Apparently, the diffusion coefficient is sensitive to impurities or structural challenges in the crystal, but That continues to be to be quantified. For our rough estimates of some time at temperature needed to take away the hydrogen from our samples, the hydrogen diffusion coefficient preferred is that given by Belonoshko https://companyspage.com/story3400380/an-unbiased-view-of-sri-lankan-yellow-sapphire-price-in-india