Li2O-B2O3-SiO2玻璃相对BaAl2Si2O8结构及微波介电性能的影响

doi:10.15541/jim20180582

无机材料学报 ›› 2019, Vol. 34 ›› Issue (10): 1091-1096.DOI: 10.15541/jim20180582 CSTR: 32189.14.10.15541/jim20180582

Li₂O-B₂O₃-SiO₂玻璃相对BaAl₂Si₂O₈结构及微波介电性能的影响

黄龙,丁士华(),张晓云,严欣堪,李超,朱惠

西华大学材料科学与工程学院, 成都 610039

收稿日期:2018-12-13 修回日期:2018-01-22 出版日期:2019-09-23 网络出版日期:2019-05-29
作者简介:黄龙(1992-), 男, 硕士研究生. E-mail: 540555281@qq.com
基金资助:
教育部春晖计划项目(Z2011077);四川省特种材料及制备技术重点实验室开放课题资助项目(szjj2017-059);四川省教育厅资助项目(14ZB0126);四川省粉末冶金工程技术中心资助项目(SC-FMYJ2017-04);四川省粉末冶金工程技术中心资助项目(SC-FMYJ2017-07);国家自然科学基金(11074203);西华大学研究生创新基金(ycjj2018012);西华大学研究生创新基金(ycjj2018013)

Structure and Microwave Dielectric Property of BaAl₂Si₂O₈with Li₂O-B₂O₃-SiO₂ Glass Addition

HUANG Long,DING Shi-Hua(),ZHANG Xiao-Yun,YAN Xin-Kan,LI Chao,ZHU Hui

School of Materials Science and Engineering, Xihua University, Chengdu 610039, China

Received:2018-12-13 Revised:2018-01-22 Published:2019-09-23 Online:2019-05-29
Supported by:
Chun Hui Project of the Ministry of Education(Z2011077);Open Research Subject of Key Laboratory of Special Materials and Preparation Technology of Sichuan Province(szjj2017-059);Foundation of Sichuan Educational Committee(14ZB0126);Opening Foundation of Sichuan Province Engineering Center for Powder Metallurgy(SC-FMYJ2017-04);Opening Foundation of Sichuan Province Engineering Center for Powder Metallurgy(SC-FMYJ2017-07);National Natural Science Foundation of China(11074203);Graduate Innovation Foundation of Xihua University(ycjj2018012);Graduate Innovation Foundation of Xihua University(ycjj2018013)

摘要/Abstract

摘要：

采用固相工艺制备BaAl₂Si₂O₈-xwt%Li₂O-B₂O₃-SiO₂(x=0, 0.1, 0.3, 0.5, 1.0, 2.0)陶瓷。探究不同含量的Li₂O-B₂O₃-SiO₂(LBS)玻璃相对BaAl₂Si₂O₈(BAS)陶瓷的烧结温度、结构及微波介电性能的影响。结果表明: LBS玻璃相可明显降低BAS陶瓷的烧结温度, 并促进BAS陶瓷晶粒长大和晶体结构由六方相转变为单斜相。当x=0.1时, 六方相即可全部转变为单斜相, 在0.1≤x≤2.0范围内, BAS陶瓷晶体结构均为单斜相。添加0.3wt%的LBS玻璃相可促进BAS样品密度、介电常数和品质因数增大, 谐振频率温度系数绝对值减小。在x=0.3, 烧结温度为1275 ℃时, 可获得具有较好品质因数的单斜钡长石, 其介电性能: ε_r=6.74, Q×f=34570 GHz, τ_f= -15.97×10 ^-6/℃。

关键词: 钡长石, 单斜相, 晶体结构, 介电性能

Abstract:

The BaAl₂Si₂O₈-xwt%Li₂O-B₂O₃-SiO₂ (x=0, 0.1, 0.3, 0.5, 1.0, 2.0) ceramics with small amount of Li₂O-B₂O₃-SiO₂ (LBS) glass addition were prepared by solid state sintering. The sintering temperature, structure and microwave dielectric properties of BaAl₂Si₂O₈ (BAS) ceramics with xwt%LBS glass addition were investigated. The results show that the LBS glass can greatly reduce the sintering temperature, promote the growth of grain and the transformation of hexacelsian-to-celsian of BAS ceramics. As x=0.1, all the hexacelsian were transformed into celsian, and the second phase was not observed as x≤2.0. The 0.3wt%LBS glass can promote the density, dielectric constant and Q × f value increase, and the absolute value of τ_f decrease. Especially, the BAS ceramics with the 0.3wt%LBS glass addition sintered at 1275 ℃ shows a good Q × f of 34570 GHz, and the dielectric properties are ε_r= 6.74 and τ_f = -15.97 × 10 ^-6/℃.

Key words: barium feldspar, celsian, crystal structure, dielectric property

中图分类号:

TQ174

黄龙, 丁士华, 张晓云, 严欣堪, 李超, 朱惠. Li₂O-B₂O₃-SiO₂玻璃相对BaAl₂Si₂O₈结构及微波介电性能的影响[J]. 无机材料学报, 2019, 34(10): 1091-1096.

HUANG Long, DING Shi-Hua, ZHANG Xiao-Yun, YAN Xin-Kan, LI Chao, ZHU Hui. Structure and Microwave Dielectric Property of BaAl₂Si₂O₈with Li₂O-B₂O₃-SiO₂ Glass Addition[J]. Journal of Inorganic Materials, 2019, 34(10): 1091-1096.

图/表 10

图1 BAS-xwt%LBS陶瓷样品线收缩率和密度随烧结温度的变化曲线(a), BAS陶瓷样品密度随LBS玻璃相添加量的变化曲线(b)

Fig. 1 Line shrinkage and density of BAS-xwt%LBS ceramic sample as a function of sintering temperature (a), and the relationship between density and content of LBS glass (b)

图2 LBS玻璃的DSC曲线

Fig. 2 DSC curve of LBS glass

表1 不同LBS玻璃相添加量与对应的烧结温度

Table 1 Content of LBS glass and corresponding sintering temperature

x/wt%	0	0.1	0.3	0.5	1.0	2.0
T/℃	1400	1350	1275	1250	1200	1025

图3 BAS-xwt%LBS陶瓷样品的XRD谱图

Fig. 3 XRD patterns of BAS-xwt%LBS ceramic samples

表2 BAS-xwt%LBS样品的晶格常数与晶胞体积

Table 2 Lattice constant and unit cell volume of BAS-xwt%LBS samples

x/wt%	a/nm	b/nm	c/nm	V/nm³
0.1	0.864121	1.304721	0.720215	0.73558
0.3	0.864383	1.304980	0.720196	0.73612
0.5	0.864474	1.304825	0.720159	0.73614
1.0	0.864824	1.304541	0.720327	0.73623
2.0	0.864586	1.305215	0.720430	0.73656

图4 六方BAS晶体结构(a)和单斜BAS晶体结构(b)

Fig. 4 Crystal structures of hexacelsian (a) and celsian (b)

图5 BAS-xwt%LBS陶瓷样品的晶粒尺寸分布及表面SEM照片

Fig. 5 Grain size distribution and surface SEM images of BAS-xwt%LBS ceramic samples

图6 BAS陶瓷样品的介电常数与LBS玻璃相添加量的关系曲线

Fig. 6 Relationship curves between the dielectric constant of BAS ceramic samples and the content of LBS glass

图7 BAS-xwt%LBS陶瓷样品的Q×f值随烧结温度的变化曲线(a)和BAS陶瓷样品Q×f值随LBS玻璃相添加量的变化曲线(b)

Fig. 7 Q×f value of BAS-xwt%LBS ceramic as a function of sintering temperature (a) and the relationship between Q×f value and content of LBS glass (b)

图8 BAS陶瓷样品的τf值随LBS玻璃相添加量的变化曲线

Fig. 8 Relationship curve between the τf of BAS ceramic samples and the content of LBS glass

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Li₂O-B₂O₃-SiO₂玻璃相对BaAl₂Si₂O₈结构及微波介电性能的影响

Structure and Microwave Dielectric Property of BaAl₂Si₂O₈with Li₂O-B₂O₃-SiO₂ Glass Addition

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