The crystal structure of NaMnPO4

Moring, J.; Kostiner, E.

doi:10.1016/0022-4596(86)90046-0

Cited by 76 publications

(73 citation statements)

References 2 publications

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“…The présence of a large K cation (rj -1.52 A [13]) seems to be essential for the formation of this type of network because the six membered rings allow the formation of large cavities in which the K ions arc located. In the structures of LiMnP04 [14] and NaMnP04 [15] the Mn cations are found in octahedral environmenls. Tliis leaves less space for the Li and Na ions, but as thèse are relatively small (rj = 0.90 and ri = 1.16, respectively) the structure is still stable.…”

Section: Discussion Und Conclusionmentioning

confidence: 99%

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Luján¹,

Kübel²,

Schmid³

1995

Zeitschrift Für Naturforschung B

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Single crystals of KMnPO4 grown in a KCl flux show ferroelastic domains. The structure was determined on an optically controlled single domain crystal by X-ray diffraction methods. The cell is triclinic with dimensions a = 5.4813(5), b = 8.627(1), c = 8.887(1), in Å, α = 87.73(1)°, β = 89.10(1)°, γ = 88.01(1)°, Vᴍ = 419.6(1) Å3 and Z = 4. The structure is closely related to the stuffed β-tridymite type. DTA experiments between room temperature and 1000 °C and polarized light microscopy observations showed four phase transitions: at 165, 330, 353 and 707 °C.

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Section: Discussion Und Conclusionmentioning

confidence: 99%

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Luján¹,

Kübel²,

Schmid³

1995

Zeitschrift Für Naturforschung B

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“…(~-NaCoPO4 is isostructural with NaMnPO4 (maracite; Moring & Kostiner, 1986) and NaFePO4 (LePage & Donnay, 1977). The final atomic coordinates and isotropic displacement parameters are listed in Table 2, while bond distances, angles and valences are given in Table 3.…”

Section: Description Of the ~-Nacopo4 Structurementioning

confidence: 99%

Structural chemistry of NaCoPO₄

Hammond¹,

Barbier²

1996

Acta Crystallogr Sect B

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Sodium cobalt phosphate, NaCoPO4, occurs as two different polymorphs which transform reversibly at 998 K. The crystal structures of both polymorphs have been determined by single crystal X-ray diffraction. The lowtemperature form c~-NaCoPO4 crystallizes in the space group Pnma with cell parameters: a = 8.871 (3), b = 6.780 (3), c = 5.023 (1) A, and Z = 4 [wR(F 2) = 0.0653 for all 945 independent reflections]. The o~-phase contains octahedrally coordinated Co and Na atoms and tetrahedrally coordinated P atoms, and is isostructural with maracite, NaMnPO4. The structure of high-temperature fl-NaCoPO4 is hexagonal with space group P65 and cell parameters: a = 10.166 (1), c = 23.881 (5)/~, and Z = 24[wR(F 2) -0.0867 for 4343 unique reflections]. The /3-phase belongs to the large family of stuffed tridymites, with the P and Co atoms occupying tetrahedral sites and the Na atoms located in the cavities of the tetrahedral framework. The long c axis corresponds to a 3 x superstructure of the basic tridymite framework (c _~ 8/~) and is caused by the displacement of the Na atoms, tetrahedral tilts and strong distortions of the CoO4 tetrahedra. A bond-valence analysis of these phases reveals that the polymorphism in NaCoPO4 is due in part to over-/underbonding of the Na atom in the low-/high-temperature structures, respectively.

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“…The crystal structure of LiFePO 4 materials has been studied by several authors [29][30][31]. As a member of the olivine family, LFP crystallizes in the orthorhombic system (Pnma space group, No.…”

Section: Olivine Lifepo 4 (Lfp)mentioning

confidence: 99%

Comparative Issues of Cathode Materials for Li-Ion Batteries

et al. 2014

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Abstract:After an introduction to lithium insertion compounds and the principles of Li-ion cells, we present a comparative study of the physical and electrochemical properties of positive electrodes used in lithium-ion batteries (LIBs). Electrode materials include three different classes of lattices according to the dimensionality of the Li + ion motion in them: olivine, layered transition-metal oxides and spinel frameworks. Their advantages and disadvantages are compared with emphasis on synthesis difficulties, electrochemical stability, faradaic performance and security issues.

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The crystal structure of NaMnPO4

Cited by 76 publications

References 2 publications

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Structural chemistry of NaCoPO₄

Comparative Issues of Cathode Materials for Li-Ion Batteries

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The crystal structure of NaMnPO4

Cited by 76 publications

References 2 publications

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO4

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO4

Structural chemistry of NaCoPO4

Comparative Issues of Cathode Materials for Li-Ion Batteries

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Product

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Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of KMnPO₄

Structural chemistry of NaCoPO₄