TiMnSi2 and TiFeSi2 with new orthorhombic-type structure

Steinmetz, J.; Venturini, G.; Roques, Bernárd P.; Engel, N.; Chabot, B.; Parthé, E.

doi:10.1107/s0567740882008140

Cited by 31 publications

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“…The synthesis of the compounds MnTiSi 2 and TiFeSi 2 was first reported by Markiv (1966), and the crystal structure of synthetic TiFeSi 2 was described by Steinmetz et al (1982). Essene & Fisher (1986) reported the presence of TiFeSi 2 crystals intergrown with intermetallic Fe-Si compounds in metallic nuggets in a glassy fulgurite, and a similar occurrence was reported by Wasserman et al (2002).…”

Section: Introductionmentioning

confidence: 58%

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

Li¹,

Fang²,

Nicheng³

et al. 2009

The Canadian Mineralogist

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We describe the new mineral species zangboite, ideally TiFeSi 2 , found in the podiform chromitites of the Luobusha ophiolite in Tibet, People's Republic of China. The tabular to irregular crystals range from 0.002 to 0.15 mm in diameter and form an intergrowth with native silicon and a Fe-Si phase. Zangboite is steel grey in color. The luster is metallic, it is opaque, and the streak is black. The mineral is brittle; it has a conchoidal fracture and seems devoid of cleavage. The estimated Mohs hardness is 5½, and the calculated density is 5.09 g/cm (004)(57), and 3.8358(002)(50). The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification (IMA 2007-036).

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Section: Introductionmentioning

confidence: 58%

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

Li¹,

Fang²,

Nicheng³

et al. 2009

The Canadian Mineralogist

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“…Unfortunately, a compound with the molecular formula Ti3Mn4Si6 does not exist, although Ti, which belongs to the same group in the periodic table as Hf, is much cheaper and more abundant in nature than Hf. In the ternary system of Ti-Mn-Si, the existence of a compound, TiMnSi2 12) , having a composition similar to that of Ti3Mn4Si6 was reported.…”

Section: Z = S 2 /( )mentioning

confidence: 99%

“…It is known that titanium (Ti) and zirconium (Zr) have lower thermal conductivity. Investigations of ternary intermetallic compounds containing Ti or Zr as the main component have revealed that a series of intermetallic compounds have interesting crystal structures that large vacant spaces are contained within their unit cells 11,12) . It was postulated that these compounds would have low thermal conductivity because the open spaces in their structures can lead to phonon scattering and energy loss.…”

Section: Z = S 2 /( )mentioning

confidence: 99%

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Thermoelectric Properties of Zr3Mn4Si6 and TiMnSi2

Suzuki

Kozasa

2009

Journal of Elec Materi

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The Seebeck coefficient, electrical resistivity, and thermal conductivity of Zr3Mn4Si6 and TiMnSi2 were studied. The crystal lattices of these compoundscontain relatively large open spaces, and therefore, they have fairly low thermal conductivities (8.26 and 6.63 Wm -1 K -1 , respectively) at room temperature. Their dimensionless figures of merit ZT were found to be 1.92 × 10 -3 (at 1200 K) and 2.76 × 10 -3 (at 900 K), respectively. The good electrical conductivities and low Seebeck coefficients may possibly be due to the fact that the distance between silicon atoms in these compounds is shorter than that in pure semiconductive silicon.

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“…For details see Fig. 1 in Steinmetz et al (1982).Another related structure type is HfFe6Ge6 (hP13, P6/mmm) (Olenitch, Akselrud & Yarmolyuk, 1981), reported also with LuFe6Ge6 (Chabot & Parth6, 1983). In this structure one finds infinite columns of Fe-centered face-shared Ge octahedra but no Mcentered antiprism columns.…”

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confidence: 99%

A classification scheme for ternary structures with infinite antiprism and octahedron columns used to predict the structure of Sc₃Re₂Si₄

Chabot¹,

Parthé²

1985

Acta Crystallogr Sect B

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A classification of temary transition-metal silicides (and germanides) containing infinite parallel columns of Si(Ge)-centered square antiprisms and infinite parallel columns of transition-metal-centered octahedra is given which is based on the composition of the antiprisms and on the linkage of the octahedra. This scheme allows one to classify the following structure types: Zr4foaGe7, Nb4Cr2Sis, Nb2CraSis, Hf2Ru3Si4, and also ZrFeSi2, ZrMnSi2 and LuMnGe2. The previously reported Sc3Re2Si3 structure has structural features which could be classified in the scheme if extra Si atoms are present. It is shown that Sc3Re2Si3 is in fact in error, the true composition being Sc3Re2Si4 and its structure represents the eighth structure type of this structure family. Sc3Re2Si4: Mr=619"61, IntroductionIn two recent systematic studies of the structures of ternary rare-earth -transition-metal silicides and homologues (Gladyshevskii & Bodak, 1982; Parth6 & Chabot, 1984) it has been possible to correlate a great number of different structure types from geometric considerations. One of the aims of such an undertaking is to understand and interpret the 0108-7681/85/040213-07501.50 sometimes complicated chemical formulas in relation to the structural features. In the case of ternary structures with centered trigonal prisms it was, for example, possible to formulate the so-called waistcontact-restriction rule. This rule permits the calculation of the correct composition for complete atom ordering at the prism centers for structures which were previously reported as partially ordered (Parth6, Chabot & Hovestreydt, 1983; Parth6 & Hovestreydt, 1985).In this paper we draw attention to particular ternary structures of general composition RxTrMz where R = very late rare-earth element, Sc or a transition element of the fourth group (also sometimes Nb or Ta); T = smaller transition element of Cr, Mn, Fe or Co group (also V); and M = Si or Ge. The structures of interest here are characterized by two kinds of infinite columns, both of which are parallel to the shortest cell axis (of about 5 to 6/~). One is formed of faceshared square antiprisms of R atoms or a mixture of R and T atoms, each antiprism being centered by an M atom. The second kind of infinite column consists of face-shared octahedra of M atoms, each octahedron being centered by a T atom. The centered antiprisms and centered octahedra may occasionally be deformed, but any distance between the central atom and an atom forming the polyhedron is always equal to or smaller than the sum of the metallic radii (Teatum, Gschneidner & Waber, 1960 Table 1. Drawings of the structure types, in a projection along the column axes, can be found in Fig. 1. The structures can be conveniently classified according to:-the nature of the atoms forming the square antiprism columns and -the linkage of the octahedron columns. Nature of the atoms forming the antiprism columnsExperimentally, it is found that the M-centered antiprisms can be formed either of R atoms only (RsM), of R and T atom...

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TiMnSi2 and TiFeSi2 with new orthorhombic-type structure

Cited by 31 publications

References 0 publications

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

Thermoelectric Properties of Zr3Mn4Si6 and TiMnSi2

A classification scheme for ternary structures with infinite antiprism and octahedron columns used to predict the structure of Sc₃Re₂Si₄

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TiMnSi2 and TiFeSi2 with new orthorhombic-type structure

Cited by 31 publications

References 0 publications

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

ZANGBOITE, TiFeSi2, A NEW MINERAL SPECIES FROM LUOBUSHA, TIBET, CHINA, AND ITS CRYSTAL STRUCTURE

Thermoelectric Properties of Zr3Mn4Si6 and TiMnSi2

A classification scheme for ternary structures with infinite antiprism and octahedron columns used to predict the structure of Sc3Re2Si4

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A classification scheme for ternary structures with infinite antiprism and octahedron columns used to predict the structure of Sc₃Re₂Si₄