The crystal structure of triuranium pentaselenide

Moseley, P.T.; Brown, D. S.; Whittaker, B.

doi:10.1107/s0567740872005072

Cited by 50 publications

(29 citation statements)

References 2 publications

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“…The systematic extinctions hk0: h = 2n and 00l: l=2n, however, do not fit an orthorhombic space group. The lattice constants of this modification are comparable with those of U3Se 5 (Moseley, Brown & Whittaker, 1972), if the difference between the ionic radii of Se 2-, and C1-and Br-is taken into account. Cation substitutions in the U3Se 5 structure lead to a structure with Pnma symmetry (Jeitschko & Donohue, 1975) and to one with P2~/c symmetry (Potel, Brochu & Padiou, 1975).…”

supporting

confidence: 53%

Ammonium dilead chloride

Ras¹,

IJdo²,

Verschoor³

1977

Acta Crystallogr Sect B

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Abstract.NH4Pb2C15, monoclinic, P2~/c, a = 9-018 (3), b = 7.981 (6), c = 12.502 (4)A, /~ = 90.09(2) ° , Z=4, Dc=4.50 g cm -3. NH4Pb2CI5 adopts the same structure as PbU2Se 5. This structure could be assigned to a number of other halides in the series AB2X 5 with A = K, Rb, TI or NH4; B = Pb or Sr and X = CI or Br.Introduetlon. Jansen (1968) reported the unit-cell dimensions of a series of compounds AB2X 5, with A = K, Rb or NH4; B = Pb or Sr and X = CI or Br. In this series a tetragonal modification with I4/mcm symmetry occurs (Poweli & Tasker, 1937) which is an ordered version of the Cr5B 3 (anti-) type structure (Bertaut & Blum, 1953). The other modification gave powder X-ray diagrams which could be indexed on the basis of an orthorhombic unit cell (Jansen, 1968). The systematic extinctions hk0: h = 2n and 00l: l=2n, however, do not fit an orthorhombic space group. The lattice constants of this modification are comparable with those of U3Se 5 (Moseley, Brown & Whittaker, 1972), if the difference between the ionic radii of Se 2-, and C1-and Br-is taken into account. Cation substitutions in the U3Se 5 structure lead to a structure with Pnma symmetry (Jeitschko & Donohue, 1975) and to one with P2~/c symmetry (Potel, Brochu & Padiou, 1975). In order to distinguish between the two possibilities it is sufficient to look for the occurrence of reflexions Okl: k + l = 2n + 1, which are forbidden in Pnma. In this way P2~/c symmetry could be assigned to this modification. statistics. Nearly half the reflexions had I < 2o(I) and were considered non-significant. Absorption corrections were applied with a computer program written by de Graaff (1973). The transmission factors ranged between 0.37 and 0.46 (p = 380 cm-l). Together with the absorption corrections new standard deviations were computed, taking into account the inaccuracy of the absorption correction and the attenuation factors, leaving 183 5 independent observed reflexions.The intensities were reduced to F values and a Wilson (1942) plot was calculated, yielding approximate values for the scale factor and the initial overall isotropic thermal parameter B.All crystallographic calculations were carried out on the Leiden University IBM 370/158 computer, with a set of computer programs written or modified by Rutten-Keulemans and de Graaff. Atomic scattering * NH 4 has an isotropic temperature factor of 0.7 (2) A 2.

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supporting

confidence: 53%

Ammonium dilead chloride

Ras¹,

IJdo²,

Verschoor³

1977

Acta Crystallogr Sect B

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“…The U--Se distances are comparable to those found in a-USe2 [2. 880-3.133 A (Beck& Dausch, 1989)] and U3Se5 [2.80-3.18 ,~ (Moseley, Brown & Whittaker, 1972)], while the U--O distance agrees with that of 2.363 A in UO2 (Rundle, Baenziger, Wilson & McDonald, 1948). SHELXL92 (Sheldrick, 1992 (Sheldrick, 1990).…”

mentioning

confidence: 53%

Structure of UOSe

Mansuetto¹,

Jobic²,

Ng³

et al. 1993

Acta Crystallogr C

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“…The structure of Y2HfS5 is an ordered version of the structures found for UaSes (Moseley, Brown & Whittaker, 1972) and UaS5 (Potel, Brochu, Padiou & Grandjean, 1972) where the Y and Hf atoms occupy the positions of the three-and four-valent U atoms, respectively. It has been shown earlier, through the formation of solid solutions, that the compounds M[~IU~VS 5 (where M = Gd, Pu, Ce; Marcon & Pascard, 1968), M"U[vS5 (M=Pb, Eu), and M~IU[VSe5 (M= Ca, St, Ba, Eu, Pb;Brochu, Padiou & Prigent, 1972) crystallize with structures similar to UaSs, UaS% and Np3S5 (Marcon, 1967).…”

Section: Structural Relationshipsmentioning

confidence: 87%

Y₂HfS₅ with ordered U₃Se₅-type structure and related compounds

Jeitschko¹,

Donohue²

1975

Acta Crystallogr Sect B

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Y2HfS5 crystallizes with space group Pnma, a= 11"4585 (3), b= 7.7215 (3), c= 7"2207 (2)/~. Its structure was determined from three-dimensional single-crystal X-ray counter data and refined with ellipsoidal thermal parameters to a conventional R of 0.072 for 1082 reflections. It corresponds to that of U3Se5 with Y and Hf substituting for U in an ordered manner. The Y and Hf atoms are coordinated to eight and seven S atoms, respectively. Four independent S atoms are four or five coordinated by the metal atoms. The HfS polyhedra share edges with each other, thus forming a one dimensionally infinite [HfSs] 6-polyanion. The new compounds La2ThS5 and La2ThSe5 also crystallize with this structure, which derives from the RhsGe3 antitype structure by small atomic displacements and a doubling of the b axis.

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The crystal structure of triuranium pentaselenide

Cited by 50 publications

References 2 publications

Ammonium dilead chloride

Ammonium dilead chloride

Structure of UOSe

Y₂HfS₅ with ordered U₃Se₅-type structure and related compounds

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The crystal structure of triuranium pentaselenide

Cited by 50 publications

References 2 publications

Ammonium dilead chloride

Ammonium dilead chloride

Structure of UOSe

Y2HfS5 with ordered U3Se5-type structure and related compounds

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Y₂HfS₅ with ordered U₃Se₅-type structure and related compounds