Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1-xThxNbO4+ x 2 and LaNb1-xWxO4+ x 2

R. J. Cava; R. S. Roth; T. Negas; H. S. Parker; D. B. Minor

doi:10.1016/0022-4596(81)90398-4

Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La_1-xTh_xNbO_{4+ x 2} and LaNb_1-xW_xO_{4+ x 2}

R. J. Cava, R. S. Roth, T. Negas, H. S. Parker, D. B. Minor

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

For La_1-xTh_xNbO_{4+ x 2}, three phases with broad homogeneity regions occur, for 0.075 ≤ x ≤ 0.37, 0.41 < x < 0.61, and 0.65 ≤ x ≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb_1-xW_xO_{4+ x 2} for 0.11 ≤ x ≤ 0.22. Additional phases occur at La_0.2Th_0.8NbO_4.4 and LaNb_0.4W_0.6O_4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La_1-xTh_xNbO_{4+ x 2} phase with 0.075 ≤ x ≤ 0.37.

Original language	English (US)
Pages (from-to)	318-329
Number of pages	12
Journal	Journal of Solid State Chemistry
Volume	40
Issue number	3
DOIs	https://doi.org/10.1016/0022-4596(81)90398-4
State	Published - Dec 1981
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

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@article{f118db59cd264ae290bfdd6500461c43,

title = "Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1-xThxNbO4+ x 2 and LaNb1-xWxO4+ x 2",

abstract = "For La1-xThxNbO4+ x 2, three phases with broad homogeneity regions occur, for 0.075 ≤ x ≤ 0.37, 0.41 < x < 0.61, and 0.65 ≤ x ≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb1-xWxO4+ x 2 for 0.11 ≤ x ≤ 0.22. Additional phases occur at La0.2Th0.8NbO4.4 and LaNb0.4W0.6O4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La1-xThxNbO4+ x 2 phase with 0.075 ≤ x ≤ 0.37.",

author = "Cava, {R. J.} and Roth, {R. S.} and T. Negas and Parker, {H. S.} and Minor, {D. B.}",

year = "1981",

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doi = "10.1016/0022-4596(81)90398-4",

language = "English (US)",

volume = "40",

pages = "318--329",

journal = "Journal of Solid State Chemistry",

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publisher = "Academic Press Inc.",

number = "3",

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T1 - Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La1-xThxNbO4+ x 2 and LaNb1-xWxO4+ x 2

AU - Cava, R. J.

AU - Roth, R. S.

AU - Negas, T.

AU - Parker, H. S.

AU - Minor, D. B.

PY - 1981/12

Y1 - 1981/12

N2 - For La1-xThxNbO4+ x 2, three phases with broad homogeneity regions occur, for 0.075 ≤ x ≤ 0.37, 0.41 < x < 0.61, and 0.65 ≤ x ≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb1-xWxO4+ x 2 for 0.11 ≤ x ≤ 0.22. Additional phases occur at La0.2Th0.8NbO4.4 and LaNb0.4W0.6O4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La1-xThxNbO4+ x 2 phase with 0.075 ≤ x ≤ 0.37.

AB - For La1-xThxNbO4+ x 2, three phases with broad homogeneity regions occur, for 0.075 ≤ x ≤ 0.37, 0.41 < x < 0.61, and 0.65 ≤ x ≤ 0.74. All are related to the scheelite structure type, with at least the first exhibiting an incommensurate structural modulation. An analogous structurally modulated phase was found for LaNb1-xWxO4+ x 2 for 0.11 ≤ x ≤ 0.22. Additional phases occur at La0.2Th0.8NbO4.4 and LaNb0.4W0.6O4.3. The electrical conductivity and the direction and wavelength of the structural modulation have been characterized for the La1-xThxNbO4+ x 2 phase with 0.075 ≤ x ≤ 0.37.

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ER -

Crystal chemistry, modulated structure, and electrical conductivity in the oxygen excess scheelite-based compounds La_1-xTh_xNbO_{4+ x 2} and LaNb_1-xW_xO_{4+ x 2}

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