Synthesis of the new layered oxides NaRbLnMO5 (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

Ronaldo J. Cavazos; Raymond E. Schaak

doi:10.1016/j.materresbull.2004.04.014

Synthesis of the new layered oxides NaRbLnMO₅ (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

Ronaldo J. Cavazos, Raymond E. Schaak

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Abstract

The new layered transition metal oxides NaRbLnMO₅ (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO₅ crystallizes with a tetragonal unit cell [a = 5.839(6)Å, c = 8.313(1)Å] analogous to that of the related compound NaKLaNbO₅, while NaRbLaTaO₅ indexes to a larger monoclinic unit cell [a = 9.577(2)Å, b = 5.834(1)Å, c = 8.323(2)Å, β = 93.00(2)]. NaRbLnNbO₅ can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO₅ can be prepared for Ln = Nd, Sm. Both series of compounds show the expected decrease in unit cell volume as the size of the lanthanide decreases. NaRbLaNbO₅ is also amenable to ion exchange, forming Li_2-xRb_xLaNbO₅ upon reaction with molten lithium nitrate.

Original language	English (US)
Pages (from-to)	1209-1214
Number of pages	6
Journal	Materials Research Bulletin
Volume	39
Issue number	9
DOIs	https://doi.org/10.1016/j.materresbull.2004.04.014
State	Published - Jul 2 2004

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.materresbull.2004.04.014

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@article{ec6c514ee11440c6b11f7e4fff132ebb,

title = "Synthesis of the new layered oxides NaRbLnMO5 (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)",

abstract = "The new layered transition metal oxides NaRbLnMO5 (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO5 crystallizes with a tetragonal unit cell [a = 5.839(6){\AA}, c = 8.313(1){\AA}] analogous to that of the related compound NaKLaNbO5, while NaRbLaTaO5 indexes to a larger monoclinic unit cell [a = 9.577(2){\AA}, b = 5.834(1){\AA}, c = 8.323(2){\AA}, β = 93.00(2)]. NaRbLnNbO5 can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO5 can be prepared for Ln = Nd, Sm. Both series of compounds show the expected decrease in unit cell volume as the size of the lanthanide decreases. NaRbLaNbO5 is also amenable to ion exchange, forming Li2-xRbxLaNbO5 upon reaction with molten lithium nitrate.",

author = "Cavazos, {Ronaldo J.} and Schaak, {Raymond E.}",

note = "Funding Information: The authors thank Dr. Nattamai Bhuvanesh for help with X-ray diffraction measurements. This work was supported by start-up funds from Texas A&M University. ",

year = "2004",

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doi = "10.1016/j.materresbull.2004.04.014",

language = "English (US)",

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T1 - Synthesis of the new layered oxides NaRbLnMO5 (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

AU - Cavazos, Ronaldo J.

AU - Schaak, Raymond E.

N1 - Funding Information: The authors thank Dr. Nattamai Bhuvanesh for help with X-ray diffraction measurements. This work was supported by start-up funds from Texas A&M University.

PY - 2004/7/2

Y1 - 2004/7/2

N2 - The new layered transition metal oxides NaRbLnMO5 (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO5 crystallizes with a tetragonal unit cell [a = 5.839(6)Å, c = 8.313(1)Å] analogous to that of the related compound NaKLaNbO5, while NaRbLaTaO5 indexes to a larger monoclinic unit cell [a = 9.577(2)Å, b = 5.834(1)Å, c = 8.323(2)Å, β = 93.00(2)]. NaRbLnNbO5 can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO5 can be prepared for Ln = Nd, Sm. Both series of compounds show the expected decrease in unit cell volume as the size of the lanthanide decreases. NaRbLaNbO5 is also amenable to ion exchange, forming Li2-xRbxLaNbO5 upon reaction with molten lithium nitrate.

AB - The new layered transition metal oxides NaRbLnMO5 (Ln = Nd, Sm, Eu, Gd; M = Nb, Ta) were synthesized by direct solid-state reaction. NaRbLaNbO5 crystallizes with a tetragonal unit cell [a = 5.839(6)Å, c = 8.313(1)Å] analogous to that of the related compound NaKLaNbO5, while NaRbLaTaO5 indexes to a larger monoclinic unit cell [a = 9.577(2)Å, b = 5.834(1)Å, c = 8.323(2)Å, β = 93.00(2)]. NaRbLnNbO5 can be prepared for Ln = Nd, Sm, Eu, Gd, and NaRbLnTaO5 can be prepared for Ln = Nd, Sm. Both series of compounds show the expected decrease in unit cell volume as the size of the lanthanide decreases. NaRbLaNbO5 is also amenable to ion exchange, forming Li2-xRbxLaNbO5 upon reaction with molten lithium nitrate.

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Synthesis of the new layered oxides NaRbLnMO₅ (Ln = La, Nd, Sm, Eu, Gd; M = Nb, Ta)

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