The phase composition of a Ê2O – SrO – V2O5 – V2O3 system fragment at 9000Ñ in sealed evacuated quartz ampoules with a residual air pressure of 0.001 mm was investigated. 0.001 mm Hg. Based on the X-ray phase analysis of sintering products, it was concluded that there are three new phases: KSr5V6O15, K3+xSr3-xV6O15, K1+xSrV6x+4O12x+8 (0 ≤ x ≤ 1). The last two phases at temperatures below ~ 77 K are attracted by a magnet. Built phase diagram. The radiographic characteristics of the new compounds are given.