Sol-Gel Synthesis of Rare Earth Aluminate Films as Buffer Layers for High Tc Superconducting Films

1997 ◽  
Vol 495 ◽  
Author(s):  
David B. Beach ◽  
Catherine E. Vallet ◽  
Mariappan Paranthaman ◽  
Eliot D. Specht ◽  
Jonathan S. Morrell ◽  
...  
Keyword(s):  
Rare Earth ◽  
Cuprate Superconductors ◽  
Sol Gel ◽  
Epitaxial Films ◽  
Solution Chemistry ◽  
Buffer Layers ◽  
High Tc ◽  
Oxide Substrates ◽  
Research Plan ◽  
Sol Gel Synthesis

ABSTRACTCubic rare-earth aluminate perovskites of the general form REAIO3 have been identified as possible buffer layers for high current carrying cuprate superconductors deposited on roll-textured metals. This paper describes on-going research to develop solution routes which would avoid the use of slow and costly vacuum processing. Our research plan includes the development of an appropriate solution chemistry, studies of the crystallization behavior of powders under reducing and oxidizing conditions, deposition of polycrystalline films on silver substrates, deposition of epitaxial films on single-crystal oxide substrates, and deposition on roll textured nickel. The method is illustrated with the example of PrAlO3.

Comparison of Several CU(I) and CU(II) Precursors for the Sol-Gel Preparation of High TC Superconducting Metal Oxides

1988 ◽  
Vol 121 ◽  
Author(s):  
Mariquita A. Accibal ◽  
Jonathan W. Draxton ◽  
Allen H. Gabor ◽  
Wayne L. Gladfelter ◽  
Beth Anne Hassler ◽  
...  
Keyword(s):  
Thin Films ◽  
Metal Oxides ◽  
Coordination Compounds ◽  
Sol Gel ◽  
High Tc ◽  
Superconducting Metal ◽  
Zero Resistance ◽  
Gel Preparation ◽  
Sol Gel Synthesis

ABSTRACTA comparison of the use of three different coordination compounds of copper as precursors for the sol-gel synthesis of YBa2Cu3O7-δ has been made. For yttrium, the tris(isopropoxide) was used exclusively, while the use of both Ba(O-i-Pr)2 and Ba(OCH2CH2OEt)2 (prepared in situ from Ba metal) as sources for Ba were studied. After dissolving Y(O-i-pr)3, a Ba source, and the copper(I) alkoxide, [Cu(O-i-Bu)]4, hydrolysis led immediately to an orange gelatinous solid which yielded YBa2Cu3O7-δ upon firing in oxygen. Copper(II) acetate was found to give heterogeneous mixtures under our conditions and was not further studied. Copper(II) acac (acac = acetylacetonate) yielded the best results. Partially hydrolyzed solutions of Cu(acac)2, Ba(OCH2CH2OEt)2, and Y(O-i-pr)3 were spin coated on SrTi03 (100) and fired under oxygen to give oriented (b axis normal to the surface) thin films of YBa2Cu3O7-δ. The onset of superconductivity for the films was 92 K, but they did not reach zero resistance until much lower temperatures.

Sol-Gel synthesis of an optical silica glass doped with rare-earth elements

2007 ◽  
Vol 33 (2) ◽  
pp. 152-155 ◽  
Author(s):  
N. N. Khimich ◽  
G. M. Berdichevskii ◽  
E. N. Poddenezhnyi ◽  
V. V. Golubkov ◽  
A. A. Boiko ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Silica Glass ◽  
Sol Gel ◽  
Sol Gel Synthesis

Sol-gel synthesis of potassium titanyl phosphate: Solution chemistry and gelation

1997 ◽  
Vol 9 (2) ◽  
pp. 183-199 ◽  
Author(s):  
Christophe J. Barbé ◽  
Mark A. Harmer ◽  
George W. Scherer
Keyword(s):  
Sol Gel ◽  
Solution Chemistry ◽  
Potassium Titanyl Phosphate ◽  
Phosphate Solution ◽  
Sol Gel Synthesis

Sol-Gel Synthesis of Epitaxial Films of (Sr,Ba)Bi2(Nb,Ta)2O9 and Bi4Ti3O12 on [100] SrTiO3

1997 ◽  
Vol 495 ◽  
Author(s):  
Jonathan S. Morrell ◽  
Ziling B. Xue ◽  
Eliot D. Specht ◽  
David B. Beach
Keyword(s):  
Spin Coating ◽  
Sol Gel ◽  
Epitaxial Films ◽  
Full Width ◽  
Lattice Constants ◽  
Plane Orientation ◽  
Pole Figures ◽  
Sol Gel Process ◽  
Out Of Plane ◽  
Sol Gel Synthesis

ABSTRACTAn all-alkoxide sol-gel process utilizing methoxyethoxide complexes in 2-methoxyethanol was used to prepare epitaxial films of SrBi2Nb2O9, SrBi2Ta2O9, BaBi2Nb2O9, BaBi2Ta2O9, and Bi4Ti3O12 on [100] oriented SrTiO3 single crystals. Films were prepared by spin coating strontium titanate substrates with partially hydrolyzed alkoxide solutions and firing in air at 850 °C for 20 minutes. Out-of-plane orientation was confirmed by θ-2θ scans which showed only [002ℓ] reflections. In-plane orientation was determined by pole figures and phi-scans about the [105] plane in the case of the (Sr,Ba)Bi2(Nb,Ta)2O9 complexes and the [117] plane in the case of Bi4Ti3O12. Lattice constants and full-width at half-maximum (fwhm) values for both in-plane and out-of-plane reflections are reported.

Sol-gel synthesis of rare-earth-doped fluoride glass thin films

1996 ◽  
Vol 11 (4) ◽  
pp. 841-849 ◽  
Author(s):  
John Ballato ◽  
Matthew Dejneka ◽  
Richard E. Riman ◽  
Elias Snitzer ◽  
Weimin Zhou
Keyword(s):  
Thin Films ◽  
Rare Earth ◽  
Sol Gel ◽  
Fluoride Glass ◽  
Silicon Substrates ◽  
Fluorescence Studies ◽  
Glass Rods ◽  
Sol Gel Films ◽  
Sol Gel Synthesis ◽  
Rare Earth Doped

This paper describes ZBLA fluoride glass thin films produced via an inexpensive, low-temperature reactive atmosphere sol-gel approach. Luminescence from erbium at 1.55 μm has been observed in x-ray-amorphous doped films deposited on calcium fluoride, polyimide, sapphire, and silicon substrates. Fluorescence studies of the erbium 4S3/2 → 4I13/2 transition, a characteristic emission for a reduced phonon energy host, were conducted for both sol-gel-derived films and conventionally prepared glass rods. The peak intensity observed from the sol-gel films was blue-shifted by 16 nm with a FWHM value approximately half that measured for the melt-quenched rods. Excitation studies indicate that, unlike conventionally prepared glasses, sol-gel materials suffer from nonradiative relaxation of the 4S3/2 excited state to the 4I9/2 level, where subsequent radiative emission to the 4I15/2 ground state occurs. The proposed source of the quenching mechanism are remnant species inherent to the sol-gel process. While this causes the luminescence behavior of rare-earth-doped sol-gel-derived fluoride materials to be similar to oxide hosts, these remnant species modify the branching ratios, resultantly leading to a novel 824 nm emission when excited at 488 nm.

Sol-gel Synthesis of LaAlO3; Epitaxial Growth of LaAlO3 Thin Films on SrTiO3(100)

1997 ◽  
Vol 12 (4) ◽  
pp. 1017-1021 ◽  
Author(s):  
Shara S. Shoup ◽  
Mariappan Paranthaman ◽  
David B. Beach ◽  
E. D. Specht ◽  
Robert K. Williams
Keyword(s):  
Ligand Exchange ◽  
Sol Gel ◽  
Precursor Solution ◽  
Epitaxial Films ◽  
Full Width ◽  
Annealing Furnace ◽  
Rocking Curve ◽  
X Ray ◽  
Sol Gel Synthesis ◽  
Hydrolysis Of

A LaAlO3 precursor solution was prepared via an all alkoxide sol-gel route. The solution of lanthanum methoxyethoxide and aluminum methoxyethoxide in 2-methoxyethanol was prepared via ligand exchange starting from lanthanum isopropoxide and aluminum sec-butoxide and was used to make both LaAlO3 powders and films. Complete hydrolysis of the solution formed a gel that yielded well-crystallized LaAlO3 powders when fired in air at 800 °C. A partially hydrolyzed solution was spun-cast on SrTiO3 (100) single crystal substrates. Epitaxial films of LaAlO3 were subsequently formed during pyrolysis in O2 at 800 °C in a rapid thermal annealing furnace for a total of 8 min. The films were strongly c-axis oriented, verified by x-ray rocking curve results from the (003) plane with full-width at half-maximum (FWHM) = 0.87°, and had good in-plane texture shown by a φ scan of the (202) plane with FWHM = 1.07°.

Multifunctional Role of Rare Earth Doping in Optical Materials: Nonaqueous Sol–Gel Synthesis of Stabilized Cubic HfO2Luminescent Nanoparticles

ACS Nano ◽  
2013 ◽  
Vol 7 (8) ◽  
pp. 7041-7052 ◽  
Author(s):  
Alessandro Lauria ◽  
Irene Villa ◽  
Mauro Fasoli ◽  
Markus Niederberger ◽  
Anna Vedda
Keyword(s):  
Rare Earth ◽  
Optical Materials ◽  
Sol Gel ◽  
Rare Earth Doping ◽  
Sol Gel Synthesis

Transition metal (Mn) and rare earth (Nd) di-doped novel ZnO nanoparticles: a facile sol–gel synthesis and characterization

2018 ◽  
Vol 29 (15) ◽  
pp. 13077-13086 ◽  
Author(s):  
A. Albert manoharan ◽  
R. Chandramohan ◽  
K. Deva Arun Kumar ◽  
S. Valanarasu ◽  
V. Ganesh ◽  
...  
Keyword(s):  
Rare Earth ◽  
Transition Metal ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Synthesis And Characterization ◽  
Sol Gel Synthesis

Rare-earth doped (Lu0.85Y0.15)2SiO5 nanocrystalline powders obtained by polymer assisted sol–gel synthesis

2010 ◽  
Vol 45 (3-6) ◽  
pp. 475-477 ◽  
Author(s):  
Željka Antić ◽  
Radenka Krsmanović ◽  
Milena Marinović-Cincović ◽  
Miodrag Mitrić ◽  
Miroslav D. Dramićanin
Keyword(s):  
Rare Earth ◽  
Sol Gel ◽  
Nanocrystalline Powders ◽  
Sol Gel Synthesis ◽  
Rare Earth Doped
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