التفاصيل البيبلوغرافية
| العنوان: |
Synthesis of anisometric KNbO3and K0.5Na0.5NbO3single crystals by chemical conversion of non-perovskite templates. |
| المؤلفون: |
Francesco Madaro, Julian R. Tolchard, Yingda Yu, Mari-Ann Einarsrud, Tor Grande |
| المصدر: |
CrystEngComm; Feb2011, Vol. 13 Issue 5, p1350-1359, 10p |
| مصطلحات موضوعية: |
CRYSTALS, PEROVSKITE, CHEMICAL templates, POLYCRYSTALLINE semiconductors, OSTWALD ripening, PRECIPITATION (Chemistry) |
| مستخلص: |
KNbO3(KN) and K1−xNaxNbO3(KNN) anisometric crystals have been produced by a chemical conversion route. Crystals of the compounds K4Nb6O17, K2Nb4O11and KNb3O8with high aspect ratio were first grown in molten KCl. The non-perovskite compounds were further converted to KN or KNN perovskites by reaction with K2CO3or Na2CO3at 800 °C with or without the presence of molten KCl. Through a dissolution–precipitation mechanism needle- or plate-like KNN and KN particles with high aspect ratios were formed with preferred orientation along the [011] or [100] directions. A short reaction time was observed to yield complete chemical conversion to polycrystalline KN/KNN, while single crystals with the morphology resembling the non-perovskite templates were obtained after longer reaction time by Ostwald ripening. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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