“…Studies have shown that the main factors affecting the distribution and interconversion of boron-containing species in borate solutions include temperature, pH, total boron concentration, and coexisting ions. 9,[17][18][19][20][21][22] On the other hand, x-ray diffraction [23][24][25][26] and extended x-ray absorption fine structure (EXAFS) 27,28 methods are also used to study the structure of borate solutions, giving the hydration number of anions and cations, hydration distance and ion pairs. These studies show that changes in the hydration configuration of cations affect the hydration structure and association structure of borate ions, and changes in the hydration and association structures of borate ions further affect the direction and progress of the hydrolysis, condensation, and depolymerization processes of borate species.…”