Comment on "High-pressure x-ray diffraction study of YBO3/Eu3+, GdBO3, and EuBO3: Pressure-induced amorphization in GdBO3" [J. Appl. Phys. 115, 043507 (2014)]

被引：138

作者：

Errandonea, D. ^{[1
]}

Munoz, A. ^{[2
]}

Gonzalez-Platas, J. ^{[3
]}

机构：

[1] Univ Valencia, Dept Fis Aplicada ICMUV, MALTA Consolider Team, E-46100 Valencia, Spain

[2] Univ La Laguna, Dept Fis, Inst Mat & Nanotecnol, MALTA Consolider Team, E-38205 Tenerife, Spain

[3] Univ La Laguna, Dept Fis, Serv Difracc Rayos X, E-38206 Tenerife, Spain

来源：

JOURNAL OF APPLIED PHYSICS | 2014年 / 115卷 / 21期

关键词：

SIMULATIONS; CALCITE; STATE;

D O I：

10.1063/1.4881057

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

High-pressure x-ray diffraction studies on vaterite-type borates were reported on the above paper and their room-temperature P-V equation of state (EOS) determined. YBO3/Eu3+ and GdBO3 were found to have bulk moduli around 320 GPa, 90% larger than the bulk modulus obtained for EuBO3. Consequently, it was stated that vaterite-type borates are as incompressible as cubic BN. Such a different compressional behavior of isomorphic borates contradicts the known systematic of related borates. Here, we show that the conclusions reported on the above article could be hindered by experimental errors and artifacts. Ab initio calculations support our criticism giving similar bulk moduli (130-141 GPa) in the three compounds. Based upon these arguments, we conclude that the high-pressure behavior of vaterite-type borates should be revised using accurate experimental techniques. Finally, a methodological critic on EOS fits and to structural refinements is also presented. (C) 2014 AIP Publishing LLC.

引用

页数：3

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