Interaction of the Components in the Ni—Zn—Sb Ternary System at 570 K.

Abstract

Interaction of the Components in the Ni-Zn-Sb Ternary System at 570 K. -Three new compounds are identified in the 570 K isothermal section of the phase diagram of the title system. Ni3ZnSb2 crystallizes in a new structure type (space group P3m1), Ni40Zn53Sb7 has the CsCl type structure (space group Pm3m), and NiZnSb crystallizes in the MgAgAs type structure (space group F43m). -(CHUMAK*, I.; PAVLYUK, V.; J. Alloys Compd. 367 (2004) 1-2, 85-88; Dep. Inorg. Chem., Ivan Franko Natl. Univ. L'viv, L'viv 79005, Ukraine; Eng.) -Schramke 25-025

Phase equilibria of the Ni–Si–Zn system at 600 °C

“…Comprehensive comparison among the isothermal sections established by Stadelmaier et al [13] at 800 C, by Chumak et al [15] at 297 C and by the present authors at 600 C reveals that the phase relationships at these three different temperatures are significantly different from each other. Besides, there exist discrepancies on some issues such as the solubility of the third elements in the binary compounds, and the extension direction of certain NieSi binary compounds from the boundary binary system into the ternary system.…”

“…3h. The TiAl 3 -type Ni 3 Si 0.33 Zn 0.67 , which was reported by Chumak et al [15] and is labeled as T 2 in the present work, was indexed from the XRD pattern of alloy 15 as shown in Fig. 2h.…”

“…The two ternary compounds Ni 2 SiZn 3 (s 3 ), and Ni 3 Si 2 Zn (s 4 ), which were reported by Stadelmaier et al [13], were confirmed to exist at 600 C. The b 0 phase was assumed to be the Sistabilized b-NiZn phase in the NieZn binary system. The T 2 phase is the TiAl 3 -type Ni 3 Si 0.33 Zn 0.67 reported by Chumak et al [15]. The T 1 phase is a newly found ternary phase.…”

“…The existence of the three ternary compounds reported by Stadelmaier et al [13] was confirmed at 297 C. A new ternary compound of Ni 3 Si 0.33 Zn 0.67 with TiAl 3 -type structure in space group of I4/mmm was found at this temperature. According to Chumak et al [15], NiSi and Ni 3 Si dissolved considerable content of Zn at 297 C (<10 at.% Zn), which is not in agreement with the report by Stadelmaier et al [13] that the solubility of Zn in all the NieSi binary phases was negligibly little at 800 C. In addition, it should be noted that the phase equilibrium relationships at 297 C are significantly different from the ones at 800 C reported by Stadelmaier et al [13].…”

“…Three ternary compounds Ni 2 ZnSi (cubic BiF 2 -type structure), Ni 2 SiZn 3 (cubic Ti 2 Ni-type structure) and Ni 3 Si 2 Zn (cubic FeSi-type structure), which were labeled as s 1 /s 2 , s 3 and s 4 , respectively, were found at 800 C [13,14]. Later on, an isothermal section at 297 C of the NieSieZn system was determined by Chumak et al [15] using X-ray analysis of 56 alloys. The existence of the three ternary compounds reported by Stadelmaier et al [13] was confirmed at 297 C. A new ternary compound of Ni 3 Si 0.33 Zn 0.67 with TiAl 3 -type structure in space group of I4/mmm was found at this temperature.…”