Preparation and characterization of lanthanum zirconate

Nair, Jalajakumari; Nair, Padmakumar; Doesburg, E.B.M.; Ommen, J.G. van; Ross, J.R.H.; Burggraaf, A.J.; Mizukami, Fujio

doi:10.1023/a:1004496100596

Cited by 56 publications

(32 citation statements)

References 9 publications

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“…This confirms strong effect of the textured substrate on process of formation of the La 2 Zr 2 O 7 epitaxial film. The La 2 Zr 2 O 7 formation processes in the sol synthesis by the ion exchange method developed in the present work and those in the coprecipitation method [11,12] are close. In both cases crystallization of lanthanum zirconate occurs during the heat treatment at temperatures above 600 °C (the structure of fluorite) and ≥1000°C (the structure of pyrochlore).…”

Section: Methodssupporting

confidence: 55%

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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Section: Methodssupporting

confidence: 55%

Syntesis of lanthanum zirconate hydrosols by the ion exchange method

Bovina¹,

Tarasova²,

Chibirova³

2011

J. Phys.: Conf. Ser.

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“…Different methods, including solid-state reaction, solution routes using organic and inorganic precursors, and hydrothermal synthesis [5,[13][14][15], can be used to prepare LZ with various sizes, morphologies and crystalline properties. The coprecipitation-calcination method [16] is an easy, effective method to obtain tiny precursor particles that are needed for fabricating TBCs with a fine structure and a low thermal diffusivity.…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation synthesis and thermal conductivity of La2Zr2O7

Chen

Gao

Liu

et al. 2009

Journal of Alloys and Compounds

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“…An increase in pore diameter due to ethanol washing has also been observed (17). This model may also be used to explain the difference in peptizability between refluxed samples and washed samples.…”

Section: Mechanism Of Peptizationmentioning

confidence: 75%