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Synthesis of [10Ῑ]‐Oriented (Na 1− x K x )NbO 3 Platelets by Using Hydrothermally Produced (K 8−8 x Na 8 x )Nb 6 O 19 · n H 2 O Precursor
Author(s) -
Xu HaiBo,
Seo InTae,
Hwang BoHee,
Lee TaeGon,
Park SuJin,
Kim BoYun,
Oh Joonhak,
Nahm Sahn
Publication year - 2016
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/jace.14037
Subject(s) - annealing (glass) , materials science , hydrothermal circulation , mineralogy , natural bond orbital , platelet , analytical chemistry (journal) , ceramic , hydrothermal synthesis , crystallography , chemistry , chemical engineering , composite material , chromatography , density functional theory , computational chemistry , engineering , immunology , biology
Micrometer size [10 1 ¯ ] (N 1− x K x )NbO 3 ( NKN ) platelets were synthesized by annealing (K 8−8 x Na 8 x )Nb 6 O 19 · n H 2 O ( KNNH ) precursors at 500°C. The plate‐like KNNH precursors were produced from (1− y )NaOH‐ y KOH + Nb 2 O 5 specimens using the hydrothermal process at 160°C. The size of the NKN platelets was similar to that of the KNNH precursor, but the surfaces of the NKN platelets were rough while the KNNH precursor had a smooth surface. The formation of a rough surface is related to the vigorous evaporation of the H 2 O from the KNNH platelets during the annealing process at high temperatures. NKN platelets with smooth surfaces could be synthesized using KNNH platelets, which were heated to 150°C to evaporate H 2 O before annealing at 500°C. These NKN platelets can be used for the fabrication of textured NKN ceramics.