Effects of diffusion of Co/Ni cations on sol-gel derived ZrO{sub 2} polymorphic transformations

Book · Tue Dec 31 00:00:00 EST 1996

OSTI ID:479332

Zeng, H C; Qian, M ^[1]

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1. National Univ. of Singapore (Singapore). Dept. of Chemical Engineering

Transition metal incorporated ZrO{sub 2} gel matrices have been prepared by impregnation method and investigated with FTIR/DTA/XRD. The metastable tetragonal-monoclinic-tetragonal-cubic phase transformations are revealed in the DTA heating process up to 1,400 C for the studied gels. High-temperature tetragonal to monoclinic transition is also observed in the cooling process. It is found that the diffusing metal cations stabilize the low-temperature tetragonal phase. However, for high-temperature (900 C) calcined gels, both as-prepared and metal-stabilized tetragonal phases are reduced substantially. Correlations between metal diffusion and gel polymorphic stabilities are also demonstrated.

• OSTI ID: 479332
• Report Number(s): CONF-951155-; ISBN 1-55899-301-0; TRN: 97:010474
• Resource Relation: Conference: Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 27 Nov - 1 Dec 1995; Other Information: PBD: 1996; Related Information: Is Part Of Thermodynamics and kinetics of phase transformations; Im, J.S. [ed.] [Columbia Univ., New York, NY (United States)]; Park, B. [ed.] [Georgia Inst. of Tech., Atlanta, GA (United States)]; Greer, A.L. [ed.] [Cambridge Univ. (United Kingdom)]; Stephenson, G.B. [ed.] [Argonne National Lab., IL (United States)]; PB: 697 p.; Materials Research Society symposium proceedings, Volume 398
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SOL-GEL PROCESS
PHASE TRANSFORMATIONS
ZIRCONIUM OXIDES
COBALT ADDITIONS
NICKEL ADDITIONS
DIFFERENTIAL THERMAL ANALYSIS
DIFFUSION
CRYSTAL LATTICES
EXPERIMENTAL DATA