Abstract ZrO2 solid solution crystals partially stabilized with Gd2O3 in the 2.0 to 4.0 mol% concentration range have been grown using the directional melt crystallization in a cold crucible. We show that the crystals have a homogeneous distribution of the components along the length of the crystal, and their chemical composition corresponds to that of the initial charge. The phase composition of the crystals has been studied using X-ray diffraction. The local phase composition in the vicinity of the indentation has been studied using Raman spectroscopy. The microhardness and fracture toughness of the crystals have been studied by indentation. The correlation between the fracture toughness of the crystals and their phase composition and indentation induced transformations has been discussed. We show that an increase in the Gd2O3 concentration in the crystals from 2.8 to 4.0 mol% reduces the content of the transformable tetragonal t phase, its tetragonality degree and the intensity of the indentation induced tetragonal to monoclinic phase transition. These factors are known to eventually reduce the fracture toughness of the crystals with an increase in the Gd2O3 concentration.

中文翻译：

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用 Gd2O3 部分稳定的熔体生长 ZrO2 单晶：相组成和压痕诱导转变

摘要 ZrO2 固溶体晶体在 2.0 至 4.0 mol% 浓度范围内用 Gd2O3 部分稳定，已在冷坩埚中使用定向熔体结晶生长。我们表明晶体沿晶体长度具有均匀的组分分布，并且它们的化学成分对应于初始电荷的化学成分。已使用 X 射线衍射研究了晶体的相组成。使用拉曼光谱研究了压痕附近的局部相组成。已经通过压痕研究了晶体的显微硬度和断裂韧性。已经讨论了晶体的断裂韧性与其相组成和压痕诱导转变之间的相关性。我们表明，将晶体中 Gd2O3 浓度从 2.8 mol% 增加到 4.0 mol% 会降低可转化四方 t 相的含量、其四方度和压痕诱导的四方到单斜相变的强度。已知这些因素最终会随着 Gd2O3 浓度的增加而降低晶体的断裂韧性。