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- W2949144947 abstract "The binary systems Ca-Sn, Ba-Sn, Eu-Sn, Yb-Sn, Sr-Pb, Ba-Pb, and Eu-Pb do not contain Cr(5)B(3)-like A(5)Tt(3) phases when care is taken to exclude hydrogen from the reactions (Tt = tetrel, Si-Pb). All form ternary A(5)Tt(3)H(x)() phases (x < or = 1) with stuffed Cr(5)B(3)-like structures instead, and all of those tested, Ca-Sn, Ba-Sn, Sr-Pb, and Ba-Pb, also yield the isostructural A(5)Tt(3)F. The structures and compositions of Ca(5)Sn(3)H(x), Ca(5)Sn(3)F(0.89), Eu(5)Sn(3)H(x), and Sr(5)Pb(3)F have been refined from single-crystal X-ray diffraction data and of Ca(5)Sn(3)D from powder neutron data. The interstitial H, F atoms are bound in a tetrahedral (A(2+))(4) cavity in a Cr(5)B(3)-type metal atom structure. Nine previous reports of binary Ba(5)Sn(3), Yb(5)Sn(3), Sr(5)Pb(3), and Ba(5)Pb(3) compounds were wrong and presumably concerned the hydrides. The new ternary phases are generally Pauli-paramagnetic, evidently with pi electrons from the characteristic tetrelide dimers in this structure type at least partially delocalized into the conduction band. The Sn-Sn bonds appear correspondingly shortened on oxidation. Other new phases reported are CaSn (CrB type), Yb(5)Sn(4)H(x) (Sm(5)Ge(4)), YbSn ( approximately TlTe), Ba(5)Pb(3) ( approximately W(5)Si(3)), and Yb(31)Pb(20) (Ca(31)Sn(20))." @default.
- W2949144947 created "2019-06-27" @default.
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- W2949144947 date "2001-02-06" @default.
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- W2949144947 title "Hydrogen Impurity Effects. A<sub>5</sub>Tt<sub>3</sub>Z Intermetallic Compounds between A = Ca, Sr, Ba, Eu, Yb and Tt = Sn, Pb with Cr<sub>5</sub>B<sub>3</sub>-like Structures That Are Stabilized by Hydride or Fluoride (Z)" @default.
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- W2949144947 doi "https://doi.org/10.1021/ic0010306" @default.
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