白金-ニオブ系状態図の研究

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タイトル別名
  • The Platinum-Niobium System
  • ハッキン-ニオブケイ ジョウタイズ ノ ケンキュウ

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The binary system platinum-niobium has been investigated by X-ray analysis, microscopic examination and liquidus temperature determination. The platinum phase (α) dissolves up to 36 at%Nb and the lattice parameter of platinum increases from 3.916 kX to 3.956 kX with alloying of niobium. The melting point of α-phase alloy rises with increasing of niobium content and 36 at%Nb alloy shows the maximum rise 2000°C. There are two intermetallic compounds, PtNb2 and PtNb3, in this system. PtNb2 is formed by a peritectic reaction of liquid+PtNb3\ ightleftharpoonsPtNb2 at about 1900°C. PtNb2 has a tetragonal lattice, and forms an eutectic with α-phase of 36 at%Nb at 1700°C. The eutectic composition is 45 at%Nb. Thers is a peritectic reaction between Nb and PtNb3 as follows: liquid+Nb\ ightleftharpoonsPtNb3 at about 2000°C. PtNb3 has a β-wolfram type cubic structure and its lattice parameter increases from 5.137 to 5.156 kX with increasing of niobium. The solubility limit of platinum in niobium is less than 1 at%. 25 at%Nb alloy (correspond to Pt3Nb) has a random array of platinum and niobium atoms on face-centered cubic lattice at high temperature and shows a disordered structure. The formation of a superlattice takes place below a critical temperature, and its temperature is close to the solidus and is estimated as about 1800°C.

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