The Crystal Structure of NaPt3O4

Waser, Jürg; McClanahan, E.D.

doi:10.1063/1.1748239

Cited by 74 publications

(40 citation statements)

References 8 publications

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“…The initial value of the unit-cell parameter was taken from Waser & McClanahan (1951). The only structural parameters varied during the refinements were the temperature factors and site occupancies.…”

Section: Methodsmentioning

confidence: 99%

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Neutron powder diffraction study of two sodium platinum oxides: Na1.0Pt3O4 and Na0.73Pt3O4

Schwartz¹,

Prewitt²,

Shannon³

et al. 1982

Acta Crystallogr Sect B

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Neutron powder diffraction profile analysis has been used to confirm the structures of Na~.0Pt30 4 and Na0.7aPt30 4. Both compositions are cubic in space group Pm3n with Z = 2. The structure of Na~.0Pt30 4, with a = 5.6868 (2) A as determined by X-ray powder diffraction, was refined to a final discrepancy factor for the weighted profile of R wp = 0. 120 for 30 peaks representing 39 reflections. The structure of Na0.73Pt30 4, a poorly crystallized compound with a = 5.675 (1)A, was refined to R wp = 0.212 for 31 peaks representing 40 reflections. Reliable thermal parameters were determined for lighter atoms in this platinum-dominated structure. The refined values of the sodium occupancy factor in both cases confirm the chemical analysis. Sodium occupancy values are also consistent with the linear relationship of unit-cell measurements vs sodium content for these compounds. The short Pt-Pt distance of 2.843 A in the structure of Na~.0Pt30 4 is consistent with its electrical properties. The metallic resistivity ofNa~.0Pt30 4 (p = 9 x 10 -7 ~m at 293 K) and the presence of a single Pt site with formal valence -~ places

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Section: Methodsmentioning

confidence: 99%

“…1972), was first determined by Waser & McClanahan (1951) with X-ray powder diffraction techniques. It was not necessary to refine atom positional parameters, as Na.…”

Section: Introductionmentioning

confidence: 99%

Neutron powder diffraction study of two sodium platinum oxides: Na1.0Pt3O4 and Na0.73Pt3O4

Schwartz¹,

Prewitt²,

Shannon³

et al. 1982

Acta Crystallogr Sect B

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“…They are also of interest as one of the few examples of oxide families containing divalent Pt. Other compounds containing Pt 2+ are PtO (Westwood & Bennewitz, 1974), Na2PtO 2 (Urland & Hoppe, 1972), Bil.6Pbo.4PtO 4 (Boivin, Conflant & Thomas, 1976), K3Pt20 4 (Zentgraf, Claes & Hoppe, 1980), and compounds of the type M x Pt304 of which Na~Pt304 (Waser & McClanahan, 1951;Scheer, van Arkel & Heydig, 1955;Cahen, Ibers & Wagner, 1974;Schwartz, Prewitt, Shannon, Corliss, Hastings & Chamberland, 1982) is the most well known example. Muller & Roy (1969) prepared polycrystalline CuPt306 using CuO and Pt black at 1163 K and 20 M Pa of 02.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and structure of orthorhombic cadmium platinum oxide, CdPt3O6

Prewitt¹,

Schwartz²,

Shannon³

1983

Acta Crystallogr C

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Abstract. Mr=793.7 , orthorhombic, Cmmm, a= 7.2144(6), b=10.190(1), c=3.1650(2)A, V= 232.67 (6) A 3, Z = 2, D x = 11.33 gcm -3, 2(Ag Ka) = 0.5609 A, # = 513.5 cm -1, T= 293 K, F(000) = 660, R = 0.047 for 417 unrejected reflections in the range 0.0849 < sin 0/2 < 0-8914 A -1. Crystals of CdPt306 were grown by a hydrothermal technique. Bulk electrical-resistivity measurements on a pellet of compressed powder yielded values of p(298 K)= 0.03 f~m and E a = 0.04 e V (1 e V = 1.60 x 10-19j) in the range 5 to 298 K. This low resistivity is related to metal-metal distances of 3.165 A in a structure which includes chains of edge-shared PtO6 octahedra and columnar stacks of planar PtO 4 groups extending along [0011.

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“…All MxPtaO4 compositions have been reported to have the NaPt30 4 structure (Waser & McClanahan, 1951), which consists of infinite stacks of parallel square-planar PtO 4 groups extending along all three crystallographic axes. The counterion resides in an eight-coordinated cubic polyhedron that separates the PtO 4 groups in each direction (Fig.…”

Section: Introductionmentioning

confidence: 99%

Analysis of structural distortions in non-stoichiometric ternary platinum oxides: Li0.64Pt3O4 and Co0.37Na0.14Pt3O4

Schwartz¹,

Parise²,

Prewitt³

et al. 1982

Acta Crystallogr Sect B

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The structures of Li0.64Pt30 4 and Co0.37Na0.14Pt30 4 have been determined from neutron powder diffraction experiments and found to exhibit two kinds of internal structural distortions distinguishing them from the prototype NaPt304 structure in which the Na counterion occupies eight-coordinated cubic sites in the PtO 4 framework. Both the Li0.64Pt30 4 and Co0.37Na0.14Pt30 4 structures were characterized by modifications to the geometry of the eight-coordinated counterion site. In Li0.64Pt30 4 the Li ions were randomly distributed on these sites, and the oxygen coordination was no longer cubic, with four short Li-O distances of 2.22/k and four long ones of 2.65 A in the configuration of two interpenetrating tetrahedra. In Co0.37Na0.14Pt304 there was ordering of Co, Na, and vacancies in the eight-coordinated sites, which imposed a structural limit on substitution of eight-coordinated atoms to 0.5 per formula unit. In this case, cationoxygen coordination was cubic, with eight O atoms at a distance of 2.36 (1)A from the occupied counterion site. The Li0.64Pt30 4 structure, with a = 5.6242 (2)A and Z = 2, was refined in space group P43n by the Rietveld profile technique with a final weighted profile discrepancy factor Rwe = 0.160 for 35 reflections collected at 2 = 1.343/1,. The Co0.37Na0.14Pt30 4 structure, with a = 5.6321 (4)/i, and Z = 2, was refined in space group Pm3 using integrated intensities with a final weighted R w = 0.036 for 15 observations representing 22 reflections collected at 2 = 2.460/~.

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The Crystal Structure of NaPt3O4

Cited by 74 publications

References 8 publications

Neutron powder diffraction study of two sodium platinum oxides: Na1.0Pt3O4 and Na0.73Pt3O4

Neutron powder diffraction study of two sodium platinum oxides: Na1.0Pt3O4 and Na0.73Pt3O4

Synthesis and structure of orthorhombic cadmium platinum oxide, CdPt3O6

Analysis of structural distortions in non-stoichiometric ternary platinum oxides: Li0.64Pt3O4 and Co0.37Na0.14Pt3O4

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