AEM investigation of tetrahedrally coordinated Ti{sup 4+} in nickel-titanate spinel

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Stoichiometry and site distribution of metastable nickel-titanate spinel was studied with AEM. Results of EDXS and EELS agree that the metastable spinel is nonstoichiometric and titanium-deficient relative to its hypothetical endmember composition, ``Ni{sub 2}TiO{sub 4}``. The titanium deficiency has been determined by EELS to be {Delta} = 0.025 {plus_minus} 0.005. Channeling-enhanced microanalysis and ELNES studies indicate that the Ti{sup 4+} and Ni{sup 2+} cations are in tetrahedral and octahedral coordination, respectively, so that the metastable spinel has the normal cation distribution: Ti{sub l-{Delta}}[Ni{sub 2(1+{Delta})}]O{sub 4}. This is consistent with neutron powder-diffraction studies and SiO{sub 2}-solubility measurements of similar equilibrated and ... continued below

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7 p.

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Anderson, I.M.; Bentley, J. & Carter, C.B. December 31, 1994.

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  • Anderson, I.M. Minnesota Univ., Minneapolis, MN (United States). Dept. of Chemical Engineering and Materials Science
  • Bentley, J. Oak Ridge National Lab., TN (United States)
  • Carter, C.B. Minnesota Univ., Minneapolis, MN (United States). Dept. of Chemical Engineering and Materials Science

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Stoichiometry and site distribution of metastable nickel-titanate spinel was studied with AEM. Results of EDXS and EELS agree that the metastable spinel is nonstoichiometric and titanium-deficient relative to its hypothetical endmember composition, ``Ni{sub 2}TiO{sub 4}``. The titanium deficiency has been determined by EELS to be {Delta} = 0.025 {plus_minus} 0.005. Channeling-enhanced microanalysis and ELNES studies indicate that the Ti{sup 4+} and Ni{sup 2+} cations are in tetrahedral and octahedral coordination, respectively, so that the metastable spinel has the normal cation distribution: Ti{sub l-{Delta}}[Ni{sub 2(1+{Delta})}]O{sub 4}. This is consistent with neutron powder-diffraction studies and SiO{sub 2}-solubility measurements of similar equilibrated and quenched spinel-containing specimens. Metastable nickel-titanate spinel therefore contrasts with stable stoichiometric spinels which tend to the inverse cation distribution, Me[MeTi]O{sub 4}.

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7 p.

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OSTI as DE95006624

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 29 Nov - 3 Dec 1993

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  • Other: DE95006624
  • Report No.: CONF-931108--113
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 27054
  • Archival Resource Key: ark:/67531/metadc669904

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  • December 31, 1994

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 1:56 p.m.

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Anderson, I.M.; Bentley, J. & Carter, C.B. AEM investigation of tetrahedrally coordinated Ti{sup 4+} in nickel-titanate spinel, article, December 31, 1994; Tennessee. (digital.library.unt.edu/ark:/67531/metadc669904/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.