Pechini process
A process related to the
The Pechini method was proposed in 1967 as a technique of depositing dielectric films of titanates and niobates of lead and alkaline-earth elements in the production of capacitors. Later, the process was customised for the in-lab synthesis of multicomponent finely dispersed oxide materials.[3][4]
Pechini process
This method has been used for synthesizing over 100 mixed metal oxides including lanthanum manganite for solid oxide fuel cells and BaTiO3 (Lessing 1989).[5] Unlike the sol–gel process in which the metal alkoxide participates in the gel-forming reactions this process is based on a gelation reaction between the alcohol and acid used as solvents. A polymeric resin containing a good distribution of cations is obtained which yields the oxide upon calcination. The use of polyacrylic acid with higher functionality results in highly cross-linked resins containing a more uniform distribution of the reacting cations. The gel structures can be varied depending on the acid-to-alcohol ratio. A low organic content is preferred to decrease the calcination time and temperature in order to obtain fine-grained materials with low carbon contents.[6][7]
References
- .
- ^ Thomas O. Mason (2016). "Encyclopedia Britannica". Advanced Ceramics.
- ^ "Pechini method".
- ISSN 0032-5910.
- .
- ^ Kumta, P.N. (2001). Encyclopedia of Materials: Science and Technology (Second ed.). p. 6588.
- ^ Aluska do Nascimento Simões Braga; Rosiane Maria da Costa Farias; Danubia Lisbôa Costa; Gelmires Araújo Neves; Hélio de Lucena Lira; Romualdo Rodrigues Menezes (2012). "Synthesis of Mullite by the Pechini Method". Materials Science Forum. 820: 107–112.