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拉曼光谱证实晶体的结构为体心四方结构。All kinds of PWO crystals showed the body-centered tetragonal structure in the Raman spectra.

随着掺杂量的增加，相转变，从四方相三方相。With the increasing of doping amounts, phases shift from tetragonal phase to rhombohedral phase.

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通过掺杂金属元素的方法可以提高氧化锆的稳定性、增强酸性和相关的反应性能。Doping other metal species may stabilize tetragonal phase of ZrO_2 and increase its acidity strength.

利用低温超强碱法制备出了纳米四方多晶氧化锆粉体。The nanometer tetragonal polycrystal zirconia powder was prepared by the super alkaline method at low temperature.

尽管惰性气氛和还原气氛下焙烧样品有利于四方相的稳定，但样品暴露于空气中后，表面四方相较易转变为单斜相。But the tetragonal phase in the surface region transforms easily to monoclinic phase when the samples are exposed to air.

在高温高压下，六方晶格的石墨转变为立方晶格的金刚石。Under the high temperature and high pressure, the hexagonal graphite crystals can change into the tetragonal diamond crystals.

我们还研究了PT四方相区和立方相区介电常数与晶格畸变的关系。We also study the relation between the dielectric constant and lattice distortion of the PT tetragonal and cubic phase region.

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最后造出了平面正方形、五角双锥和D_4对称等构型的杂化键函，作为本法应用的例。Examples are given for the hybrid orbitals of tetragonal plane, pentagonal bipyramid and D_4 symmetry using the present method.

结果表明，涂层主要以四方相和立方相构成，并含有少量的单斜相。The results indicate that the coating is mainly composed of tetragonal and cubic phase and a small amount of monoclinic zirconia.

介绍了以四角棱柱体土方公式为计算模型的试算法确定大型场地平整最优设计标高近似解的方法。In this paper, the approximation calculation method based on calculation model of earthwork formula of tetragonal prism is described.

在氢气存在的条件下，单斜氧化锆上生成甲烷而在四方氧化锆上则生成甲酸盐。In the case of CO2 hydrogenation, methane was formed on monoclinic zirconia while formate species was observed on tetragonal zirconia.

本实验证实了氧化锆中存在成核相变。文中对成核相变以及由应力诱导的相变作了比较。The nucleation transformation in tetragonal ZrO_2 has been observed for the first time and compared with stress-induced transformation.

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采用引入有机添加剂的低温超强碱法制备出纳米四方多晶氧化锆粉体。Nanometer tetragonal polycrystal zirconia powder was prepared by the milling method in the super-alkaline medium containing organic addition.

黄铜矿通常以不透明的黄铜色的四角形结晶的方式在紧密物质或和其他各种矿物质混合体中被发现。The mineral chalcopyrite usually is found in compact masses or in mixtures with various other mineral as opaque, brass-yellow, tetragonal crystals.

此外，还描述了由于化学组成不均匀而在四方氧化锆晶粒中形成的一小区域及其相变过程。In addition, the small area formed in tetragonal ZrO_2 grain due to chemical composition inhomogeneity and the process of the transformation have also been described.

这可能是由于在缺氧条件下样品表面形成了一种具有氧空位的扭曲结构，这种结构可以阻止四方相到单斜相的转变。It is possible that oxygen vacancies formed in the surface region in the absence of oxygen can prevent the transformation from the tetragonal to the monoclinic phase.

用有限元方法研究了复合PSZ材料立方到四方相变过程中的残余应力及其对材料微观结构的影响。The residual stress and microstructure of complexed PSZ ceramics during the process of cubic to tetragonal phase transformation were studied by finite element method.

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高对称点的振动模的对称性，在此基础上提出了BZ边界M点声子的软化应与四方相到单斜相的相度有关。On the basis of the analyses, it is suggested that softening of a phonon τM2 at BZ boundary M point is associated with the tetragonal to monoclinic phase transition in ZrO2.

当暴露于空气中时，表面氧空位能够捕获空气中的氧，有利于表面四方相转变为单斜相。When the sample is exposed to air, the elimination of these vacancies by the incorporation of oxygen facilitates the transformation from the tetragonal to the monoclinic phase.

采用氨气还原氮化法，在流动的氨气氛下原位反应生成氮化钛，同时保持四方相氧化锆含量和结构不变。Titanium nitride was synthesized by ammonia reduction and nitridation under flowing ammonia atmosphere while the content and tetragonal phase structure of zirconia was unchanged.