• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Science and Technology of Advanced Materials >Functioning of traditional ceramics 12CaO·7AlK_2OK_3 utilizing built-in nano-porous structure
【24h】

Functioning of traditional ceramics 12CaO·7AlK_2OK_3 utilizing built-in nano-porous structure

机译：内置纳米孔结构的传统陶瓷12CaO·7AlK_2OK_3的功能

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

This paper briefly reviews our approach to render active functions to micro porous crystal 12CaO·7Al_2O_3 (C12A7), which is known as a constituent of alumina cement, utilizing nano-space and topology of sub-nanometer-sized cages inherent to the crystal structure. Each cage with a positive charge is coordinated by 12 cages to form a three-dimensional structure. This structure is a similar to a close packing of sphere except that each opening wall of a cage is shared with a neighboring cage. Free oxygen ion O~(2-) accommodates in 1/6 of the cages to reserve electro neutrality in the stoichiometric state. We replaced this free oxygen ion by other active anions such as O~-, H~-, and electron, aiming at emergence of novel function. C12A7:O~- exhibited strong oxidation power enough to oxide Pt, and field-assisted thermionic O~- emission to several μA levels, while conversion of insulator to persistent electronic conductor by illumination with ultraviolet radiation was discovered in C12A7:H~- sample. Further, almost all of the free O~(2-) ions in the cages were successfully replaced by electrons by a chemical treatment using metallic Ca. The resulting material, which has a composition [Ca_(24)Al_(28)O_(64)]~(4+)(4e~-) and a high conductivity, ～ 100 S cm~(-1) at 300 K, is a first room-temperature stable electride, in which electrons work as anions. The present approach to novel function emergence by solely employing abundant oxide materials and fully utilizing nanostructure provides a way for material research for future to be done under severe circumstance of environment and resource.
机译：本文简要回顾了我们利用纳米空间和晶体结构固有的亚纳米尺寸笼形结构，将活性功能赋予微孔晶体12CaO·7Al_2O_3（C12A7）（称为氧化铝水泥的一种成分）的方法。每个带正电荷的笼子由12个笼子协调形成三维结构。这种结构类似于球体的紧密堆积，不同的是，笼子的每个开口壁都与相邻的笼子共享。游离氧离子O〜（2-）容纳在1/6的笼中，以化学计量状态保留电中性。我们用其他活性阴离子（例如O〜-，H〜-和电子）取代了这种游离氧离子，旨在出现新功能。 C12A7：O〜-表现出足以氧化Pt的强氧化能力，并且场辅助的热电子O〜-发射到几μA的水平，而在C12A7：H〜-样品中发现绝缘体通过紫外线照射转化为持久性电子导体。此外，通过使用金属Ca进行化学处理，笼中几乎所有的游离O〜（2-）离子均被电子成功取代。所得材料在300 K时具有组成[Ca_（24）Al_（28）O_（64）]〜（4 +）（4e〜-）和高电导率〜100 S cm〜（-1），是第一种室温稳定的电子，其中电子充当阴离子。仅通过使用丰富的氧化物材料并充分利用纳米结构来实现新功能出现的本方法为在严重环境和资源情况下进行未来的材料研究提供了一种途径。

著录项

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