Crystallographic data of new superlattice phases for spinel LiMn2O4 at low temperatures

Hiroshi Hayakawa; Toshimi Takada; Hirotoshi Enoki; Etsuo Akiba

doi:10.1017/S0885715600010770

Crystallographic data of new superlattice phases for spinel LiMn₂O₄ at low temperatures

Hiroshi Hayakawa, Toshimi Takada, Hirotoshi Enoki, Etsuo Akiba

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

9 Citations (Scopus)

Abstract

Extensive analyses of low-temperature powder x-ray diffraction data for spinel LiMn₂O₄ (Fd3m at room temperature) make it clear that two structural phase transitions occur: first around 285 K from cubic to orthorhombic, second around 65 K from orthorhombic to tetragonal. At temperatures under 285 K, superlattice peaks appear in the diffraction pattern that were successfully indexed by tripling the a and b axes of the spinel unit cell. At 250 K, the unit cell is face-centered orthorhombic, Fddd, F2dd, or Fd2d, with a = 24.855(1), b = 24.755(2), c = 8.2014(3) Å, V = 5046.1(4) Å³, D_x = 4.284 g/cm³, Z = 72. The unit cell at 30 K was confirmed to be body-centered tetragonal I4 ₁ / amd or I4 ₁ /a, with a = 17.5176(3), c = 8.1961(2) Å, V = 2515.1(1) Å³, D_x = 4.298 g/cm³, Z = 36.

Original language	English
Pages (from-to)	19-22
Number of pages	4
Journal	Powder Diffraction
Volume	15
Issue number	1
DOIs	https://doi.org/10.1017/S0885715600010770
Publication status	Published - Mar 2000
Externally published	Yes

All Science Journal Classification (ASJC) codes

Radiation
Materials Science(all)
Instrumentation
Condensed Matter Physics

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10.1017/S0885715600010770

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title = "Crystallographic data of new superlattice phases for spinel LiMn2O4 at low temperatures",

abstract = "Extensive analyses of low-temperature powder x-ray diffraction data for spinel LiMn2O4 (Fd3m at room temperature) make it clear that two structural phase transitions occur: first around 285 K from cubic to orthorhombic, second around 65 K from orthorhombic to tetragonal. At temperatures under 285 K, superlattice peaks appear in the diffraction pattern that were successfully indexed by tripling the a and b axes of the spinel unit cell. At 250 K, the unit cell is face-centered orthorhombic, Fddd, F2dd, or Fd2d, with a = 24.855(1), b = 24.755(2), c = 8.2014(3) {\AA}, V = 5046.1(4) {\AA}3, Dx = 4.284 g/cm3, Z = 72. The unit cell at 30 K was confirmed to be body-centered tetragonal I4 1 / amd or I4 1 /a, with a = 17.5176(3), c = 8.1961(2) {\AA}, V = 2515.1(1) {\AA}3, Dx = 4.298 g/cm3, Z = 36.",

author = "Hiroshi Hayakawa and Toshimi Takada and Hirotoshi Enoki and Etsuo Akiba",

year = "2000",

month = mar,

doi = "10.1017/S0885715600010770",

language = "English",

volume = "15",

pages = "19--22",

journal = "Powder Diffraction",

issn = "0885-7156",

publisher = "International Centre For Diffraction Data",

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T1 - Crystallographic data of new superlattice phases for spinel LiMn2O4 at low temperatures

AU - Hayakawa, Hiroshi

AU - Takada, Toshimi

AU - Enoki, Hirotoshi

AU - Akiba, Etsuo

PY - 2000/3

Y1 - 2000/3

N2 - Extensive analyses of low-temperature powder x-ray diffraction data for spinel LiMn2O4 (Fd3m at room temperature) make it clear that two structural phase transitions occur: first around 285 K from cubic to orthorhombic, second around 65 K from orthorhombic to tetragonal. At temperatures under 285 K, superlattice peaks appear in the diffraction pattern that were successfully indexed by tripling the a and b axes of the spinel unit cell. At 250 K, the unit cell is face-centered orthorhombic, Fddd, F2dd, or Fd2d, with a = 24.855(1), b = 24.755(2), c = 8.2014(3) Å, V = 5046.1(4) Å3, Dx = 4.284 g/cm3, Z = 72. The unit cell at 30 K was confirmed to be body-centered tetragonal I4 1 / amd or I4 1 /a, with a = 17.5176(3), c = 8.1961(2) Å, V = 2515.1(1) Å3, Dx = 4.298 g/cm3, Z = 36.

AB - Extensive analyses of low-temperature powder x-ray diffraction data for spinel LiMn2O4 (Fd3m at room temperature) make it clear that two structural phase transitions occur: first around 285 K from cubic to orthorhombic, second around 65 K from orthorhombic to tetragonal. At temperatures under 285 K, superlattice peaks appear in the diffraction pattern that were successfully indexed by tripling the a and b axes of the spinel unit cell. At 250 K, the unit cell is face-centered orthorhombic, Fddd, F2dd, or Fd2d, with a = 24.855(1), b = 24.755(2), c = 8.2014(3) Å, V = 5046.1(4) Å3, Dx = 4.284 g/cm3, Z = 72. The unit cell at 30 K was confirmed to be body-centered tetragonal I4 1 / amd or I4 1 /a, with a = 17.5176(3), c = 8.1961(2) Å, V = 2515.1(1) Å3, Dx = 4.298 g/cm3, Z = 36.

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Crystallographic data of new superlattice phases for spinel LiMn₂O₄ at low temperatures

Abstract

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