Iodine local environment in high pressure borosilicate glasses: An X-ray photoelectron spectroscopy and X-ray absorption spectroscopy investigation

•Iodine is dissolved as iodide (I−) in high pressure borosilicate glasses.•Both alkali and alkaline-earth cations act as a charge compensator to I− species.•The absence of iodate (I5+) suggests that there is a complex interplay between I− species and oxygen species within the glass structure.