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Nano–Nano Composite Powders of Lanthanum Zirconate and Yttria‐Stabilized Zirconia by Spray Pyrolysis
Author(s) -
Jiang Kuo,
Liu Songbai,
Li Chuanchao
Publication year - 2013
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.12470
Subject(s) - yttria stabilized zirconia , materials science , grain size , grain growth , annealing (glass) , cubic zirconia , composite number , chemical engineering , nano , atmospheric temperature range , microstructure , lanthanum , composite material , ceramic , mineralogy , analytical chemistry (journal) , inorganic chemistry , chemistry , physics , chromatography , meteorology , engineering
Powders composing of La 2 Zr 2 O 7 ( LZ ) and ( Zr 0.8 Y 0.2 ) O 1.9 (10 YSZ ) phases (volume ratio = 1:1) were synthesized by using a sol‐spray pyrolysis method. The effects of annealing temperature on the grain size and lattice parameter of the LZ –10 YSZ powders were investigated. XRD results showed that the grain size of LZ and 10 YSZ phases gradually grew from 10 to 95 nm and from 5 to 65 nm as the annealing temperature elevated from 900°C to 1200°C. The relative decreasing percentage of grain size comparing to that of the single‐phase LZ and 10 YSZ powders were in the range 9%–36% and 37%–86%. The activation energy for grain growth of LZ and 10 YSZ phases in the composite powders were 225 ± 12 and 382 ± 17 kJ/mol, which were 20% and 183% higher than that of the single‐phase counterparts. Obvious lattice contraction and lattice expansion for LZ and 10 YSZ phases were observed at temperatures below 1100°C, respectively. SEM results revealed that LZ and 10 YSZ phases were homogeneously distributed in the sintered bulk. The TEM results suggested that the grain growth was affected by the interaction on nanometer length scales of grain boundaries between LZ and 10 YSZ phases in the composite.