Articles | Volume 33, issue 4
Eur. J. Mineral., 33, 485–502, 2021
https://doi.org/10.5194/ejm-33-485-2021

Special issue: Probing the Earth: experiments and mineral physics at mantle...

Eur. J. Mineral., 33, 485–502, 2021
https://doi.org/10.5194/ejm-33-485-2021

Research article 17 Aug 2021

Research article | 17 Aug 2021

Vibrational anisotropy of δ-(Al,Fe)OOH single crystals as probed by nuclear resonant inelastic X-ray scattering

Johannes Buchen et al.

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Cited articles

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Angel, R. J., Mazzucchelli, M. L., Alvaro, M., Nimis, P., and Nestola, F.: Geobarometry from host-inclusion systems: The role of elastic relaxation, Am. Mineral., 99, 2146–2149, https://doi.org/10.2138/am-2014-5047, 2014b. a
Baroni, S., de Gironcoli, S., Dal Corso, A., and Giannozzi, P.: Phonons and related crystal properties from density-functional perturbation theory, Rev. Mod. Phys., 73, 515–562, https://doi.org/10.1103/RevModPhys.73.515, 2001. a
Buchen, J., Marquardt, H., Boffa Ballaran, T., Kawazoe, T., and McCammon, C.: The equation of state of wadsleyite solid solutions: Constraining the effects of anisotropy and crystal chemistry, Am. Mineral., 102, 2494–2504, https://doi.org/10.2138/am-2017-6162, 2017. a
Buchen, J., Sturhahn, W., Ishii, T., and Jackson, J. M.: Single-crystal NRIXS of delta-(Al,Fe)OOH (1.0), CaltechDATA [data set], https://doi.org/10.22002/D1.2050, 2021. a
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Short summary
We investigated the thermal vibrations of 57Fe atoms in the crystal structure of a high-pressure form of the oxyhydroxide compound (Al,Fe)OOH. The results of our nuclear resonant inelastic X-ray scattering experiments on single crystals show that 57Fe atoms vibrate at different frequencies and with different amplitudes when being displaced in different directions. This anisotropy of atomic vibrations is transmitted to related thermal properties and can be described using second-rank tensors.