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La1+xSr1–xGa3O7–δ Melilite-Type Ceramics - Preparation, Composition, and Structure

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Ceramic samples of the melilite-type La1+xSr1–xGa3O7–δ (x=−0.15 to 0.60) compound were prepared by conventional ceramic processing. Sintering characteristics and microstructural evolution were studied. A phase diagram study was performed to establish the solid solubility limits as a function of the La:Sr ratio. Structural investigations of the Dalton composition as well as strontium- and lanthanum-rich samples entailed X-ray, neutron, and electron diffraction techniques at ambient and elevated temperatures. The homogeneity region was remarkably broad (x=−0.15 to 0.60) with no changes in space group observed. A small shrinkage of the unit cell was found with increased lanthanum content. Phase transitions at ambient and intermediate temperatures did not occur.
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Keywords: chemical properties; melilite; solubility

Document Type: Research Article

Affiliations: Pulvermetallurgisches Laboratorium, Max-Planck-Institut für Metallforschung, D-70569 Stuttgart, Germany

Publication date: April 1, 2004

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