1988
DOI: 10.1016/0254-0584(88)90054-5
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Anisotropy in the electrical properties of zirconium doped α -Fe2O3 single crystals

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Cited by 4 publications
(4 citation statements)
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“…The interpretation of hematite transport data is often confounded by polycrystalline or impure natural and synthetic samples. 57,58 Of most importance, in our view, is the accurate determination of the sample composition regarding impurities or vacancies that may affect electronic properties. Further, measurements are commonly made at elevated temperatures due to the high resistivity of the material.…”
Section: The Journal Of Physical Chemistry Lettersmentioning
confidence: 99%
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“…The interpretation of hematite transport data is often confounded by polycrystalline or impure natural and synthetic samples. 57,58 Of most importance, in our view, is the accurate determination of the sample composition regarding impurities or vacancies that may affect electronic properties. Further, measurements are commonly made at elevated temperatures due to the high resistivity of the material.…”
Section: The Journal Of Physical Chemistry Lettersmentioning
confidence: 99%
“…At ambient conditions, hematite is a canted antiferromagnet that crystallizes in a distorted hexagonal structure ( R 3̅ c space group, a = 5.035 Å, c = 13.75 Å), with basal planes of Fe atoms separated by hexagonal close-packed oxygen layers. The interpretation of hematite transport data is often confounded by polycrystalline or impure natural and synthetic samples. , Of most importance, in our view, is the accurate determination of the sample composition regarding impurities or vacancies that may affect electronic properties. Further, measurements are commonly made at elevated temperatures due to the high resistivity of the material. , …”
mentioning
confidence: 99%
“…The ionic radii of Ti 4+ (60 pm) and Cr 3+ (61 pm) are similar, leading to a negligible change in the lattice for this substitution [54]. A similar phenomenon can be observed for Zr + etching, where a Zr 4+ ion could substitute for a Fe 3+ ion present in a crystalline lattice, e.g., Fe 2 O 3 [55,56].…”
Section: Structural and Chemical Analyses Of Etched Couponsmentioning
confidence: 59%
“…Hematite has had limited success as a PEC material for several reasons, however. As a pure-phase material, it is a known Mottinsulator, which means that, though charge separation occurs, charge transport properties are poor [68,75,81]; typically synthesized as low quality polycrystalline films, it exhibits high recombination rates due to crystal grain boundaries and unordered oxygen vacancies [86]; it exhibits anisotropic conductivity, wherein conductivity along the (001) plane is four orders of magnitude higher than in the [001] direction [45,55,81], which is again an issue for polycrystalline films; and the conduction band edge is typically ~0.2 eV too positive for unbiased hydrogen evolution [87]. Group IV and III-V: There are many possible binary, ternary, and quaternary combinations of group III-V and IV elements that yield semiconductors with interesting…”
Section: Types Of Pec Cells/materials and Background Literaturementioning
confidence: 99%