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Thermal expansion in solid solution Er2−xSmxW3O12

✍ Scribed by M.M. Wu; J. Peng; Y.Z. Cheng; X.L. Xiao; Y.M. Hao; Z.B. Hu

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
190 KB
Volume
137
Category
Article
ISSN
0921-5107

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✦ Synopsis

The crystal structural and thermal expansion properties of solid solution Er 2-x Sm x W 3 O 12 (0 x 2.0) have been investigated by X-ray powder diffraction. The XRD patterns indicate that pure phases can form in the composition range of 0.0 x 0.5 with orthorhombic structure and 0.6 x 2.0 with monoclinic one. The cell parameters and unit cell volumes increase almost linearly with increasing Sm content. Investigations on the thermal properties show that compounds with 0.0 x 0.5 exhibit negative thermal expansion in the 200-800 • C temperature range and samples with 0.6 x 2.0 possess normal thermal expansion (25-800 • C). It is also found that high samarium content leads to more negative thermal expansion coefficient of Er 2-x Sm x W 3 O 12 (0.0 x 0.5).

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