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Sol–gel synthesis, solid sintering, and thermal stability of single‐phase YCoO 3
Author(s) -
Feng Guanlin,
Xue Yanfeng,
Shen Hongzhi,
Feng Shuo,
Li Liang,
Zhou Jing,
Yang Hang,
Xu Dapeng
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201127710
Subject(s) - sintering , materials science , orthorhombic crystal system , thermal stability , phase (matter) , differential thermal analysis , analytical chemistry (journal) , sol gel , thermal , oxygen , single phase , mineralogy , chemical engineering , composite material , crystal structure , crystallography , nanotechnology , chemistry , thermodynamics , diffraction , chromatography , optics , physics , organic chemistry , engineering , electrical engineering
Using Y(NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O as the starting materials, the single‐phase YCoO 3 has been synthesized by a two‐step process involving a sol–gel technique and a sintering method. The structure, electromagnetic properties, and thermal stability of the synthesized samples were measured by XRD, thermogravimmetry and differential thermal analysis (TG–DTA), TEM, and vibration sample magnetometer (VSM). The experimental results show that the synthesis conditions of the single‐phase YCoO 3 are 900–950 °C for 10 h in air. And the synthesis temperature is extended to 900–1000 °C and the sintering time is shortened to 5 h in an oxygen atmosphere. The synthesized powders have orthorhombic structure, with a diameter of ∼30 nm, which is stable in air below 1050 °C and in oxygen atmosphere below 1100 °C. Above those temperatures, YCoO 3 decomposes into Y 2 O 3 and Co 3 O 4 .