Synthesis of a novel langanite-type compound La3Al5.5Nb0.5O14 by the sol-gel process |
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Authors: | Xiqing Zhang Fapeng Yu Xiulan Duan Xuzhong Shi Shiyi Guo |
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Affiliation: | State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Ji’nan 250100, PR China |
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Abstract: | Langanite (La3Ga5.5Nb0.5O14, LGN) and its isomorphs are a few piezoelectric materials which have the unique temperature compensation and piezoelectric properties. But the high Ga2O3 content makes them very expensive and limits their applications. We reported a new langanite-type compound La3Al5.5Nb0.5O14 (LAN) which has the advantage of no Ga2O3 content. Chemically homogeneous La3Al5.5Nb0.5O14 sol was synthesized using La (NO3)3·6H2O, Al (NO3)3·9H2O and niobium citrate as starting materials. Single-phased LAN powder was prepared by decomposition of a citrate polymer precursor and subsequent reactions at high temperatures. TG-DTA, XRD and FTIR were employed to investigate the transformation process of gel to LAN powder. The results showed that, after calcination at 900 °C, pure La3Al5.5Nb0.5O14 polycrystalline powder with a narrow particle size distribution was obtained, which has the same structure with La3Ga5.5Nb0.5O14. |
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Keywords: | La3Al5 5Nb0 5O14 La3Ga5 5Nb0 5O14 Piezoelectric materials Citrate sol-gel method |
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