Magnetic properties of crystalline diamond powders synthesized at high pressure and high temperature in the graphite-nickel-aluminum system

被引：0

作者：

Shakhov, Fedor M. ^{[1
]}

Oshima, Ryuji ^{[2
,3
]}

Popov, Valery V. ^{[1
]}

机构：

[1] Ioffe Inst, 26 Politekhnicheskaya Str, St Petersburg 194021, Russia

[2] Nippon Inst Technol, 4-1 Gakuendai, Saitama 3450826, Japan

[3] DISCO Corp, 2-13-11 Omorikita, Tokyo 1438580, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2024年 / 185卷

关键词：

Diamonds; High pressure; Nickel impurity; Magnetization; Superparamagnetic nanoparticles; TRANSITION; EPR;

D O I：

10.1016/j.jpcs.2023.111770

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

This work continues the study of two crystalline diamond powders with a size of 63-100 mu m, rapidly synthesized at a high pressure of 5 GPa and a high temperature of 1650 degrees C from a mixture of graphite and nickel powders with aluminum addition (9 wt %). Magnetization measurements performed with these samples in the temperature range of 4.5-300 K and a magnetic field of 0-100 kOe revealed the presence of nickel in the form of superparamagnetic nanoparticles with a size of 7.5 nm. The addition of aluminum to the growth medium reduces not only the content of nitrogen impurities in diamond crystals but also the nickel content (from 1760 to 270 ppm). The presence of size 7-15 nm nickel nanoparticles was also confirmed by powder X-ray diffraction.

引用

页数：6

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