Phase relations in the pseudobinary systems RAO3-R2Ti2O7 (R: rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A1−xTix)O3+x/2 (2/3≤x≤3/4) at elevated temperatures in air

Francisco Brown, Ivan Jacobo-Herrera, Victor Alvarez-Montaño, Noboru Kimizuka, Keiji Kurashina, Yuichi Michiue, Yoji Matsuo, Shigeo Mori, Naoshi Ikeda, Felipe Medrano

Research output: Contribution to journalArticle

Abstract

Phase relations in the pseudo-binary systems RFeO3-R2Ti2O7 (R: Lu, Ho and Dy), RGaO3-R2Ti2O7 (R: Lu and Er), LuAlO3-Lu2Ti2O7 and RAO3-R2Ti2O7 (R: Lu and Yb. A: Cr and Mn) at elevated temperatures in air were determined by means of a classic quenching method. There exist Lu(Fe1−xTix)O3+x/2, R(Ga1−xTix)O3+x/2 (R: Lu and Er) and Lu(Al1−xTix)O3+x/2 (2/3≤ x≤3/4) having the Yb(Fe1−xTix)O3+x/2-type of crystal structure (x=0.72, space group: R3m, a(Å)=17.9773 and c(Å)=16.978 as a hexagonal setting) in these pseudo binary systems. Eighteen compounds R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) were newly synthesized and their lattice constants as a hexagonal setting were measured by means of the X-ray powder diffraction method. The R occupies the octahedral site and both A and Ti does the trigonalbipyramidal one in these compounds. Relation between lattice constants for the rhombic R(A1−xTix)O3+x/2 and the monoclinic In(A1−xTix)O3+x/2 are as follows, ah≈5 x bm, ch≈3 x cm x sin β and am=31/2 x bm, where ah and ch are the lattice constants as a hexagonal setting for R(A1−xTix)O3+x/2 and am, bm, cm and β are those of the monoclinic In(A1−xTix)O3+x/2. Crystal structural relationships among α-InGaO3 (hexagonal, high pressure form, space group: P63/mmc), InGaO3 (rhombic, hypothetical), (RAO3)n(BO)m and RAO3(ZnO)m (R: Lu-Ho, Y and In, A: Fe, Ga, and Al, B: divalent cation element, m, n: natural number), the orthorhombic-and monoclinic In(A1−xTix)O3+x/2 (A: Fe, Ga, Al, Cr and Mn) and the hexagonal-and rhombic R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) are schematically presented. We concluded that the crystal structures of both the α-InGaO3 (high pressure form, hexagonal, space group: P63/mmc) and the hypothetical InGaO3 (rhombic) are the key structures for constructing the crystal structures of these compounds having the cations with CN=5.

Original languageEnglish
Pages (from-to)131-142
Number of pages12
JournalJournal of Solid State Chemistry
Volume251
DOIs
Publication statusPublished - Jul 1 2017

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Rare earth elements
Lattice constants
rare earth elements
Crystal structure
crystal structure
air
synthesis
Air
Positive ions
cations
Divalent Cations
X ray powder diffraction
Temperature
temperature
Cations
Quenching
quenching
Crystals
diffraction
crystals

Keywords

  • Composite crystal structure
  • In(FeTi)O
  • InGaO(ZnO) (m: natural number)
  • R(ATi)O (R: rare earth element and Y, A: Fe, Ga and Al)
  • The system RAO-RTiO
  • Yb(FeTi)O

ASJC Scopus subject areas

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

Cite this

Phase relations in the pseudobinary systems RAO3-R2Ti2O7 (R : rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A1−xTix)O3+x/2 (2/3≤x≤3/4) at elevated temperatures in air. / Brown, Francisco; Jacobo-Herrera, Ivan; Alvarez-Montaño, Victor; Kimizuka, Noboru; Kurashina, Keiji; Michiue, Yuichi; Matsuo, Yoji; Mori, Shigeo; Ikeda, Naoshi; Medrano, Felipe.

In: Journal of Solid State Chemistry, Vol. 251, 01.07.2017, p. 131-142.

Research output: Contribution to journalArticle

Brown, Francisco ; Jacobo-Herrera, Ivan ; Alvarez-Montaño, Victor ; Kimizuka, Noboru ; Kurashina, Keiji ; Michiue, Yuichi ; Matsuo, Yoji ; Mori, Shigeo ; Ikeda, Naoshi ; Medrano, Felipe. / Phase relations in the pseudobinary systems RAO3-R2Ti2O7 (R : rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A1−xTix)O3+x/2 (2/3≤x≤3/4) at elevated temperatures in air. In: Journal of Solid State Chemistry. 2017 ; Vol. 251. pp. 131-142.
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title = "Phase relations in the pseudobinary systems RAO3-R2Ti2O7 (R: rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A1−xTix)O3+x/2 (2/3≤x≤3/4) at elevated temperatures in air",
abstract = "Phase relations in the pseudo-binary systems RFeO3-R2Ti2O7 (R: Lu, Ho and Dy), RGaO3-R2Ti2O7 (R: Lu and Er), LuAlO3-Lu2Ti2O7 and RAO3-R2Ti2O7 (R: Lu and Yb. A: Cr and Mn) at elevated temperatures in air were determined by means of a classic quenching method. There exist Lu(Fe1−xTix)O3+x/2, R(Ga1−xTix)O3+x/2 (R: Lu and Er) and Lu(Al1−xTix)O3+x/2 (2/3≤ x≤3/4) having the Yb(Fe1−xTix)O3+x/2-type of crystal structure (x=0.72, space group: R3m, a({\AA})=17.9773 and c({\AA})=16.978 as a hexagonal setting) in these pseudo binary systems. Eighteen compounds R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) were newly synthesized and their lattice constants as a hexagonal setting were measured by means of the X-ray powder diffraction method. The R occupies the octahedral site and both A and Ti does the trigonalbipyramidal one in these compounds. Relation between lattice constants for the rhombic R(A1−xTix)O3+x/2 and the monoclinic In(A1−xTix)O3+x/2 are as follows, ah≈5 x bm, ch≈3 x cm x sin β and am=31/2 x bm, where ah and ch are the lattice constants as a hexagonal setting for R(A1−xTix)O3+x/2 and am, bm, cm and β are those of the monoclinic In(A1−xTix)O3+x/2. Crystal structural relationships among α-InGaO3 (hexagonal, high pressure form, space group: P63/mmc), InGaO3 (rhombic, hypothetical), (RAO3)n(BO)m and RAO3(ZnO)m (R: Lu-Ho, Y and In, A: Fe, Ga, and Al, B: divalent cation element, m, n: natural number), the orthorhombic-and monoclinic In(A1−xTix)O3+x/2 (A: Fe, Ga, Al, Cr and Mn) and the hexagonal-and rhombic R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) are schematically presented. We concluded that the crystal structures of both the α-InGaO3 (high pressure form, hexagonal, space group: P63/mmc) and the hypothetical InGaO3 (rhombic) are the key structures for constructing the crystal structures of these compounds having the cations with CN=5.",
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author = "Francisco Brown and Ivan Jacobo-Herrera and Victor Alvarez-Monta{\~n}o and Noboru Kimizuka and Keiji Kurashina and Yuichi Michiue and Yoji Matsuo and Shigeo Mori and Naoshi Ikeda and Felipe Medrano",
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TY - JOUR

T1 - Phase relations in the pseudobinary systems RAO3-R2Ti2O7 (R

T2 - rare earth element and Y, A: Fe, Ga, Al, Cr and Mn) and syntheses of new compounds R(A1−xTix)O3+x/2 (2/3≤x≤3/4) at elevated temperatures in air

AU - Brown, Francisco

AU - Jacobo-Herrera, Ivan

AU - Alvarez-Montaño, Victor

AU - Kimizuka, Noboru

AU - Kurashina, Keiji

AU - Michiue, Yuichi

AU - Matsuo, Yoji

AU - Mori, Shigeo

AU - Ikeda, Naoshi

AU - Medrano, Felipe

PY - 2017/7/1

Y1 - 2017/7/1

N2 - Phase relations in the pseudo-binary systems RFeO3-R2Ti2O7 (R: Lu, Ho and Dy), RGaO3-R2Ti2O7 (R: Lu and Er), LuAlO3-Lu2Ti2O7 and RAO3-R2Ti2O7 (R: Lu and Yb. A: Cr and Mn) at elevated temperatures in air were determined by means of a classic quenching method. There exist Lu(Fe1−xTix)O3+x/2, R(Ga1−xTix)O3+x/2 (R: Lu and Er) and Lu(Al1−xTix)O3+x/2 (2/3≤ x≤3/4) having the Yb(Fe1−xTix)O3+x/2-type of crystal structure (x=0.72, space group: R3m, a(Å)=17.9773 and c(Å)=16.978 as a hexagonal setting) in these pseudo binary systems. Eighteen compounds R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) were newly synthesized and their lattice constants as a hexagonal setting were measured by means of the X-ray powder diffraction method. The R occupies the octahedral site and both A and Ti does the trigonalbipyramidal one in these compounds. Relation between lattice constants for the rhombic R(A1−xTix)O3+x/2 and the monoclinic In(A1−xTix)O3+x/2 are as follows, ah≈5 x bm, ch≈3 x cm x sin β and am=31/2 x bm, where ah and ch are the lattice constants as a hexagonal setting for R(A1−xTix)O3+x/2 and am, bm, cm and β are those of the monoclinic In(A1−xTix)O3+x/2. Crystal structural relationships among α-InGaO3 (hexagonal, high pressure form, space group: P63/mmc), InGaO3 (rhombic, hypothetical), (RAO3)n(BO)m and RAO3(ZnO)m (R: Lu-Ho, Y and In, A: Fe, Ga, and Al, B: divalent cation element, m, n: natural number), the orthorhombic-and monoclinic In(A1−xTix)O3+x/2 (A: Fe, Ga, Al, Cr and Mn) and the hexagonal-and rhombic R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) are schematically presented. We concluded that the crystal structures of both the α-InGaO3 (high pressure form, hexagonal, space group: P63/mmc) and the hypothetical InGaO3 (rhombic) are the key structures for constructing the crystal structures of these compounds having the cations with CN=5.

AB - Phase relations in the pseudo-binary systems RFeO3-R2Ti2O7 (R: Lu, Ho and Dy), RGaO3-R2Ti2O7 (R: Lu and Er), LuAlO3-Lu2Ti2O7 and RAO3-R2Ti2O7 (R: Lu and Yb. A: Cr and Mn) at elevated temperatures in air were determined by means of a classic quenching method. There exist Lu(Fe1−xTix)O3+x/2, R(Ga1−xTix)O3+x/2 (R: Lu and Er) and Lu(Al1−xTix)O3+x/2 (2/3≤ x≤3/4) having the Yb(Fe1−xTix)O3+x/2-type of crystal structure (x=0.72, space group: R3m, a(Å)=17.9773 and c(Å)=16.978 as a hexagonal setting) in these pseudo binary systems. Eighteen compounds R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) were newly synthesized and their lattice constants as a hexagonal setting were measured by means of the X-ray powder diffraction method. The R occupies the octahedral site and both A and Ti does the trigonalbipyramidal one in these compounds. Relation between lattice constants for the rhombic R(A1−xTix)O3+x/2 and the monoclinic In(A1−xTix)O3+x/2 are as follows, ah≈5 x bm, ch≈3 x cm x sin β and am=31/2 x bm, where ah and ch are the lattice constants as a hexagonal setting for R(A1−xTix)O3+x/2 and am, bm, cm and β are those of the monoclinic In(A1−xTix)O3+x/2. Crystal structural relationships among α-InGaO3 (hexagonal, high pressure form, space group: P63/mmc), InGaO3 (rhombic, hypothetical), (RAO3)n(BO)m and RAO3(ZnO)m (R: Lu-Ho, Y and In, A: Fe, Ga, and Al, B: divalent cation element, m, n: natural number), the orthorhombic-and monoclinic In(A1−xTix)O3+x/2 (A: Fe, Ga, Al, Cr and Mn) and the hexagonal-and rhombic R(A1−xTix)O3+x/2 (R: Lu-Sm and Y, A: Fe, Ga and Al) are schematically presented. We concluded that the crystal structures of both the α-InGaO3 (high pressure form, hexagonal, space group: P63/mmc) and the hypothetical InGaO3 (rhombic) are the key structures for constructing the crystal structures of these compounds having the cations with CN=5.

KW - Composite crystal structure

KW - In(FeTi)O

KW - InGaO(ZnO) (m: natural number)

KW - R(ATi)O (R: rare earth element and Y, A: Fe, Ga and Al)

KW - The system RAO-RTiO

KW - Yb(FeTi)O

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U2 - 10.1016/j.jssc.2017.04.001

DO - 10.1016/j.jssc.2017.04.001

M3 - Article

AN - SCOPUS:85018467032

VL - 251

SP - 131

EP - 142

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

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