Synthesis, bulk, and surface characterization of niobium-doped Fe/sub 2/O/sub 3/ single crystals

Journal Article · Wed Jan 01 04:00:00 EST 1986 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(86)90005-8· OSTI ID:5957650

Sanchez, C; Hendewerk, M; Sieber, K D; Somorjai, G A

Single crystals of niobium-substituted ..cap alpha..-Fe/sub 2/O/sub 3/ were grown by using chemical vapor transport with tellurium tetrachloride and were characterized by using bulk methods (X rays, resistivity, magnetism) and surface techniques (low-energy electron diffraction (LEED), Auger, X-ray photoelectron spectroscopy (XPS)). Niobium-substituted ..cap alpha..-Fe/sub 2/O/sub 3/ crystallizes with the corundum structure, and is an extrinsic n-type semiconductor with a room temperature resistivity of approximately 85 Omega cm, and an activation energy for conductivity of 0.22 eV. Low-temperature susceptibility measurements suggest that the substitution of niobium(V) in octahedral sites leads to reduction of iron(III) to iron(II) without spinel phase inclusions. The main face of the single crystal platelets is the (001) basal plane of ..cap alpha..-Fe/sub 2/O/sub 3/. The surface is very well ordered as shown by LEED. These crystals show good potential for application in both photoelectrochemistry and surface science studies. 23 references, 5 figures.

• Research Organization: Univ. of California, Berkeley
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5957650
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 61:1; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACTIVATION ENERGY
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COHERENT SCATTERING
CRYSTAL DOPING
CRYSTAL GROWTH
CRYSTAL STRUCTURE
CRYSTALS
DATA
DEPOSITION
DIFFRACTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
EXPERIMENTAL DATA
INFORMATION
IRON COMPOUNDS
IRON OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATERIALS
MEDIUM TEMPERATURE
METALS
MONOCRYSTALS
N-TYPE CONDUCTORS
NIOBIUM
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
SCATTERING
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
SURFACE COATING
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION