共掺杂实现铬酸镧的室温闪烧

doi:10.16552/j.cnki.issn1001-1625.2026.0107

摘要/Abstract

摘要：

掺杂铬酸镧陶瓷具备高导电性及良好的高温稳定性，拥有广阔的应用前景。然而铬酸镧材料难于致密化，为降低其烧结温度、简化流程，将闪烧技术应用于该材料的制备。同时研究Co离子单掺杂及A/B位Ca-Co离子共掺杂铬酸镧的结构、本征特性及其对闪烧行为的影响。结果表明，相比于LaCr_0.8Co_0.2O₃，Ca²⁺的进一步掺杂可诱导氧空位并优化载流子特性。电场驱动下的快速迁移降低了闪烧发生的阈值，从而在低电场、室温条件下实现La_0.9Ca_0.1Cr_0.8Co_0.2O₃陶瓷的快速烧结，闪烧60 s后达到全致密结构。相较于1 650 ℃下的传统高温烧结，制备效率也大幅提升。本研究明确了掺杂对铬酸镧低温闪烧行为的调控作用，为类型功能陶瓷的室温烧结提供了可行路径，也为直流闪烧技术在陶瓷材料节能制备中的应用提供了实验支撑与理论参考。

关键词: 铬酸镧, 室温闪烧, 共掺杂, 氧空位, 阈值, 直流电场

Abstract:

Doped lanthanum chromite ceramics possess high electrical conductivity and excellent high-temperature stability， demonstrating broad application prospects. However， lanthanum chromite materials are difficult to densify. In order to lower their sintering temperature and simplify the fabrication process， this paper applied the flash sintering technique to the preparation of this type of material. The effects of Co ion single doping and A/B-site Ca-Co ions co-doping on the structure， intrinsic properties， and flash sintering behavior of lanthanum chromite were investigated. The results indicate that， compared with LaCr_0.8Co_0.2O₃， further doping with Ca²⁺ induces oxygen vacancies and optimizes the charge carrier characteristics. The rapid migration driven by the electric field reduces the threshold value conditions required for the onset of flash sintering， thereby ultimately enabling the rapid sintering of La_0.9Ca_0.1Cr_0.8Co_0.2O₃ ceramics under a low electric field at room temperature. A fully dense structure is achieved after flash sintering for 60 s. Additionally， the fabrication efficiency is substantially improved compared to conventional high-temperature sintering at 1 650 ℃. This study elucidates the modulating effect of doping on the flash sintering behavior at low temperature of lanthanum chromite， offering a feasible pathway for the room-temperature sintering of functional ceramics of this type. It also provides experimental evidence and a theoretical reference for the application of direct-current flash sintering technology in the energy-efficient preparation of ceramic materials.

Key words: lanthanum chromate, room-temperature flash sintering, co-doping, oxygen vacancy, threshold value, direct-current electric field

中图分类号:

TQ174.6⁺5

关丽丽, 武利, 司志鹏, 卞梓恒. 共掺杂实现铬酸镧的室温闪烧[J]. 硅酸盐通报, 2026, 45(8): 2882-2889.

GUAN Lili, WU Li, SI Zhipeng, BIAN Ziheng. Room-Temperature Flash Sintering of Lanthanum Chromate Through Co-Doping[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(8): 2882-2889.

图/表 8

图1 材料合成与闪烧过程示意图

Fig.1 Schematic diagram of material synthesis and flash sintering process

图2 粉体的XRD Rietveld精修图

Fig.2 XRD Rietveld refinement plots of powders

表1 晶体结构信息

Table 1 Crystal structure information

Crystal	LCC	LCCC
Space group	Pnma	Pnma
a/Å	5.431 84	5.407 90
b/Å	7.736 02	7.725 33
c/Å	5.500 48	5.485 39
Unit cell volume/Å³	231.135	229.168

图3 不同电场强度下电流密度随环境温度的变化

Fig.3 Current density as a function of ambient temperature under different electric field strengths

图4 不同烧结条件下样品的微观形貌

Fig.4 Microstructure of samples under different sintering conditions

图5 样品的禁带宽度对比

Fig.5 Band gap comparison of samples

图6 LCC和LCCC的XPS谱

Fig.6 XPS spectra of LCC and LCCC

表2 O 1s定量计算对应的物种含量与比例

Table 2 Species content and proportion corresponding to quantitative calculation of O 1s

Sample	O_lat atomic fraction/%	O_ads atomic fraction/%	O_ads/O_lat
LCC	51.14	46.74	0.91
LCCC	46.08	49.93	1.08

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