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Iron–hydrogen alloy, also known as iron hydride, is an alloy of iron and hydrogen and other elements. Because of its lability when removed from a hydrogen atmosphere, it has no uses as a structural material. At ordinary pressure, iron can incorporate a small amount of hydrogen into its crystal structure, and at extreme temperatures and pressures, such as might be found in the Earth's core, larger amounts of hydrogen can be incorporated. These substances are the subject of study in industrial metallurgy and planetary geology.

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  • Iron–hydrogen alloy, also known as iron hydride, is an alloy of iron and hydrogen and other elements. Because of its lability when removed from a hydrogen atmosphere, it has no uses as a structural material. Iron is able to take on two crystalline forms (allotropic forms), body centered cubic (BCC) and face centered cubic (FCC), depending on its temperature. In the body-centred cubic arrangement, there is an iron atom in the centre of each cube, and in the face-centred cubic, there is one at the center of each of the six faces of the cube. It is the interaction of the allotropes of iron with the alloying elements that gives iron-hydrogen alloy its range of unique properties. In pure iron, the crystal structure has relatively little resistance to the iron atoms slipping past one another, and so pure iron is quite ductile, or soft and easily formed. In iron hydride, small amounts of hydrogen within the iron act as a softening agent that promote the movement of dislocations that are common in the crystal lattices of iron atoms. Other elements and inclusions act as hardening agents that prevent the movement of dislocations. The hydrogen in typical iron hydrides may contribute up to 13 ppm in its weight. Varying the amount of hydrogen, as well as controlling its chemical and physical makeup in the final iron hydride (either as a solute element, or as a precipitated phase), hastens the movement of those dislocations that make pure iron ductile, and thus controls and undermines its qualities. Varying the other alloying elements and controlling their chemical and physical makeup also controls, but enhances its qualities. These qualities include such things as the hardness, quenching behaviour, need for annealing, tempering behaviour, yield strength, and tensile strength of the resulting iron-hydrogen alloy. The retention of iron hydride's strength compared to pure iron is possible only by maintaining iron's ductility. At ordinary pressure, iron can incorporate a small amount of hydrogen into its crystal structure, and at extreme temperatures and pressures, such as might be found in the Earth's core, larger amounts of hydrogen can be incorporated. These substances are the subject of study in industrial metallurgy and planetary geology. (en)
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  • Iron–hydrogen alloy, also known as iron hydride, is an alloy of iron and hydrogen and other elements. Because of its lability when removed from a hydrogen atmosphere, it has no uses as a structural material. At ordinary pressure, iron can incorporate a small amount of hydrogen into its crystal structure, and at extreme temperatures and pressures, such as might be found in the Earth's core, larger amounts of hydrogen can be incorporated. These substances are the subject of study in industrial metallurgy and planetary geology. (en)
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  • Iron–hydrogen alloy (en)
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