Changes in crystal phases and morphologies of rare earth hydroxide nitrates with ionic radius

Fumiya SATO; Hitoshi SHIOKAI; Yusuke YANO; Masatoshi SUGIURA; Ryoji TAKAHASHI

doi:10.2109/jcersj2.17072

Feature: The 55th Symposium on Basic Science of Ceramics: Full papers

Changes in crystal phases and morphologies of rare earth hydroxide nitrates with ionic radius

Fumiya SATO, Hitoshi SHIOKAI, Yusuke YANO, Masatoshi SUGIURA, Ryoji TAKAHASHI

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Keywords: Rare earth hydroxide nitrate, Hydrothermal synthesis, Ionic radius, Morphology, Crystal phases

JOURNAL FREE ACCESS

2017 Volume 125 Issue 10 Pages 737-741

DOI https://doi.org/10.2109/jcersj2.17072

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Abstract

Rare earth hydroxide nitrates are prepared from rare earth nitrates by hydrothermal treatment. Three crystal phases, M(OH)₃ (M1), M₂(OH)_5.14(NO₃)_0.86·H₂O (M2), and M₄O(OH)₉NO₃ (M4) are identified. The crystal phase systematically changes from M1 to M4 through M2 with decreasing radius of rare earth cation. Morphology of nanocrystal depends on the crystal phase. M1 and M4 phases grow to be nanorod, and M2 to nanoplate.

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