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The aragonite-structure carbonates—strontianite (SrCO3) and witherite (BaCO3)—were investigated by synchrotron X-ray diffraction combined with diamond anvil cells up to 30 and 15 GPa at room temperature, respectively. Phase transitions in SrCO3 (Pmcn to P21212) and BaCO3 (Pmcn to Pmmn) were observed at 22.2–26.9 and 9.8–11.2 GPa, respectively. Both strontianite and witherite display anisotropic linear...
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