Ohon Natalia, Stepchuk Roman, Blazhivskyi Kostiantyn, Vasylechko Leonid
Lviv Polytechnic National University, 12 Bandera Street, Lviv, 79013, Ukraine.
Nanoscale Res Lett. 2017 Dec;12(1):148. doi: 10.1186/s11671-017-1937-8. Epub 2017 Feb 23.
Single-phase mixed aluminates-titanates Nd Sr Al Ti O (x = 0.3 ÷ 0.9) were prepared from stoichiometric amounts of constituent oxides NdO, AlO, TiO and strontium carbonate SrCO by solid-state reaction technique in air at 1773 K. Crystal structure parameters of Nd Sr Al Ti O were refined by full-profile Rietveld refinement in space groups R [Formula: see text] c (x = 0.3, 0.5, 0.7 and 0.8) and Pm [Formula: see text] m (x = 0.9). Comparison of the obtained structural parameters with the literature data for the end members of the system NdAlO and SrTiO revealed formation of two kinds of solid solutions NdSrAlTiO with the cubic and rhombohedral perovskite structure. Morphotropic rhombohedral-to-cubic phase transition in NdSrAlTiO series occurs at x = 0.84. Based on the results obtained as well as the literature data for the parent compounds, the tentative phase diagram of the NdAlO-SrTiO pseudo-binary system have been constructed.
通过在空气中于1773 K采用固态反应技术，由化学计量比的组成氧化物Nd₂O₃、Al₂O₃、TiO₂和碳酸锶SrCO₃制备了单相混合铝酸盐 - 钛酸盐Nd₁₋ₓSrₓAl₁₋ₓTiₓO₃（x = 0.3÷0.9）。通过在空间群R[公式：见文本]c（x = 0.3、0.5、0.7和0.8）和Pm[公式：见文本]m（x = 0.9）中进行全谱Rietveld精修，对Nd₁₋ₓSrₓAl₁₋ₓTiₓO₃的晶体结构参数进行了精修。将获得的结构参数与系统NdAlO₃和SrTiO₃端元的文献数据进行比较，揭示了形成了两种具有立方和菱面体钙钛矿结构的固溶体Nd₁₋ₓSrₓAl₁₋ₓTiₓO₃。Nd₁₋ₓSrₓAl₁₋ₓTiₓO₃系列中从菱面体到立方的变晶相转变发生在x = 0.84处。基于所获得的结果以及母体化合物的文献数据，构建了NdAlO₃ - SrTiO₃伪二元系统的初步相图。
