BaTiO_(3)陶瓷的低温冷烧结制备及性能研究  

Preparation and Properties of BaTiO_(3)Ceramics by Low Temperature Cold Sintering

作　　者：韦婷婷 徐华蕊[1] 朱归胜[1] 龙神峰 张秀云[1] 赵昀云[1] 江旭鹏 宋金杰 郭宁杰 龚祎鹏 WEI Tingting;XU Huarui;ZHU Guisheng;LONG Shenfeng;ZHANG Xiuyun;ZHAO Yunyun;JIANG Xupeng;SONG Jinjie;GUO Ningjie;GONG Yipeng(Engineering Research Center of Electronic and Information Materials and Devices,Ministry of Education,Guangxi Key Laboratory of Information Materials,College of Materials Science and Engineering,Guilin University of Electronic Science and Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学,材料科学与工程学院,电子信息材料与器件教育部工程研究中心,广西信息材料重点实验室,桂林541004

出　　处：《无机材料学报》2022年第8期903-910,共8页Journal of Inorganic Materials

基　　金：国家自然科学基金重点项目(U21A2065);广西科技计划项目(桂科AA21077018,桂科AB20297053);“科技助力经济2020”重点专项(SQ2020YFF0425649);广西信息材料重点实验室基金(201002-Z)。

摘　　要：近年来,冷烧结低温制备陶瓷引起了很大关注,并在BaTiO_(3)陶瓷的制备上取得了一定进展。为了提高冷烧结BaTiO_(3)陶瓷性能,本研究采用水热法制备了分散性好、粒径为100 nm的四方相(晶格参数c/a为1.0085)BaTiO_(3)粉末。采用0.1 mol/L的乙酸在100℃/1 h的条件下对粉末进行水热活化处理。以质量分数10%Ba(OH)_(2)·8H_(2)O为熔剂,在350 MPa、400℃/1 h的条件下对粉体进行冷烧结,最后经600℃/0.5 h退火获得了相对密度为96.62%、晶粒尺寸为180 nm,常温介电(ε_(r))为2836,介电损耗(tanδ)低至0.03的BaTiO_(3)陶瓷。乙酸处理后高活性粉末表面形成的非晶钛层有效促进了陶瓷的致密化,抑制了杂相的生成和晶粒长大,提高了介电性能,大幅改善了冷烧结BaTiO_(3)陶瓷出现的介电弥散现象,从而实现了BaTiO_(3)陶瓷的低温冷烧结制备。Preparation of ceramics by cold sintering process has attracted great attention,and some progress has been made in the preparation of BaTiO_(3)ceramics.In order to improve the performance of cold sintered BaTiO_(3)ceramics,BaTiO_(3)powder with good dispersion,particle size of 100 nm and tetragonality(crystal parameter c/a of 1.0085)was prepared by hydrothermal method,and then the powder was hydrothermally activated at 100℃for 1 h with 0.1 mol/L acetic acid.Dense BaTiO_(3)ceramics were prepared by the Cold Sintering Process at 400℃,under a uniaxial pressure of 350 MPa for 1 h using 10%Ba(OH)_(2)·8H_(2)O(in mass)as flux.The as-prepared ceramic pellets were further annealed at 600℃for 0.5 h.In the end,BaTiO_(3)ceramic sample obtained excellent characteristics with relative density of 96.62%,grain size of 180 nm,dielectric constant(ε_(r))of 2836,and dielectric loss(tanδ)of 0.03.An amorphous titanium layer is formed on the surface of the highly active powder after acetic acid treatment,which effectively promotes the densification of ceramics,inhibits the formation of impurity phases and grain growth,improves the dielectric properties,greatly improves the dielectric dispersion phenomenon of cold sintered BaTiO_(3)ceramics,and realizes the low temperature cold sintering of BaTiO_(3)ceramics.

关 键 词：纳米BaTiO_(3) 介电陶瓷 冷烧结 低温制备 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]