Analysis of Multicomponent Systems for the Contents of Iridium and Palladium
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ANALYSIS OF MULTICOMPONENT SYSTEMS FOR THE CONTENTS OF IRIDIUM AND PALLADIUM L. V. Lozyns’ka,1,2 O. S. Tymoshuk,1 and T. Ya. Vrublevs’ka1 The interactions of Ir(IV) with 5-hydroxyimino-4-imino-1,3-thiazolidin-2-one and Pd(II) with 4-[ N ′ -(4imino-2-oxo-thiazolidin-5-ylidene)-hydrazino]-benzenesulfonic acid are studied for the first time. The optimal conditions for the formation of these compounds and their metrological characteristics are established. On the basis of the obtained results, some new methods for the evaluation of the contents of iridium and palladium are developed and approved by analyzing the intermetallic compounds ( Tb 2 Ir3Al 9 , Gd 2 Ir3Al 9 , Yb 40 Pd 40Ga 20 , and Yb 40 Pd 38Sn 22 ) and a SP5-35B resistor ( Sr ≤ 0.02). Keywords: palladium (ІІ), iridium (IV), azolidones, spectrophotometry, intermetallic compounds, resistor.
Platinum metals are characterized by their high heat resistance, plasticity, corrosion resistance, reflection and emission abilities, thermal and electrical conductivities, and high magnetic characteristics [1, 2]. These unique physical and chemical properties are typical not only of metals themselves but also of their compounds, and materials based on these metals: alloys, catalysts, powders, oxide films, etc. They play an important role in various branches, such as electronics, electro- and radioengineering, machine-building, chemistry (catalysis), biology, and medicine [1–3]. In connection with the development of new materials, the interest in the investigation of alloys and intermetallic compounds permanently increases. The introduction of iridium, palladium, or other platinum metals enables us not only to increase the mechanical strength of alloys (Ir–Hf–Nb) but also to enhance their chemical stability (Pd–Cu–Ga) [4, 5]. The alloys based on palladium and iridium are good catalysts (PdGa, Ni–Ir) and adsorbents of hydrogen atoms (Pd–Ag) [6–8]. The intermetallic compounds of iridium ( Ti 3Ir , ThIr2 , ZrIr2 , Nb 3Ir , Th 7 Ir3 , Rh17– x Irx S15 , etc.) and palladium ( YbPd 2Sn , etc.) are known as superconducting materials [9–11]. Hence, it is important to study the behavior and contents of these components in analyzing the indicated intermetallic compounds. Materials, Equipment, and Experimental Procedure In order to prepare the initial solution with Pd(II), we dissolve metallic palladium (99.999%) in a mixture of reagent-grade concentrated acids HNO 3 and HCl (1:3). The working solutions of palladium (ІІ) were prepared
by the dissolution of the initial solution with 1.0 М HCl. To produce the initial standard solution of Ir(IV)
([IrCl 6 ]2– ) , we sintered exact portions of metallic iridium (99.99%) 0.01–0.05 g in weight with an oxidizing mixture (0.2 g NaNO 3 , 0.6 g NaOH, and 0.1 g BaO 2 ; analytically pure) with subsequent dissolution of the ob1 2
Franko Lviv National University, Lviv, Ukraine.
Corresponding author; e-mail: [email protected].
Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 50, No. 6, pp. 89–94, November–December, 2014. Original article
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