| La2O3掺杂SiO2-B2O3-Nb2O5复相微晶玻璃相界及储能性能研究 |
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| 引用本文： | 郭宏伟,白赟,CHI Longxing,赵志龙,刘帅,王毅,李荣悦.La2O3掺杂SiO2-B2O3-Nb2O5复相微晶玻璃相界及储能性能研究[J].硅酸盐通报,2022,41(11):3826-3833. |
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| 作者姓名： | 郭宏伟 白赟 CHI Longxing 赵志龙 刘帅 王毅 李荣悦 |
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| 作者单位： | 1.陕西科技大学材料科学与工程学院,西安 710021; 2.多伦多大学材料科学与工程系,多伦多 M5S3E4; 3.东旭集团有限公司,北京 100036 |
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| 基金项目： | 国家重点研发计划(2017YFB0310201) |
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| 摘 要： | 采用可控析晶法制备了La2O3掺杂的SiO2-B2O3-Nb2O5 (SBN)复相微晶玻璃,利用DSC、Raman、XRD、SEM、铁电和介电性能测试等分析表征了La2O3掺杂对SBN复相微晶玻璃结构与储能性能的影响。结果表明:La2O3掺杂能够有效提高复相微晶玻璃的热稳定性,随着La2O3含量增加,系统析晶势垒增大,热膨胀系数先降低后升高,价键振动加剧,介电常数先增大后减小,介电损耗先减小后增大;掺杂1.00%(摩尔分数)La2O3时,复相微晶玻璃在40 kV/cm电场下的储能密度和储能效率最大,分别为0.031 J·cm-3和77.6%;储能性能主要通过介电常数和击穿场强的协同作用来评价,La2O3能通过提高结构热稳定性和降低介电损耗来提高介电常数,当其引入体系后处于玻璃网络的空隙中,可有效增强材料耐击穿性能;复相微晶玻璃结构可以增加结构无序度,从而降低弛豫损耗,有效提高材料的储能性能。
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| 关 键 词： | SiO2-B2O3-Nb2O5微晶玻璃 La2O3掺杂 储能材料 复相 相界 铁电材料 析晶 |
| 收稿时间： | 2022-07-25 |
Phase Boundary and Energy Storage Performance of La2O3 Doped SiO2-B2O3-Nb2O5 Complex Phase Glass-Ceramics |
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| GUO Hongwei,BAI Yun,CHI Longxing,ZHAO Zhilong,LIU Shuai,WANG Yi,LI Rongyue.Phase Boundary and Energy Storage Performance of La2O3 Doped SiO2-B2O3-Nb2O5 Complex Phase Glass-Ceramics[J].Bulletin of the Chinese Ceramic Society,2022,41(11):3826-3833. |
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| Authors: | GUO Hongwei BAI Yun CHI Longxing ZHAO Zhilong LIU Shuai WANG Yi LI Rongyue |
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| Affiliation: | 1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China; 2. Department of Materials Science and Engineering, University of Toronto, Toronto M5S3E4, Canada; 3. Dongxu Group Co., Ltd., Beijing 100036, China |
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| Abstract: | La2O3 doped SiO2-B2O3-Nb2O5 (SBN) complex phase glass-ceramics were prepared by controlled crystallization method. The effects of La2O3 doping on structure and energy storage performance of SBN complex phase glass-ceramics were characterized by DSC, Raman, XRD, SEM, ferroelectric and dielectric tests. The results show that La2O3 doping can effectively improve the thermal stability of complex phase glass-ceramics. With the increase of La2O3 content, the crystallization barrier of the system increases, the thermal expansion coefficient decreases first and then increases,the valence bond vibration intensifies, the dielectric constant increases first and then decreases, and the dielectric loss decreases first and then increases. When doped with 1.00% (mole fraction) La2O3, the energy storage density and energy storage efficiency of complex phase glass-ceramics under 40 kV/cm are the highest, which are 0.031 J·cm-3 and 77.6%, respectively. The energy storage performance is mainly evaluated by the synergistic effect of dielectric constant and breakdown field strength. La2O3 can improve the dielectric constant by improving structure stability and reducing dielectric loss. When La2O3 is introduced into the system, it is in the voids of glass network, which can effectively enhance the breakdown resistance of material. The complex phase glass-ceramic structure can increase structural disorder, thereby reducing relaxation loss and effectively improving the energy storage performance of material. |
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| Keywords: | SiO2-B2O3-Nb2O5 glass-ceramics La2O3 doping energy storage material complex phase phase boundary ferroelectric material crystallization |
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