Metal hydrides

Japanese: 金属状水素化物 - きんぞくじょうすいそかぶつ

...It is a strong reducing agent. (3) Metallic hydrides These are hydrides of transition elements, in which hydrogen atoms, either of a fixed composition (CrH, FeH ₆ , etc.) or of variable composition (LaH _2.76 , TaH _0.76 , etc.), enter the gaps between metal atoms and deform their structure. They are solids with high melting points and retain some of the properties of the original metal, but have a smaller specific gravity. ...

From [Hydride]

...Because of this, the melting and boiling points are low, and most compounds are in the form of molecular gases at room temperature, hence the name (H ₂ O is an exception, being liquid). (3) Metal-like hydrides Also called interstitial hydrides, these are compounds in which hydrogen atoms enter the gaps in the metal lattice and form a solid solution with the metal. They are often found in compounds with elements in the central part of the periodic table. ...

From [Hydrogen storage metals]

...The dissociation temperature is generally lower than that of group (1). (3) Metallic hydrides in which hydrogen is dissolved in solid metal crystals to form a solid solution Many common metals such as Al, Fe, Ni, and Cu dissolve hydrogen through an endothermic reaction. Because this is an endothermic reaction, unlike in the case of compounds, the amount of dissolved hydrogen increases with increasing temperature under a constant hydrogen pressure. ...

*Some of the terminology that refers to "metal hydrides" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…強い還元剤になる。(3)金属状水素化物　遷移元素の水素化物がこれで，水素の原子があるいは一定の組成をなし(CrH,FeH₆など)，あるいは不定の組成で(LaH_2.76,TaH_0.76など)金属原子のすきまに入りこみ，その構造を変形させているものである。固体で，融点が高く，もとの金属の性質をある程度残しているが，比重はそれより小さい。…

【水素化物】より

…そのため融点，沸点が低く，常温ではほとんどの化合物が分子状の気体となっているためにこの名称がある(H₂Oは例外的に液体)。(3)金属状水素化物metal‐like hydride　侵入型水素化物interstitial hydrideとも呼ばれ，金属の格子のすき間に水素原子が侵入し，金属と固溶体を形成している化合物。周期表中中央の部分に属する元素との化合物に多くみられる。…