Prospects for light-rare-earth-based permanent magnet compound R2Fe14B (R=La1−xCex with 0≤x≤1) are inspected from first principles referring to the latest experimental data. Ce-rich 2:14:1 compounds come with good structure stability, reasonably good combination of magnetization and magnetic anisotropy, while a drawback lies in the low Curie temperature that is only 120~K above the room temperature at the Ce2Fe14B limit. Best compromise is inspected on the basis of ab initio data for (La1−xCex)2Fe14B referring to the magnetic properties of the champion magnet compound Nd2Fe14B and prerequisite conditions imposed by practical utility.
@article{arxiv.1901.10119,
title = {Optimal uni-axial ferromagnetism in (La,Ce)$_2$Fe$_{14}$B for permanent magnets},
author = {Munehisa Matsumoto and Masaaki Ito and Noritsugu Sakuma and Masao Yano and Tetsuya Shoji and Hisazumi Akai},
journal= {arXiv preprint arXiv:1901.10119},
year = {2019}
}