• synthesis of homogeneous (na1−xkx)nbo3 nanorods using hydrothermal and post-heat treatment processes

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 529
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     to synthesize (na1−xkx)nbo3 nanorods, the nb2o5-added (1 − y)naoh–ykoh specimens with 0.0 ⩽ ⩽ 0.9 were heated at 160 °c and subsequently annealed at 500 °c. homogeneous na-rich (na1−xkx)nbo3 nanorods were only synthesized for the specimen with y = 0.15. however, nanbo3 nanorods were formed for specimens withy < 0.15, and k-rich (na1−xkx)nbo3 nanoplates were obtained for specimens with y > 0.2. the (na8xk8−8x)nb6o19nh2o transient phase was formed in the specimen with y = 0.15 heated at 160 °c for 8.0–12.0 h, and this phase transformed into the na-rich (na1−xkx)nbo3 nanorods after annealing at 500 °c. therefore, the formation of a homogeneous (na8xk8−8x)nb6o19nh2o phase at a low temperature is very important for the synthesis of the (na1−xkx)nbo3 nanorods. the (na8xk8−8x)nb6o19nh2o phase was considerably influenced by the heating temperature, and the processing time. the na-rich (na1−xkx)nbo3 nanorods have rectangular shape with various sizes, and the growth direction of these nanorods is [0 0 1].

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