Temperature and pressure dependence of the fluorescence spectrum of high-pressure synthetic corundum-type Ga2O3:Cr3+, structural stability, and crystal growth under high pressure

Hitoshi Yusa; Masashi Miyakawa

doi:10.1063/5.0246260

Journal article Temperature and pressure dependence of the fluorescence spectrum of high-pressure synthetic corundum-type Ga2O3:Cr3+, structural stability, and crystal growth under high pressure

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Hitoshi Yusa, Masashi Miyakawa. Temperature and pressure dependence of the fluorescence spectrum of high-pressure synthetic corundum-type Ga2O3:Cr3+, structural stability, and crystal growth under high pressure. Journal of Applied Physics. 2025, 137 (3), . https://doi.org/10.1063/5.0246260

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The pressure dependence of the R1 and R2 peaks of the fluorescence spectra of high-pressure synthesized corundum-type Ga2O3:Cr3+ was measured up to 50 GPa using a diamond anvil cell pressurized at room temperature in argon medium. The temperature dependence of the R1 and R2 peaks was measured at low temperatures under ambient pressure from 303 K to 83 K. From the measurement results, the pressure scale and low-temperature scale were determined using R1 and R2. X-ray diffraction experiments at high pressure, which were performed to confirm the effective range of the pressure scale, showed that the corundum structure undergoes a phase transition to a Rh2O3(II)-type structure at 55–70 GPa; this pressure scale is thus valid up to approximately 55 GPa. We also investigated the crystal growth time to optimize the crystal size of Ga2O3:Cr3+ for diamond anvil cell experiments.

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