TY - JOUR

T1 - EPR of synthetic diamond heavily doped with phosphorus

AU - Nadolinny, Vladimir

AU - Komarovskikh, Andrey

AU - Palyanov, Yuri

AU - Sokol, Alexander

PY - 2015

Y1 - 2015

N2 - In this work, diamond synthesized under high-pressure high-temperature (HPHT) conditions in the phosphorus-carbon system with addition of aluminum has been studied by electron paramagnetic resonance (EPR). It is established that microcrystals with different defect concentrations are formed. Nitrogen-phosphorus defects NP3 are observed in some microcrystals, although pure phosphorus paramagnetic centers NP8 and NP9 are detected in other microcrystals. The NP8 center has an electron spin S = 1/2, gxx = gyy = 2.0016, gzz = 2.0048, and hyperfine structure (HFS) of one phosphorus atom Axx = Ayy = 3.2 mT, Azz = 5.6 mT. The NP9 center has an electron spin S = 1/2, gxx = gyy = 2.0038, gzz = 2.0030, and HFS of two inequivalent phosphorus atoms A(P1)xx = A(P1)yy = 8.8 mT, A(P1)zz = 13.6 mT, A(P2)xx = A(P2)yy = 2.2 mT, A(P2)zz = 1.4 mT. The structures of the NP8 and NP9 centers are discussed. Concentration of phosphorus impurity in some microcrystals is high enough to detect conductivity electrons. Subsequent annealing of the samples at 2273 K leads to the disappearance of the NP3, NP8, and NP9 spectra; the NP4 spectrum is observed.

AB - In this work, diamond synthesized under high-pressure high-temperature (HPHT) conditions in the phosphorus-carbon system with addition of aluminum has been studied by electron paramagnetic resonance (EPR). It is established that microcrystals with different defect concentrations are formed. Nitrogen-phosphorus defects NP3 are observed in some microcrystals, although pure phosphorus paramagnetic centers NP8 and NP9 are detected in other microcrystals. The NP8 center has an electron spin S = 1/2, gxx = gyy = 2.0016, gzz = 2.0048, and hyperfine structure (HFS) of one phosphorus atom Axx = Ayy = 3.2 mT, Azz = 5.6 mT. The NP9 center has an electron spin S = 1/2, gxx = gyy = 2.0038, gzz = 2.0030, and HFS of two inequivalent phosphorus atoms A(P1)xx = A(P1)yy = 8.8 mT, A(P1)zz = 13.6 mT, A(P2)xx = A(P2)yy = 2.2 mT, A(P2)zz = 1.4 mT. The structures of the NP8 and NP9 centers are discussed. Concentration of phosphorus impurity in some microcrystals is high enough to detect conductivity electrons. Subsequent annealing of the samples at 2273 K leads to the disappearance of the NP3, NP8, and NP9 spectra; the NP4 spectrum is observed.

KW - defects

KW - diamond

KW - electron paramagnetic resonance

KW - phosphorus

UR - http://www.scopus.com/inward/record.url?scp=84937468486&partnerID=8YFLogxK

U2 - 10.1002/pssa.201532166

DO - 10.1002/pssa.201532166

M3 - Article

AN - SCOPUS:84937468486

VL - 212

SP - 2568

EP - 2571

JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

SN - 1862-6300

IS - 11

ER -