A Redetermination of the Distribution of Atoms in Cu5Zn8, Cu5Cd8, and Cu9Al4.

Heidenstam, Olov v.; Johansson, Anders; Westman, Sven; Larsen, Charles; Pedersen, C. Th.; Rosén, Ulf

doi:10.3891/acta.chem.scand.22-0653

Cited by 74 publications

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“…RhZn has CsCl type structure, which has also been observed for NiZn [19],~Pd 2 Zn 3 [20],~Pd 2 Cd 3 [21], [17]. This structure has also been found for~Fe 3 Zn 10 [16,29,30], Ni 2 Zn 11 [29],~Pd 2 Zn 11 [31], Cu 5 Cd 8 [15], Ag 5 Zn 8 [32,33], Ag 5 Cd 8 [34], and Au 5 Cd 8 [35]. RhZn 13 has CoZn 13 type structure [12].…”

Section: Discussionmentioning

confidence: 64%

“…The best known examples are b-CuZn (bcc) with an e/a ratio of 3/2 = 21/14, Cu 5 Zn 8 (c-brass) with e/a = 21/13, and e-CuZn 3 (hcp) with e/a = 7/4 = 21/12 [36,37]. Compounds with similar electron counts are isotypic, e. g., Ag 3 Al with e/a = 21/ 14 has a body centered cubic structure, Cu 9 Al 4 with e/a = 21/13 is isotypic with Cu 5 Zn 8 and Ag 5 Cd 8 , and Ag 5 Al 3 with e/a = 21/12 has a hexagonal close packed structure [3,15,38,39]. For this counting rule one electron is counted for Cu, Ag, and Au, two electrons for Zn and Cd, and three for Al, Ga, or In.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Groß

Kotzyba

Künnen

et al. 2001

Z. anorg. allg. Chem.

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The title compounds were prepared by reaction of the elements at elevated temperatures in sealed silica tubes. Single crystals of RhZn and RhZn 13 were obtained by slow cooling of samples with a high zinc content after dissolving the zinc-rich matrix in hydrochloric acid. Their crystal structures were determined from single-crystal X-ray diffractometer data. RhZn has a CsCl type structure: Pm3m, a = 300.9(1) pm. RhZn 13 has a CoZn 13 type structure: C2/m, a = 1090.8(2) pm, b = 753.7(2) pm, c = 512.7(1) pm, b = 101.02(2)°. The structure of Rh 2 Zn 11 is isotypic with Cu 5 Zn 8 , the c-brass structure. It was refined from X-ray diffractometer powder data: I43m, a = 909.1(1) pm. In these structures all atoms have high coordination numbers. The structure of RhZn 13 contains relatively large unoccupied voids. It is suggested that they accommodate nonbonding electrons. Electrical conductivity measurements of Rh 2 Zn 11 and RhZn 13 indicate metallic behavior, however, with an unexpectedly high resistivity for Rh 2 Zn 11 . The expected Pauli paramagnetism of these compounds is overcompensated by the core diamagnetism, suggesting a low density of states at the Fermi level especially for Rh 2 Zn 11 . This correlates with the high electrical resistivity of this compound.Bina È re Verbindungen von Rhodium und Zink: RhZn, Rh 2 Zn 11 und RhZn 13 Inhaltsu È bersicht. Die Titelverbindungen wurden durch Reaktion der Elemente bei hohen Temperaturen in evakuierten Quarzglasampullen hergestellt. Einkristalle von RhZn und RhZn 13 wurden durch langsames Abku È hlen von Proben mit hohem Zinkgehalt nach Auflo È sen der zinkreichen Matrix in Salzsa È ure erhalten. Ihre Kristallstrukturen wurden anhand von Einkristall-Diffraktometerdaten bestimmt. RhZn hat CsCl-Struktur: Pm3m, a = 300.9(1) pm. RhZn 13 kristallisiert in der CoZn 13 -Struktur: C2/m, a = 1090.8(2) pm, b = 753.7(2) pm, c = 512.7(1) pm, b = 101.02(2)°. Die Struktur von Rh 2 Zn 11 ist isotyp mit Cu 5 Zn 8 (c-Messing). Sie wurde anhand von Ro È ntgen-Pulverdiffraktometerdaten verfeinert: I43m, a = 909.1(1) pm. In diesen Strukturen haben alle Atome hohe Koordinationszahlen. In der Struktur von RhZn 13 treten relativ groûe unbesetzte Lu È cken auf. Es wird vermutet, dass sie nichtbindende Elektronen beinhalten. Elektrische Leitfa È higkeitsmessungen von Rh 2 Zn 11 und RhZn 13 zeigen metallisches Verhalten, jedoch mit einem ungewo È hnlich hohen elektrischen Widerstand von Rh 2 Zn 11 . Der zu erwartende Pauli-Paramagnetismus dieser Verbindungen wird durch den Diamagnetismus der Rumpfelektronen u È berkompensiert. Besonders ausgepra È gt ist dies fu È r Rh 2 Zn 11 , was eine geringe Zustandsdichte an der Fermi-Kante erwarten la È ût. Dies korreliert mit dem hohen elektrischen Widerstand dieser Verbindung.

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Section: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Groß

Kotzyba

Künnen

et al. 2001

Z. anorg. allg. Chem.

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“…The densities of Cu 6 Sn 5 , CuZn, and Cu 5 Zn 8 are 8.28 g/cm 3 , 8.36 g/cm 3 , and 8.01 g/cm 3 , respectively. [19][20][21] Using Eq. 1 and the measured thickness and compositions of the intermetallics, the remaining Zn concentrations were calculated and are listed in Table I.…”

Section: Bulk Solder Bath Reactionmentioning

confidence: 99%

Analysis and Experimental Verification of the Volume Effect in the Reaction Between Zn-Doped Solders and Cu

Yang

Wang

Chang

et al. 2008

Journal of Elec Materi

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The volume effect in the reaction between Zn-doped solders and Cu is reported and explained in this article. Zn-doped solders with two different volumes, bulk solder baths (6 g) and small solder balls (10 mg), were reacted with Cu substrates. It was found that the reaction at the interface depended not only on the Zn concentration but also on the volume of the solder. For the bulk solder reaction the Zn concentration stayed nearly constant, whereas in the small solder joint case the Zn concentration changed substantially with the reaction time. This was because the Zn concentration during reaction was different for different solder volumes when the volume effect became important. For bulk solder baths, when the Zn content was 0.5 wt.%, the reaction product was a Cu 6 Sn 5 -based compound. As the Zn content increased to 2 wt.%, the reaction product switched to a Cu 5 Zn 8 -based compound. When the Zn content was 1.0 wt.%, Cu 6 Sn 5 and CuZn formed simultaneously. When the solder volume became smaller, the Zn concentration was no longer constant, and the phase equilibrium at the interface changed with time. It was shown that the shifting of the equilibrium at the interface caused the massive spalling of CuZn.

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“…Cu5 Cd8 D82 γ-brass the interchange of Cu and Cd atoms between the 12(e) and 24(g) positions was found [21]. Thus, it cannot be also excluded that certain part of In probe atoms substitute Ag, however no additional EFG corresponding to such 111 In site was evidenced in the PAC spectra.…”

Section: P Wodniecki' B Wodniecka M Marszałek Az Hrynkiewiczmentioning

confidence: 93%

Perturbed γ-γ Angular Correlation Studies of Isostructural Ag₅Zn₈and Ag₅Cd₈Intermetallic Compounds

et al. 1995

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Perturbed γ-γ angular correlation spectroscopy was applied to study hyperfine interactioii parameters for 111 In probes in intermetallic ckpounds of D82 structure. The perturbed γ-γ angular correlation spectra measured in Ag5Zn8 and Ag5Cd8 phases reflect a number, population and symmetry of nonequivalent substitutional sites occupied by the indium probes. The temperature dependences of the observed electric field gradients were measured in the temperature range 37-500 K PACS numbers: 76.80.+y

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A Redetermination of the Distribution of Atoms in Cu5Zn8, Cu5Cd8, and Cu9Al4.

Cited by 74 publications

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Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Analysis and Experimental Verification of the Volume Effect in the Reaction Between Zn-Doped Solders and Cu

Perturbed γ-γ Angular Correlation Studies of Isostructural Ag₅Zn₈and Ag₅Cd₈Intermetallic Compounds

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A Redetermination of the Distribution of Atoms in Cu5Zn8, Cu5Cd8, and Cu9Al4.

Cited by 74 publications

References 0 publications

Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Binary Compounds of Rhodium and Zinc: RhZn, Rh2Zn11, and RhZn13

Analysis and Experimental Verification of the Volume Effect in the Reaction Between Zn-Doped Solders and Cu

Perturbed γ-γ Angular Correlation Studies of Isostructural Ag5Zn8and Ag5Cd8Intermetallic Compounds

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Perturbed γ-γ Angular Correlation Studies of Isostructural Ag₅Zn₈and Ag₅Cd₈Intermetallic Compounds