It often refers to metallic materials with high melting points, particularly tungsten, tantalum, molybdenum, and niobium, and their alloys. If we arrange the elements in order of melting point, we get tungsten (3387°C), rhenium (3180°C), tantalum (2996°C), osmium (2700°C), molybdenum (2610°C), niobium (2468°C), iridium (2447°C), boron (2300°C), ruthenium (2250°C), and hafnium (2150°C). Here, boron is not a metal, but the rest are, and the fact that there are metallic elements with such high melting points is one of the characteristics of metallic elements. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
融点の高い金属材料,とくにタングステン,タンタル,モリブデン,ニオブと,これらの合金をさすことが多い。元素を融点の順に並べてみると,タングステン(3387℃),レニウム(3180℃),タンタル(2996℃),オスミウム(2700℃),モリブデン(2610℃),ニオブ(2468℃),イリジウム(2447℃),ホウ素(2300℃),ルテニウム(2250℃),ハフニウム(2150℃)となる。ここでホウ素は金属ではないが,あとは金属で,このように高融点のものがあるというのは金属元素の一つの特徴である。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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