• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Materials Research >Effect of annealing time on structural and microwave dielectric characteristics of Li_2ZnTi_3O_8 ceramics
【24h】

Effect of annealing time on structural and microwave dielectric characteristics of Li_2ZnTi_3O_8 ceramics

机译：退火时间对Li_2ZnTi_3O_8陶瓷结构和微波介电特性的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In the present work, the Li_2ZnTi_3O_8 ceramics were prepared via the solid-state reaction method, afterward annealed at 800 ℃ in a time variation from 4 to 20 h. The ordering, microstructures and dielectric properties were investigated using x-ray diffraction, scanning electron microscopy, network analyzer, and Raman spectroscopy. The most significant enhancement of quality factor is obtained in the sample annealed for 20 h, while the dielectric constant and temperature coefficient of resonant frequency change slightly. This result mainly attributes to the enhancement of ordering, which could be related to the increase in the Zn-O bond strength in ZnO_4 tetrahedra. Meanwhile, the full-width at half-maximum of A_(1g) mode decreased with higher annealing time, which suggested less variation in the Zn-O bond length and a higher degree of ordering. The best combination of microwave dielectric characteristic is obtained in the sample annealed at 800 ℃ for 20 h: Q × f = 112,400 GHz, ε_r = 24.500, and τ_f = -11 ppm/℃.
机译：在本工作中，通过固相反应方法制备了Li_2ZnTi_3O_8陶瓷，然后在800℃退火4至20 h。使用X射线衍射，扫描电子显微镜，网络分析仪和拉曼光谱研究了有序，微观结构和介电性能。在退火20 h的样品中，品质因数得到了最显着的提高，而介电常数和谐振频率的温度系数则略有变化。这个结果主要归因于有序性的增强，这可能与ZnO_4四面体中Zn-O键强度的增加有关。同时，随着退火时间的延长，A_（1g）模式的半峰全宽减小，这表明Zn-O键长的变化较小，有序度较高。在800℃退火20 h的样品中可获得微波介电特性的最佳组合：Q×f = 112,400 GHz，ε_r= 24.500，τ_f= -11 ppm /℃。

著录项

  • 来源
    《Journal of Materials Research》 |2015年第10期|1619-1628|共10页
  • 作者

    Hamid Taghipour-Armaki; Ehsan Taheri-Nassaj; Maryam Bari;

  • 作者单位

    Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115-143, Iran;

    Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115-143, Iran;

    Department of Materials Science and Engineering, Tarbiat Modares University, Tehran 14115-143, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号