Thermochemical Mechanism of Optimized Lanthanum Chromite Heaters for High-Pressure and High-Temperature Experiments

Tao Xia; Yifeng Han; Chuanhui Zhu; Zhongxiong Sun; Chongyang Yuan; Qi Cui; Jin-Guang Cheng; Wei Du; Wenting Li; Kui Xie; Keke Huang; Shouhua Feng; David Walker; Man-Rong Li

doi:10.1021/acsami.2c07639

Thermochemical Mechanism of Optimized Lanthanum Chromite Heaters for High-Pressure and High-Temperature Experiments

ACS Appl Mater Interfaces. 2022 Jul 20;14(28):32244-32252. doi: 10.1021/acsami.2c07639. Epub 2022 Jul 6.

Authors

Tao Xia¹, Yifeng Han¹, Chuanhui Zhu¹, Zhongxiong Sun¹, Chongyang Yuan¹, Qi Cui², Jin-Guang Cheng², Wei Du³, Wenting Li⁴, Kui Xie⁴, Keke Huang⁵, Shouhua Feng⁵, David Walker⁶, Man-Rong Li¹

Affiliations

¹ Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
² Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, P. R. China.
³ State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, P. R. China.
⁴ Key Laboratory of Design & Assembly of Functional Nanostructures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China.
⁵ State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China.
⁶ Lamont Doherty Earth Observatory, Columbia University, 61 Route 9W, PO Box 1000, Palisades, New York 10964, United States.

PMID: 35792079
DOI: 10.1021/acsami.2c07639

Abstract

High-pressure heaters in large volume presses must reconcile potentially contradictory properties, and the whole high-pressure and high-temperature (HPHT) community has been engaged for years to seek a better heater. LaCrO₃ (LCO)-based ceramic heaters have been widely applied in multianvil apparatus; however, their performance is far from satisfactory, motivating further research on the chemical optimization strategy and corresponding thermochemical mechanism. Here, we adopted a chemical-screening strategy and manufactured tubular heaters using the electrically, chemically, and mechanically optimized Sr-Cu codoped La_0.9Sr_0.1Cr_0.8Cu_0.2O_3-δ (LSCCuO-9182). HPHT examinations of cylindrical LSCCuO-9182 heaters on Walker-type multianvil apparatuses demonstrated a small temperature gradient, robust thermochemical stability, and excellent compatibility with high-pressure assemblies below 2273 K and 10 GPa. Thermochemical mechanism analysis revealed that the temperature limitation of the LSCCuO-9182 heater was related to the autoredox process of the Cu dopant and Cr and the exchanging ionic migration of Cu and Mg between the LSCCuO-9182 heater and the MgO sleeve. Our combinatorial strategy coupled with thermochemical mechanism analysis makes the prioritization of contradictory objectives more rational, yields reliable LCO heaters, and sheds light on further improvement of the temperature limitation and thermochemical stability.

Keywords: LaCrO3 ceramic heater; high-pressure and high-temperature synthesis; high-pressure cell compatibility; temperature field; thermochemical mechanism.