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Morphology‐Controlled Synthesis and Characterization of Sr 2 Nb 2 O 7 Nanocrystalline Powders by a Hydrothermal Process
Author(s) -
Lin Botao,
Ma Junfeng,
Yao Yan,
Liu Jun,
Ren Yang,
Jiang Xiaohui,
Sun Yong,
Liu Zhensen
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.02258.x
Subject(s) - nanocrystalline material , hydrothermal circulation , nanorod , materials science , hydrothermal synthesis , morphology (biology) , characterization (materials science) , chemical engineering , phase (matter) , ultraviolet , analytical chemistry (journal) , mineralogy , nuclear chemistry , nanotechnology , chemistry , optoelectronics , organic chemistry , biology , engineering , genetics , chromatography
Nanostructured Sr 2 Nb 2 O 7 powders with different morphologies were synthesized via a hydrothermal reaction at 200°C for 24 h in a Sr 2+ –Nb 2 O 5 · n H 2 O–KOH system. X‐ray powder diffraction characterization indicated that 0.3–5 M KOH solutions favored the formation of a Sr 2 Nb 2 O 7 pure phase. On increasing the concentration of KOH from 0.3 to 5 M , the morphology of Sr 2 Nb 2 O 7 samples changed from nanoneedles to nanorods, nanosheets, and finally nano‐sized flakes, and their aspect ratios gradually reduced. Ultraviolet–Visible diffuse reflectance spectra analyses showed that the nanostructured Sr 2 Nb 2 O 7 powders had good light absorption properties in the ultraviolet light region.