Boron-doped diamond as a new heating element for internal-resistive heated diamond-anvil cell

ABSTRACT

We have developed an internal-resistive heated diamond-anvil cell (IHDAC) with a new resistance heater – boron-doped diamond (BDD) – along with an optimized design of the cell assembly, including a composite gasket. Our proposed technique is capable of heating a silicate/oxide material with (1) long-term stability (>1 h at 2500 K) and (2) uniform radial temperature distribution (±35 K at 2500 K across a 40-µm area), which are clear advantages over the conventional laser-heated and internal-heated DACs. In addition, the achieved temperature in this study was greater than 3500 K, which mostly covers the possible geotherm of the entire lower mantle. In situ X-ray diffraction (XRD) measurement and ex situ chemical analyses confirmed that weak XRD intensity from the BDD heater and chemical inertness (no boron diffusion into silicate samples). This newly developed IHDAC with a BDD heater can be used to determine the phase diagrams of mantle materials with high precision and be used in lower-mantle petrology.

KEYWORDS:

• Internal-resistive heated diamond-anvil cell
• boron-doped diamond
• lower mantle

Acknowledgements

The authors thank S. Ohnishi for providing the glass starting material. H. Gomi and T. Yagi are acknowledged for their technical advice. The anonymous reviewer is also acknowledged for helpful comments that improved the manuscript. The synchrotron X-ray diffraction measurements were conducted at BL10XU of SPring-8 (proposal No. 2016A1228 and 2016A1411).

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by JSPS KAKENHI Grant Number JP15H05831 to ST from the Japan Society for the Promotion of Science.