UV-excited piezo-optical effects in oxide nanocrystals incorporated into PMMA matrices
✍ Scribed by S. Tkaczyk; M. Galceran; S. Kret; M.C. Pujol; M. Aguiló; F. Díaz; A.H. Reshak; I.V. Kityk
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 526 KB
- Volume
- 56
- Category
- Article
- ISSN
- 1359-6454
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✦ Synopsis
Measurements of UV-laser stimulated piezo-optical effects were conducted on nanocrystals (NC) of several double tungstate materials such as Ln 3+ :KYb(WO 4 ) 2 (Ln = Eu and Er) and KGd(WO 4 ) 2 immersed in poly(methyl methacrylate) (PMMA) matrices. At the same time, similar measurements were performed on KNd(PO 3 ) 4 and KTiOPO 4 NC for comparison. The NC were synthesized by a modified Pechini method with maximum calcination temperatures of 973-1173 K. It was established that the incorporation of NC with a large dispersion of sizes and substantial aggregation favors UV-induced piezo-optical effects which are dependent only on the content of the NC being optimal at 10-12% in weighting units. The measured piezo-optical dependences are related to the chemical content of the compounds that form the NC studied.