surface analyses of amorphous and crystalline calcium phosphate nanoparticles with different chemical histories

2020 ◽  
Vol 22 (10) ◽  
pp. 5531-5547 ◽  
Author(s):  
Vuk Uskoković
Keyword(s):  
Calcium Phosphate ◽  
Atomic Layer ◽  
Hydroxyapatite Nanoparticles ◽  
Ion Scattering ◽  
Amorphous Precursor ◽  
X Ray ◽  
History Of ◽  
Calcium Phosphate Nanoparticles ◽  
History Of Formation

The surface of hydroxyapatite nanoparticles is enriched in the topmost atomic layer with calcium and depleted of it elsewhere, alongside being dependent on the history of formation of hydroxyapatite from the amorphous precursor.

scholarly journals THE CHEMICAL NATURE OF KERATOHYALIN GRANULES OF THE EPIDERMIS

1970 ◽  
Vol 47 (3) ◽  
pp. 593-603 ◽  
Author(s):  
A. Gedeon Matoltsy ◽  
Margit N. Matoltsy
Keyword(s):  
Amino Acids ◽  
Electron Microscope ◽  
Citric Acid ◽  
Column Chromatography ◽  
Chemical Nature ◽  
Newborn Rats ◽  
Amorphous Precursor ◽  
Native Form ◽  
Cell Content

Keratohyalin granules were isolated in the native form from the epidermis of newborn rats by the use of citric acid and a detergent. The isolated granules revealed a fine granular substructure in the electron microscope similar to that seen in situ. Analyses of amino acids by automated column-chromatography showed that proline and cystine are present in large proportions whereas histidine is present in a small amount. Accordingly, it was concluded that keratohyalin represents a sulfur-rich amorphous precursor of the horny cell content, rather than a sulfur-poor side product of the keratinization process, or a unique histidine-rich protein as proposed by in situ histochemical and radioautographic studies.

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