Powders based on the ZrO₂–7 wt % Y₂O₃ system, into which oxides of rare-earth elements (REE)—La, Nd, and Pr—were introduced in the form of the concentrate in an amount from 5 to 15 wt %, are prepared by chemical coprecipitation from inorganic precursors. It is established that an increase in the concentrate content leads to a shift in the temperature maxima of thermal effects into the range of high temperatures from 450 to 505°C. The influence of the annealing temperature in a range of 600–1200°C on the phase transformations of the ZrO₂–7% Y₂O₃–REE systems is investigated using Raman spectroscopy. These studies show that the phase composition of powders includes tetragonal zirconium dioxide ZrO₂, regardless of the concentrate content. The influence of the sintering temperature on the compaction of synthesized powders and ceramic phase composition and microstructure is investigated. It is revealed that ceramics with the 10% REE concentrate has the largest compaction rate during sintering, while an increase in the concentrate content to 15% leads to the retardation of compaction during sintering. The largest open porosity at all sintering temperatures is inherent to ceramics with 15% REE. It is noted that a decrease in intensity of the peaks of the Raman spectra and their broadening are observed with an increase in the sintering temperature for the samples with 10 and 15% REE concentrate, which is associated with the formation of the tetragonal modification of another type. The results of atomic force microscopy show that the isolation of a new phase having faceting and layered structure occurs in the structure of ceramics containing 15% REE concentrate after sintering at 1350°C.

中文翻译：

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稀土元素浓度对高温相稳定化和ZrO 2 –7Y 2 O 3基陶瓷性能的影响

基于ZrO ₂ –7 wt％Y ₂ O ₃系统的粉末，以5至15的浓缩物形式引入稀土元素（REE）-La，Nd和Pr-的氧化物重量％是通过化学共沉淀从无机前体制备的。可以确定的是，精矿含量的增加导致热效应的最大温度转变为从450到505°C的高温范围。退火温度在600–1200°C范围内对ZrO ₂ –7％Y ₂ O ₃的相变的影响–REE系统使用拉曼光谱法进行研究。这些研究表明，粉末的相组成包括四方二氧化锆ZrO ₂，无论浓缩物含量如何。研究了烧结温度对合成粉末的致密性，陶瓷相组成和微观结构的影响。揭示了具有10％REE浓缩物的陶瓷在烧结期间具有最大的压实率，而浓缩物含量增加到15％导致烧结期间的压实延迟。在所有烧结温度下最大的开孔孔隙率是REE含量为15％的陶瓷所固有的。注意到，对于具有10％和15％REE精矿的样品，随着烧结温度的升高，观察到拉曼光谱峰强度的降低和它们的展宽，这与另一种四方修饰的形成有关。类型。