利用X-射线衍射分析和电子显微镜分析的结果，确定堇青石窑具的多晶结构和各晶相的含量；
The Polycrystalline structure and the phase composition of cordierite kiln furniture are deter-mined by means of X-ray and electron microscope.
XRD分析表明室温时此系列多晶样品都是单相，具有钙钛矿结构。
XRD analysis of these samples indicated this series of polycrystalline samples possess perovskite structure at room temperature.
设计了一种称之为多晶硅覆盖树技状结构的双极型微波功率晶体管。
A new device structure of silicon bipolar microwave power transistors with so called tree overlay geometry polysilicon emitter has been designed.
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