Crystalline phase transition information induced by high temperature susceptibility transformations in bulk PMP-YBCO superconductor growth in-situ

• It was the first time we measured the susceptibility of bulk YBCO in powder-melting-process at high temperature up to 1060 °C.
• It revealed that the crystalline phase transition of bulk PMP-YBCO growth in process.
• A new discovery of Y123 phase pre-formed then melted in heating stage has been found.
• It discovered that Y123 crystal solidification started at 1004 °C in cooling stage in PMP route.

The dynamic susceptibility transformations of bulk HTSC PMP-YBCO growth have been investigated from 200 °C up to 1060 °C by the Faraday Balance in-situ. It revealed that the crystalline phase transitions of bulk PMP-YBCO growth in process. A new discovery of Y123 phase pre-formed then melted in heating stage has been found. It also discovered that Y123 crystal solidification started at 1004 °C in cooling stage. Before Y123 solidification the liquid phase CuO change to Cu2O reciprocally as well as the copper ion valence changed between divalent Cu2+ and trivalent Cu1+ each other. It was essential to keep quantities of CuO phase instead of the Cu2O for Y123 crystal solidification.