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Role of crystallographic texture and crystallinity on the electrochemical behavior of nanocrystalline Sr doped calcium phosphate coatings
Balakrishnan Munirathinam,
Published in Electrochemical Society Inc.
2016
Volume: 163
   
Issue: 7
Pages: D336 - D343
Abstract
In order to decipher the effect of crystallite size and crystallographic texture on the electrochemical properties of strontium doped calcium phosphate (CaP) coatings, electrodeposition was carried out on two different substrates (Ti and NiTi) and at two different current densities (−1.5 and −3.5 mA cm−2). X-ray diffraction (XRD) studies confirmed the presence of brushite and hydroxyapatite (HaP) phases in varying weight fraction as an effect of varying current densities. XRD line profile analyses showed crystallite size of both CaP phases decrease with increase in current density. X-ray pole figures revealed preferential orientation (texture) of HaP crystallites in [0001] direction and it is pronounced at higher current density for both substrates. Surface characterization and phase analysis were carried using scanning electron microscopy and transmission electron microscopy (TEM). TEM results corroborate the local texture of HaP crystallites, where arc diffraction pattern of (0002) facet was observed. Polarization studies revealed that coating synthesized at higher current density on NiTi having high degree of texture showed icorr of 10−8 A cm−2, which is one order less than that of values obtained for other coatings (10−7 A cm−2). Electrochemical impedance spectroscopy studies exhibited two relaxation features, suggesting the formation of inner barrier and outer porous layer. © The Electrochemical Society
About the journal
JournalJournal of the Electrochemical Society
PublisherElectrochemical Society Inc.
ISSN00134651
Open AccessNo
Concepts (23)
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    Binary alloys
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    Calcium phosphate
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    Crystallinity
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    Crystallite size
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    Current density
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    Electrochemical impedance spectroscopy
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    High resolution transmission electron microscopy
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    Hydroxyapatite
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    Nanocrystals
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    Scanning electron microscopy
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    Strontium compounds
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    Textures
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    Titanium alloys
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    X ray diffraction
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    Crystallographic textures
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    Different substrates
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    DOPED CALCIUM PHOSPHATES
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    Electrochemical behaviors
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    HYDROXYAPATITE (HAP)
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    Line profile analysis
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    Preferential orientation
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    Surface characterization
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    Phosphate coatings