Hydrogen-Storing Salt NaCl(H$_2$) Synthesized at High Pressure and High Temperature

X-ray diffraction and Raman scattering measurements, and first-principles calculations are performed to search for the formation of NaCl-hydrogen compound. When NaCl and H $_{2}$ mixture is laser-heated to above 1500 K at pressures exceeding 40 GPa, we observed the formation of NaClH $_{x}$ with $P$ 6 $_{3}$ / $mmc$ structure which accommodates H $_{2}$ molecules in the interstitial sites of NaCl lattice forming ABAC stacking. Upon the decrease of pressure at 300 K, NaClH $_{x}$ remains stable down to 17 GPa. Our calculations suggest the observed NaClH $_{x}$ is NaCl(H $_{2}$ ). Besides, a hydrogen-richer phase NaCl(H $_{2}$ ) $_{4}$ is predicted to become stable at pressures above 40 GPa.

Hydrogen-Storing Salt NaCl(H $_{2}$ ) Synthesized at High Pressure and High Temperature

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Hydrogen-Storing Salt NaCl(H $_{2}$ ) Synthesized at High Pressure and High Temperature

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Hydrogen-Storing Salt NaCl(H22​) Synthesized at High Pressure and High Temperature

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Hydrogen-Storing Salt NaCl(H22​) Synthesized at High Pressure and High Temperature

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Hydrogen-Storing Salt NaCl(H $_{2}$ ) Synthesized at High Pressure and High Temperature

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Hydrogen-Storing Salt NaCl(H $_{2}$ ) Synthesized at High Pressure and High Temperature

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