A high-pressure cell for electrical resistance measurements at hydrostatic pressures up to 8 GPa: Results for Bi, Ba, Ni, and Si

A high-pressure cell for electrical resistance measurements at hydrostatic pressures up to 8 GPa : Results for Bi, Ba, Ni, and Si

A modified Bridgman anvil high-pressure device, capable of producing hydrostatic pressures up to 8 GPa (80 kbar), was designed and built. The size of the pressure chamber (10 mm in diameter) allows the use of large specimens and simple experimental procedures. Experimental results show that hydrostatic conditions are necessary if accurate quantitative information is desired about the electrical properties of materials under pressure. Accurate data on resistance (and resistivity) versus pressure at 294 K are given for Bi, Ba, Ni, and Si. The initial pressure coefficients of R were d(ln R)dP=0.13, −7.6×10−2, −2.0×10−2, and −0.26 GPa−1, respectively. Barium has a resistance minimum near 0.9 GPa. For Bi we observe sharp transitions at 2.55, 2.7, and 7.7 GPa, and for Ba at 5.55 GPa, but we cannot verify the existence of a transition in Ba near 7 GPa. Neither do we confirm the phase transformation in Ni recently reported to occur above 2.5 GPa. For Si, R(P) agrees very well with a theoretical function calculated from the change in band gap and electron mobility with pressure.

Sundqvist, BertilUmeå universitet,Institutionen för fysik(Swepub:umu)besu0001 (författare)
Bäckström, GunnarUmeå universitet,Institutionen för fysik(Swepub:umu)guba0007 (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Ingår i:Journal of Applied Physics: AIP Publishing65:10, s. 3943-39500021-89791089-7550

Av författaren/redakt...: Andersson, Göran; Sundqvist, Berti ...; Bäckström, Gunna ...

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