Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 87, Issue 4, Pages 662-669Publisher
WILEY
DOI: 10.1111/j.1551-2916.2004.00662.x
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Ceramic samples of the melilite-type La1+xSr1-xGa3O7-delta (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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