High-pressure transitions and thermochemistry of MGeO3 (M=Mg, Zn and Sr) and Sr-silicates: systematics in enthalpies of formation of A2+B4+O3 perovskites

Structural Relaxation of Oxide Compounds from the High-Pressure Phase

“…, Sr 2+ , and Ba 2+ cations are stabilized as hexagonal and/or cubic forms under high pressure [34][35][36][37][38]. These transformations have been confirmed by high-pressure experiments.…”

Cubic perovskite polymorph of strontium metasilicate at high pressures

“…Furthermore high-pressure and high-temperature experiments indicate that SrSiO 3 III decomposes to SrSi 2 O 5 plus Sr 2 SiO 4 at about 11 GPa and 1000 °C, which is similar to that of CaSiO 3 . At much higher pressures of above about 20 GPa, the thermodynamic stable phase of SrSiO 3 is identified as a sixlayer-repeated hexagonal perovskite (6H-type, P6 3 /mmc, Z = 6) Akaogi et al 2005). It is the same structure as the hexagonal BaTiO 3 perovskite.…”

Single-crystal X-ray diffraction study of SrGeO3 high-pressure perovskite phase at 100 K

“…Detailed studies on the crystal structure of this compound are important for gaining insights into the correlation between its electronic conduction property and chemical bonding nature. The SrGeO 3 perovskite has also been investigated from interests as an analogue of CaSiO 3 and MgSiO 3 perovskites, major constituents in the Earth's lower mantle [2][3][4]. Its structural study can also provide geophysical imprecations in the Earth's interior.…”