A phase diagram of the Y₂S₃-Y₂O₃, system has been defined from 1000 K to melts for the first time; the enthalpies of phase transitions in the systems have been determined. The monoclinic phase δ-Y₂S₃ (P2₁/m, a = 1.7523(8) nm, b = 0.4010(9) nm, с = 1.0170(7) nm, β = 98.60(6)°; microhardness H = 411 ± 7 HV) transforms at 1716 ± 7 K to the unquenchable high-temperature phase ξ-Y₂S₃, ΔН = 29 ± 6 J/g (7.9 KJ/mol) as determined by DSC. The quenching can’t latch the Y₂S₃-phase. The melting point of Y₂S₃ is 1888 ± 7 K; ΔН = 150 ± 28 J/g (41.1 KJ/mol). Y₂OS₂ has a monoclinic structure (P21/c, а = 0.8256(8) nm, b = 0.6879(8) nm, с = 0.6848(8) nm, β = 99.52(6), Н = 491 ± 13 HV) and melts incongruently at 1790 ± 8 K, ΔН = 190 ± 45 J/g (52 KJ/mol) by the scheme Y₂OS₂ ↔ Y₂O₂S + L (16 mol% Y₂O₃). Y₂O₂S has a hexagonal structure (a = 0.3784(5) nm, c= 0.6584(4) nm, Н = 654 ± 7 HV). Its congruent melting temperature is 2350 ± 40 K as determined by visual polythermal analysis (VPTA). The eutectic formed by Y₂S₃ and Y₂OS₂ phases has the composition 14.0 ± 0.5 mol% Y₂O₃ (0.58Y₂S₃ + 0.42Y₂OS₂) and melting temperature 1770 ± 6 K; ΔН = 215 ± 39 J/g. Between Y₂O₂S and Y₂O₃ phases, there is a eutectic with the coordinates 80 ± 1 mol% Y₂O₃ (0.6Y₂O₂S + 0.4Y₂O₃) and melting temperature 2150 ± 35 K (VPTA).

Y ₂ S ₃ -Y ₂ O ₃系统的相图已从1000 K首次定义为熔融。已经确定了系统中的相变焓。单斜晶相δ-Y ₂小号₃（P2 ₁ / M，A = 1.7523（8）纳米，B = 0.4010（9）处，с= 1.0170（7）处，β= 98.60（6）°;显微硬度H =在1716±7 K将难以抑制高温相ξ-Y 411±7 HV）变换₂小号₃，ΔН= 29±6焦耳/克（7.9 KJ / mol）的通过DSC测定。淬灭不能锁存Y ₂ S ₃相。Y ₂ S ₃的熔点是1888±7 K; ΔН＝ 150±28J / g（41.1KJ / mol）。Y ₂ OS ₂具有单斜晶结构（P 21 / c，а= 0.8256（8）nm，b = 0.6879（8）nm，с= 0.6848（8）nm，β= 99.52（6），Н= 491±13 HV）和熔体固液异在1790±8 K，ΔН= 190±45焦耳/克（52千焦/摩尔）由方案ÿ ₂ OS ₂ ↔ý ₂ ö ₂ S + L（16摩尔％Y ₂ ö ₃）。Y ₂ O ₂ S具有六边形结构（a = 0.3784（5）nm，c = 0.6584（4）nm，Н= 654±7 HV）。通过视觉多热分析（VPTA）测定，其全融温度为2350±40K。由Y ₂ S形成的共晶_3相和Y ₂ OS ₂相的组成为14.0±0.5mol％的Y ₂ O ₃（0.58Y ₂ S ₃ + 0.42Y ₂ OS ₂），熔融温度为1770± 6K 。ΔН= 215±39 J / g。在Y ₂ O ₂ S和Y ₂ O ₃相之间，有一个共晶，坐标为80±1 mol％Y ₂ O ₃（0.6Y ₂ O ₂ S + 0.4Y ₂ O ₃），熔融温度为2150±35 K （VPTA）。