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Electric Field‐Enhanced Solid‐State Conversion of Ceramic Sr 5 (PO 4 ) 3 F to Crystals
Author(s) -
Liu Yin,
Wu Yiquan
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14396
Subject(s) - materials science , grain boundary , spark plasma sintering , fluorapatite , electric field , space charge , crystallite , isothermal process , sintering , grain growth , impurity , annealing (glass) , analytical chemistry (journal) , charge carrier , mineralogy , grain size , chemistry , metallurgy , electron , thermodynamics , optoelectronics , microstructure , physics , organic chemistry , chromatography , quantum mechanics , apatite
The single crystal solid‐state conversion of fluorapatite‐type Sr 5 ( PO 4 ) 3 F (Sr‐ FAP ) has been achieved by spark plasma sintering with the assistance of NaF additive. NaF was determined to act as both a sintering aid and impurity solute along the grain boundaries ( GB s), controlling both the space charge and GB migration rate. Postsintering isothermal annealing was performed to examine the effect of DC electric field on grain growth. From the space charge potential determined from impedance spectra measurements, in combination with the theoretical contribution of space charge to grain‐boundary energy reduction, it was concluded that the magnitude of the space charge in Sr‐ FAP is temperature dependent. As such, a moderate decrease in polycrystalline GB driving force is the main cause for the increased single crystal migration length that was observed in this study.