An EPR study of W5+ in a recently discovered triclinic tungsten bronze, Na0.33WO3

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Abstract
A single crystal EPR study of W5+ in triclinic Na0.33WO3, a recently discovered compound, has been carried out at about 15 K and 9.2 MHz. The EPR spectrum consists of two strong resonances and several weaker resonances whose relative intensities are sample‐dependent. The total W5+ concentration is approximately 1000 at. ppm. The principal g‐tensor components and the 183W hyperfine splitting constants for the two strong resonances are |g1|=1.695±0.003, |g2|=1.659±0.003, |g3|=1.636±0.003 [|A2|≃(61±8)×10−4 cm−1] and |g1|=1.676±0.002, |g2|=1.630±0.002, |g3|=1.593±0.002 [|A3|≃(52±4)×10−4 cm−1] for resonance 1 and resonance 2, respectively. The hyperfine splitting constants could only be determined in a few orientations because of either lack of resolution or interference of weaker resonances. It is proposed that the observed resonances are due to different W5+ point defects in the Na0.33WO3 host. This work represents the first evidence of W5+ in the tungsten bronzes.

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