Compounds of thorium with transition metals. I. The thorium–manganese system

Florio, John V.; Rundle, R. E.; Snow, A. I.

doi:10.1107/s0365110x52001337

Cited by 201 publications

(68 citation statements)

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“…As can be seen in Table 2, the point positions of Sc~ ~Ir 4 are virtually identical to those given for the Th6Mnz3 type (Florio, Rundle & Snow, 1952) or its ternary version Mg6Cu~6Si 7 (Bergman & Waugh, 1956) except that the 4(a) sites are now occupied. The ternary phase is called the G phase in the Western literature (Spiegel, Bardos & Beck, 1963) but the T phase elsewhere (Markiv & Storozhenko, 1973).…”

Section: Similarity With Th6mn23 and Mg6cu~6si7 Typesupporting

confidence: 57%

Sc11Ir4, Sc11Os4, Sc11Ru4 and Zr11Os4 with a new cubic structure type described by means of a cluster concept

Chabot¹,

Cenzual²,

Parthé³

1980

Acta Crystallogr Sect B

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Section: Similarity With Th6mn23 and Mg6cu~6si7 Typesupporting

confidence: 57%

Sc11Ir4, Sc11Os4, Sc11Ru4 and Zr11Os4 with a new cubic structure type described by means of a cluster concept

Chabot¹,

Cenzual²,

Parthé³

1980

Acta Crystallogr Sect B

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“…The most beryllium-rich structure observed in binary compounds between the Group VIII elements and beryllium is of the type ThMn12 (Florio, Rundle & Snow, 1952), so far reported for Fe, Co, Pd, and Pt with Be * This work was performed under the auspices of the U.S. Atomic Energy Commission. (Batchelder & Raeuchle, 1957, 1958.…”

Section: Introductionmentioning

confidence: 99%

The crystal structure of RhBe6.6

Johnson¹,

Smith²,

Krikorian³

et al. 1970

Acta Crystallogr B Struct Crystallogr Cryst Chem

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109for holding these layers together. Whether a similar rcsult will bc obtained with niobium is yet to be determined.The authors are grateful for financial assistance for this work provided by the National Science Foundation through grants GP-5934 and GP-8481 and to the National Aeronautics and Space Administration for a predoctoral fellowship (to J.S.). Computations were carried out in the Computer Center of the University of Connecticut, which is supported in part by grant G J-9 of the National science Foundation. The crystal structure of a compound in the beryllium-rich portion of the Rh-Be system has been determined. The final structure corresponds to the composition RhBe6.6. The crystals are hexagonal, with probable space group P-6m2. The structure is closely related to the D2a type. The non-integer formula is a result of partial occupancy of two sites. Identical powder patterns are observed in the Fe-Be, the Co-Be and the Ir-Be systems. Cell constants for these compounds are as follows: a c c/a FeBe~ 4

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“…This structure is tetragonal, a = 8.74, c = 4.95 /k, space group I4/mmm, with eight Mn in 8(i), x i = 0.361 and eight Mn in 8(j), xj = 0.277 (Florio, Rundle & Snow, 1952). The structure has been compared with the CaZn 5 structure, but here we describe a relation with the CraSi structure (Fig.…”

Section: Thmn12mentioning

confidence: 99%

The elongated rhombic dodecahedron in alloy structures

Nyman¹,

Andersson²

1979

Acta Cryst Sect A

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CARMELO GIACOVAZZO 305 if Rp and Rq correspond to symmetry operators of order two, E 5 and E 6 are centrosymmetric reflexions. In fact, if R m is a rotation matrix for which Rp R m = Rq (then Rq R,n = Rp also), we have h(Rp-Ro)R m = h(R ° --Ru ) =--h(Rp--Rq), which in terms of phases gives, because of (4) (sp-aq). If E 5 and E 6 are centrosymmetric reflexions, (60) no longer holds; in fact, the modified Bessel function of zero order involving Z 5 and Z 6 has to be replaced by hyperbolic cosines of suitable arguments and a suitable B' value has to replace B. Furthermore, the problem of generalizing (60)to cases in which more (Rp, Rq) pairs exist, which give rise to the crystallographically independent generalized solutions (h~, h2) of system (5), needs to be solved. All these theoretical aspects are discussed elsewhere (Giacovazzo, 1979b) where a general distribution function is given, which in several cases can be considered a useful approximation of the 'true' distribution of O. Concluding remarksA theory has been described which is capable of deriving for any space group the value of a two-phase seminvariant of first rank, • = tp= + ~0v, given all or some of the magnitudes belonging to the first phasing shell of O. The probabilistic formulae are derived both by using the exponential forms of the characteristic functions of the joint probability distributions studied and via their Gram-Charlier expansion. A general algebra for two-phase seminvariants of first rank has been developed which makes their estimation easier in the automatic procedures for phase solution. References DEBAERDEMAEKER, T. & WOOLFSON, M. M. (1972). ActaCryst. A28, 477--481. GIACOVAZZO, C. (1974). Acta Cryst. A30, 481-484. GIACOVAZZO, C. (1977a). Acta Cryst. A33, 531-538. GtACOVAZZO, C. (1977b). Acta Cryst. A33, 539-547. GIACOVAZZO, C. (1977c). Acta Cryst. A30, 933-944. GtACOVAZZO, C. (1978). Acta Cryst. A34, 27-30. GIACOVAZZO, C. (1979a). To be published. GIACOVAZZO, C. (1979b AbstractWith the space-filling elongated dodecahedron or its truncated form as a coordination polyhedron for larger atoms, structures like BaAI4, CeMg2Si2, BaHgl~ and ThMnl2 can be accurately described.

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Compounds of thorium with transition metals. I. The thorium–manganese system

Cited by 201 publications

References 0 publications

Sc11Ir4, Sc11Os4, Sc11Ru4 and Zr11Os4 with a new cubic structure type described by means of a cluster concept

Sc11Ir4, Sc11Os4, Sc11Ru4 and Zr11Os4 with a new cubic structure type described by means of a cluster concept

The crystal structure of RhBe6.6

The elongated rhombic dodecahedron in alloy structures

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