Epitaxial growth of La2Zr2O7 thin films on rolled Ni-substrates by sol–gel process for high Tc superconducting tapes

Chirayil, Thomas; Paranthaman, M.; Beach, David B.; Lee, D.F; Goyal, A.; Williams, R. K.; Cui, X.; Kroeger, D. M.; Feenstra, R.; Verebelyi, D. T.; Christen, D. K.

doi:10.1016/s0921-4534(00)00089-7

Cited by 74 publications

(32 citation statements)

References 24 publications

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“…As a route to achieving homogeneity of the final product, the solution-based approach to the synthesis of bulk superconducting materials is now well established [1][2][3][4]. By creating a homogeneous reaction mixture, the phase purity of the final product is maximised for any given material.…”

Section: Introductionmentioning

confidence: 99%

Biotemplated synthesis of superconducting plate-like YBa2Cu3O7−δ using oligosaccharides

Hall

Wimbush

Shida

et al. 2011

Chemical Physics Letters

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Section: Introductionmentioning

confidence: 99%

Biotemplated synthesis of superconducting plate-like YBa2Cu3O7−δ using oligosaccharides

Hall

Wimbush

Shida

et al. 2011

Chemical Physics Letters

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“…It is known that the buffer layers such as CeO 2 , yttriumstabilized ZrO 2 (YSZ), Y 2 O 3 , SrTiO 3 (STO), and La 2 Zr 2 O 7 (LZO) play an important role in the architecture of the YBCO-coated conductor [2][3][4]. In order to obtain YBCOcoated conductor with high critical current (I c ), buffer layers should have certain properties, including a high chemical stability, a good capability of blocking interdiffusion, and the close lattice parameter to YBCO phase [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel deposition of high-performance Re0.2Ce0.8O2/La2Zr2O7 composite buffer layers on Ni–W tapes for YBCO coated conductors

Bian

Chen

Tang

et al. 2015

J Sol-Gel Sci Technol

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Gd-, Y-, and La-doped CeO 2 films (Gd 0.2-Ce 0.8 O 2 , Y 0.2 Ce 0.8 O 2 , and La 0.2 Ce 0.8 O 2 ) are prepared on Ni-W tapes and La 2 Zr 2 O 7 -buffered Ni-W tapes using solgel method. The films are characterized by X-ray diffraction and atomic force microscopy. Results indicate that Y 0.2 Ce 0.8 O 2 (YCO) film shows the better crystallinity and the surface quality compared with Gd 0.2 Ce 0.8 O 2 (GCO) and La 0.2 Ce 0.8 O 2 (LCO) films. The YCO buffer layer has good in-plane texture with purely c-oriented grains. The YCO films deposited on La 2 Zr 2 O 7 (LZO) also demonstrate the good texture and the perfect surface quality. YBCO films are prepared on the YCO/LZO and LCO/LZO composite buffer layers through the low fluorine solution route. The YBCO film deposited on the YCO/LZO buffer layer displays a high T c of 89.6 K with a low transition temperature width (DT = 0.45 K), and a J c value of 0.5 MA/cm 2 , which is superior to that deposited on LCO/LZO buffer layer. Graphical Abstract Gd-, Y-, and La-doped CeO 2 films (Gd 0.2 Ce 0.8 O 2 , Y 0.2 Ce 0.8 O 2 , and La 0.2 Ce 0.8 O 2 ) are prepared on Ni-W tapes through sol-gel method. GCO film has a coarse surface, and the YCO film has the best texture and surface quality. Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 and La 0.2 Ce 0.8 O 2 / La 2 Zr 2 O 7 composite buffer layers are also prepared and compared. The surface quality of Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 is superior to that of La 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 composite buffer layer. High-T c YBCO films with sharp DT = 0.45 K and a J c value of 0.5 MA/cm 2 are successfully obtained on the Y 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 film, which is superior to that on La 0.2 Ce 0.8 O 2 /La 2 Zr 2 O 7 buffer layer.

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“…It is used in superconductors of the second generation as thin buffer layers since its lattice parameters match those of YBCO (0.5 %), and also because it provides a good barrier against oxygen diffusion [2,3]. Lanthanum zirconate (LZO) buffer layers are mainly prepared by the alkoxide sol-gel route [2,4], MOD [5], and CSD [3,6] methods from solutions of La and Zr organic compounds in organic solvents, for example, lanthanum isopropoxide and zirconium n-propoxide dissolved in 2-methoxyethanol [2,4] and lanthanum (III) and zirconium (IV) 2,4-pentadionate, that are transformed into respective propionate, when dissolved in the propionic acid [3,5]. Water-based solutions, containing metal acetates, acetic acid, triethanolamine, and ammonium hydroxide were proposed in order to avoid organic solvents [7].…”

Section: Introductionmentioning

confidence: 99%

Syntesis of lanthanum zirconate hydrosols by the ion exchange method

Bovina¹,

Tarasova²,

Chibirova³

2011

J. Phys.: Conf. Ser.

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Abstract. Ion exchange of LaCl 3 and ZrOCl 2 aqueous solutions with anion-exchanger AV-17-8 was used to synthesize finely dispersed hydrosol of amorphous lanthanum zirconate La 2 Zr 2 O 7 . Heat treatment of dried La 2 Zr 2 O 7 hydrosols at 700ºC and 1100ºC resulted in the formation of powders with fluorite and pyrochlore type structures, respectively. Epitaxial La 2 Zr 2 O 7 films were obtained on SrTiO 3 (001) single crystals. The substrate has an influence on the lanthanum zirconate crystal orientation, as well as strong inhibitory effect on sintering processes. IntroductionLanthanum zirconate La 2 Zr 2 O 7 has a cubic pyrochlore structure [1] and is highly thermostable. It is used in superconductors of the second generation as thin buffer layers since its lattice parameters match those of YBCO (0.5 %), and also because it provides a good barrier against oxygen diffusion [2,3]. Lanthanum zirconate (LZO) buffer layers are mainly prepared by the alkoxide sol-gel route [2,4], MOD [5], and CSD [3,6] methods from solutions of La and Zr organic compounds in organic solvents, for example, lanthanum isopropoxide and zirconium n-propoxide dissolved in 2-methoxyethanol [2,4] and lanthanum (III) and zirconium (IV) 2,4-pentadionate, that are transformed into respective propionate, when dissolved in the propionic acid [3,5]. Water-based solutions, containing metal acetates, acetic acid, triethanolamine, and ammonium hydroxide were proposed in order to avoid organic solvents [7]. We have developed the ion exchange method for synthesis of amorphous lanthanum zirconate hydrosol free from organic components. In this paper we report the synthesis route and properties of the product obtained.

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Epitaxial growth of La2Zr2O7 thin films on rolled Ni-substrates by sol–gel process for high Tc superconducting tapes

Cited by 74 publications

References 24 publications

Biotemplated synthesis of superconducting plate-like YBa2Cu3O7−δ using oligosaccharides

Biotemplated synthesis of superconducting plate-like YBa2Cu3O7−δ using oligosaccharides

Sol–gel deposition of high-performance Re0.2Ce0.8O2/La2Zr2O7 composite buffer layers on Ni–W tapes for YBCO coated conductors

Syntesis of lanthanum zirconate hydrosols by the ion exchange method

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