All kinds of PWO crystals showed the body-centered tetragonal structure in the Raman spectra.

拉曼光谱证实晶体的结构为体心四方结构。

The nanometer tetragonal polycrystal zirconia powder was prepared by the super alkaline method at low temperature.

利用低温超强碱法制备出了纳米四方多晶氧化锆粉体。

The results of XRD and SEM show that the main crystal phase is the non-full-filled tetragonal tungsten bronze structure.

SEM结构分析可知，主晶相为非填满型钨青铜结构四方晶相。

But the tetragonal phase in the surface region transforms easily to monoclinic phase when the samples are exposed to air.

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。

We comprehensively investigate and discuss the relation in the tetragonal, rhombohedral and coexistence phase region of PZT.

我们对PZT四方相区、三角相区和混合相区介电常数与晶格畸变的关系进行了全面研究和探讨。

Under the high temperature and high pressure, the hexagonal graphite crystals can change into the tetragonal diamond crystals.

在高温高压下，六方晶格的石墨转变为立方晶格的金刚石。

We also study the relation between the dielectric constant and lattice distortion of the PT tetragonal and cubic phase region.

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。

The results indicate that the coating is mainly composed of tetragonal and cubic phase and a small amount of monoclinic zirconia.

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 of SEM, XRD and XPS measurements of those films show that all films have single tetragonal structure of scheelite - type.

XRD和XPS分析结果表明，制备的钼酸盐薄膜均为表面均匀致密的四方晶系单相薄膜。

The mineral chalcopyrite usually is found in compact masses or in mixtures with various other mineral as opaque, brass-yellow, tetragonal crystals.

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。

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.

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。

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.

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。

The major phase constituent obviously transforms from cubic paraelectric phase to tetragonal ferroelectric phase after sintering, in which the ferroelectric domains exist.

烧结前后陶瓷相结构明显改变，由原来的立方顺电相为主转变为四方铁电相为主，并存在铁电畴亚结构；

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.

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。

It is found that the increase of oxygen vacancy content can increase the instability of the metastable tetragonal phase and accelerate the transformation to monoclinic zirconia.

结果表明：氧空位的存在与变化不仅影响着氧化锆相结构的稳定性，而且影响着氧化锆的低温相变过程。

The microstructure and phases present in hydroxyapatite(HA) reinforced by tetragonal zirconia polycrystal (TZP) were investigated by using transmission electron microscopy(TEM).

用透射电子显微镜对四方氧化锆多晶（TZP）增韧羟基磷灰石（HA）复合材料的微观相结构进行了观察与分析。

Titanium nitride was synthesized by ammonia reduction and nitridation under flowing ammonia atmosphere while the content and tetragonal phase structure of zirconia was unchanged.

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。

The influence of atmosphere condition on solidification procedure of nanometer tetragonal polycrystals zirconia (YTZP) slurry in the AqueousGelTapeCasting process was investigated.

对纳米y TZP(氧化钇稳定)坯片在新型水基凝胶流延成型工艺中，气氛条件对浆料固化过程的影响进行了研究。

The top part of one inner bolt which matches the blank hole channel of the outer hollow screw is also conical. The rear is provided with a thread and a tetragonal body for holding.

一与外空心螺钉的盲孔道相匹配的内螺栓，内螺栓的尖端部位亦为锥形，尾部设有螺纹和供握持用的四方体。

The results show that the content of tetragonal phase is increasing in BNBT ceramics by direct reaction sintering method but still exhibiting a single phase of perovskite structure.

结果表明，直接反应烧结法不影响BNBT陶瓷的钙钛矿相结构，但可使准同型相界处组成的四方相含量增加；

The present work was to determine the optimum sintering system and properties of the nanometer tetragonal polycrystalline zirconia green body by the aqueous gel tape casting process.

采用水基凝胶流延工艺制备四方多晶氧化锆薄膜，确定合理的烧成制度，并考察薄膜的显微结构与烧结性能。

These disadvantages cannot be overcome by addition of tetragonal zirconia resulting in phase transition toughening, because of the low elastic module of the ceramic artificial bone materials.

由于生物陶瓷材料的弹性模量较小，很难采用添加氧化锆引起的相变增韧来解决上述缺点。

X-ray Diffraction(XRD)was applied to study crystalline properties of PLT films, and XRD patterns of PLT thin films show that there appeared(111)preferred-oriented tetragonal perovskite phase.

用X射线衍射技术（XRD）研究了PLT薄膜结晶性能，结果表明PLT薄膜为（111）择优取向钙钛矿相织构。