Effects of PtO2 and CeO2 additives on the microstructures of the quenched melts of Y-Ba-Cu-O materials

Riches, J.D., Alarco, J.A., & Barry, J.C. (2000) Effects of PtO2 and CeO2 additives on the microstructures of the quenched melts of Y-Ba-Cu-O materials. Physica C : Superconductivity and its Applications, 336(1), pp. 43-56.

View at publisher


The microstructures of the quenched melts of samples of Y123 and Y123+15-20 mol% Y211 with PtO2 and CeO2 additives have been examined with optical microscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectrometry (EDS) and X-ray Diffractometry (XRD). Significantly higher temperatures are required for the formation of dendritic or lamellar eutectic patterns throughout the samples with PtO2 and CeO2 additives as compared to samples without additives. The BaCuO2 (BCl) phase appears first in solid form and, instead of rapidly melting, is slowly dissolving or decomposing in the oxygen depleted melt. PtO2 and CeO2 additives slow down or shift to higher temperatures the dissolution or decomposition process of BCl. A larger fraction of BCl in solid form explains why samples with additives have higher viscosities and hence lower diffusivities than samples without additives. There is also a reduction in the Y solubility to about half the value in samples without additives. The mechanism that limits the Ostwald ripening of the Y211 particles is correlated to the morphology of the quenched partial melt. It is diffusion controlled for a finely mixed morphology and interface-controlled when the melt quenches into dendritic or lamellar eutectic patterns. The change in the morphology of the Y211 particles from blocky to acicular is related to an equivalent undercooling of the Y-Ba-Cu-O partial melt, particularly through the crystallization of BCl.

Impact and interest:

9 citations in Scopus
Search Google Scholar™
10 citations in Web of Science®

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

ID Code: 64050
Item Type: Journal Article
Refereed: Yes
Additional Information: Cited By (since 1996):7 Export Date: 5 November 2013 Source: Scopus CODEN: PHYCE Language of Original Document: English Correspondence Address: Riches, J.D.; Univ of Queensland, Queensland References: Pavuna, D., Berger, H., Tholence, J.-L., Affronte, M., Sanjines, R., Dubas, A., Bugnon, P., Vasey, F., (1988) Physica C, 153-155, p. 1339; Singh, J.P., Leu, H.J., Poeppel, R.B., Van Voorhees, E., Goudey, G.T., Winsley, K., Shi, D., (1989) J. Appl. Phys., 66, p. 3154; McGinn, P., Zhu, N., Chen, W., Lanagan, M., Balachandran, U., (1990) Physica C, 167, p. 343; Goyal, A., Funkenbusch, P.D., Kroeger, D.M., Burns, S.J., (1991) Physica C, 182, p. 203; Jin, S., Tiefel, T.H., Sherwood, R.C., Davis, M.E., Van Dover, R.B., Kammlott, G.W., Fastnacht, R.A., Keith, H.D., (1988) Appl. Phys. Lett., 52, p. 2074; Jin, S., Tiefel, T.H., Sherwood, R.C., Van Dover, R.B., Davis, M.E., Kammlott, G.W., Fastnacht, R.A., (1988) Phys. Rev. B, 37, p. 7850; Ogawa, N., Hirabayashi, I., Tanaka, S., (1991) Physica C, 177, p. 101; Murakami, M., Morita, M., Doi, K., Miyamoto, K., (1989) Jpn. J. Appl. Phys., 28, p. 1189; Chow, J.C.L., Leung, H.-T., Lo, W., Cardwell, D.A., (1998) Supercond. Sci. Technol., 11, p. 369; Delamare, M.P., Monot, I., Wang, J., Provost, J., Desgardin, G., (1996) Supercond. Sci. Technol., 9, p. 534; Durand, L., Dierickx, D., Regnier, P., Van Der Biest, O., Poissonnet, S., (1996) Supercond. Sci. Technol., 9, p. 290; Lee, H.-G., Park, J.-H., Song, J.-T., (1995) J. Am. Ceram. Soc., 78, p. 1980; Ogawa, N., Yoshida, M., Hirabayashi, I., Tanaka, S., (1992) Supercond. Sci. Technol., 5, p. 89; Varanasi, C., McGinn, P.J., (1993) Physica C, 207, p. 79; Varanasi, C., McGinn, P.J., Pavate, V., Kvam, E.P., (1994) Physica C, 221, p. 46; Kim, C.-J., Kim, K.-B., Hong, G.-W., (1994) Physica C, 232, p. 163; Kim, C.-J., Kim, K.-B., Hong, G.-W., (1995) J. Mater. Res., 10, p. 1605; Vilalta, N., Sandiumenge, F., Pinol, S., Obradors, X., (1997) J. Mater. Res., 12, p. 38; Romano, L.T., Schilling, O.F., Grovenor, C.R.M., (1991) Physica C, 178, p. 41; Kim, C.-J., Lai, S.H., McGinn, P.J., (1994) Mater. Lett., 19, p. 185; McGinn, P., Chen, W., Zhu, N., Tan, L., Varanasi, C., Sengupta, S., (1991) Appl. Phys. Lett., 59, p. 120; Kim, C.-J., Kuk, I.-H., Hong, G.-W., Sung, T.-H., Han, S.-C., Kim, J.-J., (1998) Mater. Lett., 34, p. 392; Izumi, T., Nakamura, Y., Sung, T.-H., Shiohara, Y., (1992) J. Mater. Res., 7, p. 801; Riches, J.D., Alarco, J.A., Barry, J.C., (1998) Supercond. Sci. Technol., 11, pp. 963-967; Riches, J.D., Alarco, J.A., Yamashita, T., Barry, J.C., (1998) Supercond. Sci. Technol., 11, pp. 830-836; Riches, J.D., Alarco, J.A., Barry, J.C., (1999) Physica C, 312, pp. 21-27; Alarco, J.A., Olsson, E., Golden, S.J., Bhargava, A., Yamashita, T., Barry, J., Mackinnon, I.D.R., (1997) J. Mater. Res., 12, pp. 624-635; Alarco, J.A., Riches, J.D., Yamashita, T., Nakon, D., Williams, B., Talbot, P., Barry, J.C., Mackinnon, I.D.R., (1998) Mater. Sci. Eng., B, 53, pp. 138-142; Lide, D.R., (1998) CRC Handbook of Chemistry and Physics, , Boca Raton: CRC Press; Wegmann, M.R., Lewis, J.A., Platt, C.E., (1994) J. Appl. Phys., 75, pp. 5218-5226; Alarco, J.A., Ilyushechkin, A., Yamashita, T., Bhargava, A., (1999) Mater. Sci. Eng., B, , in press; Griffith, M.L., Huffmann, R.T., Halloran, J.W., (1994) J. Mater. Res., 9, pp. 1633-1643; Aselage, T., Keefer, K., (1988) J. Mater. Res., 3, pp. 1279-1291; Wong-Ng, W., Cook, L.P., (1994) J. Am. Ceram. Soc., 77, pp. 1883-1888; Alarco, J.A., Riches, J.D., Barry, J.C., (1999), in preparationWang, J., Monot, I., Delamare, M.P., Desgardin, G., (1997) J. Mater. Sci., 32, pp. 409-413; Ehlers, E.G., (1972) The Interpretation of Geological Phase Diagrams, , San Francisco: W.H. Freeman; Izumi, T., Nakamura, Y., Shiohara, Y., (1993) J. Mater. Res., 8, pp. 1240-1246; Haasen, P., (1986) Physical Metallurgy, , Cambridge: Cambridge Univ. Press; Philpotts, A.R., (1990) Principles of Igneous and Metamorphic Petrology, , New Jersey: Prentice Hall; Lofgren, G., (1974) Am. J. Sci., 274, pp. 243-273; Kirkpatrick, R.J., (1974) Am. J. Sci., 274, pp. 215-242
Keywords: Additives, Cerium compounds, Composition effects, Crystal microstructure, Diffusion, High temperature superconductors, Molten materials, Morphology, Platinum compounds, Solubility, Viscosity, Yttrium barium copper oxides, Ostwald ripening, Oxide superconductors
DOI: 10.1016/S0921-4534(00)00025-3
ISSN: 0921-4534
Divisions: Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 06 Nov 2013 23:42
Last Modified: 06 Nov 2013 23:42

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page