Abstract
Single crystals of Nd 9.33(SiO 4) 6O 2 and Sr 2Nd 8(SiO 4) 6O 2 oxide ion conductors with the oxyapatite structure were grown without any macroscopic defect by the floating zone method. The oxide ion conductivity of the Sr 2Nd 8(SiO 4) 6O 2 single crystal varied with the distance from its seed crystal along the growth direction, because of its changing deficiency in Sr content. Its stoichiometric portion had a lower electrical conductivity by about five orders of magnitude at 600 °C than the value for Nd 9.33(SiO 4) 6O 2 single crystal. Structural refinement of neutron diffraction data for powdered Nd 9.33(SiO 4) 6O 2 single crystal showed that the previous structure analysis was misleading. Cation vacancies were present only at 4f site and its channel oxygen site was fully occupied in space group of P6 3/ m. The oxygen had an anisotropic displacement along the channel in the refined oxyapatite structure.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
