Solubility and aging of lead magnesium niobate in water

Şakar‐Deliormanlı, Aylin; Çelik, Erdal; Polat, Mehmet

doi:10.1016/j.ceramint.2008.01.003

Cited by 13 publications

(12 citation statements)

References 16 publications

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“…Although the rise in viscosity may be attributed to the complex formation between the divalent ions and the PAA there is also a possibility for a complex formation between MgCl 2 and PMN particle surface. According to the previous study of Deliormanli et al electrophoretic mobility measurements of the PMN suspensions showed that in the presence of MgCl 2 , as a background electrolyte, isoelectric point of PMN was depended on the salt concentration which means that there is Mg 2+ adsorption onto the surface [39]. Similar results were obtained for PAA-coated PMN suspensions containing zinc acetate.…”

Section: Gelation With Ionic Strength Modificationsupporting

confidence: 75%

“…The solubility of these cations from the surface reaches maximum especially at pH < 3. On the other hand, Nb 5+ have a rather low dissolution under the same conditions [39]. Furthermore, during acid titration the reactivity of PMN particles may lead to a time dependent pH rise and this cause partial restabilization of the PMN suspensions.…”

Section: Gelation With Ph Modificationmentioning

confidence: 99%

“…Ion bridging interactions may cause rapid aggregation of PAA molecules and PAA stabilized particles [30]. Detailed discussion on the effect of dissolved cations on the stability of PMN particles can be found elsewhere [31,39].…”

Section: Effect Of Paa On the Dispersion Behavior Of Pmn Suspensionsmentioning

confidence: 99%

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Rheological behavior of PMN gels for solid freeform fabrication

Şakar‐Deliormanlı¹,

Çelik²,

Polat³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tLead magnesium niobate (PMN) is a relaxor ferroelectric material and have widespread applications in the manufacture of multilayer electronic devices such as ceramic capacitors, actuators and transducers. The dielectric constant of this electrostrictive material is much higher than the well known ferroelectric barium titanate. However, aqueous processing of PMN is not investigated yet especially for the novel wet shaping fabrication. In this study, concentrated aqueous colloidal PMN gels have been designed to use in the robocasting process. Concentrated PMN suspensions were stabilized by polyacrylic acid and then gelation induced by changing the pH or ionic strength of the suspension or by addition of a cationic polyelectrolyte to the system. Through this procedure it was essential to understand the solid-liquid transition under shear to explore the feasibility of forming without excessive use of polymers. Therefore, rheological response of the samples having a gel network was investigated. Results showed that gelation induced by cationic polyethylene imine or by multivalent salts were successful methods in preparation of PMN gels. However, gelation induced by changing the pH of the suspension was challenging due to ion dissolution from PMN surface.

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Section: Gelation With Ionic Strength Modificationsupporting

confidence: 75%

Section: Gelation With Ph Modificationmentioning

confidence: 99%

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Rheological behavior of PMN gels for solid freeform fabrication

Şakar‐Deliormanlı¹,

Çelik²,

Polat³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Figure 7a, b shows the FTIR spectra of the LPMO powders in the range of 600-4,000 cm -1 , fresh xerogels and calcined at 650°C, respectively. The FTIR spectrum is similar to the most other ABO 3 -type perovskite compounds which have common BO 6 oxygenoctahedral structure [22][23][24]. Two samples show the typical M-O-C pair vibrations around 1,385 and 1,593 cm -1 [25].…”

Section: Ir Spectramentioning

confidence: 55%

Fabrication of perovskite-type oxide La0.5Pb0.5MnO3 nanoparticles and its dye removal performance

Tavakkoli

Moayedipour

2014

J Nanostruct Chem

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La 0.5 Pb 0.5 MnO 3 perovskite-type oxide is prepared by sol-gel method. The physical and chemical properties of a nanoparticle were characterized by differential thermal analysis (DTA), thermogravimetric analysis, XRD, and scanning electron microscopy (SEM) techniques. The adsorption effect of the sample is evaluated by removal of Eosin dye from aqueous solution. The results of XRD indicate that the perovskite-type oxide has a good crystal phase at 650°C. The DTA, XRD, and SEM data revealed that La 0.5 Pb 0.5 MnO 3 nano particles are prepared successfully via sol-gel modified pechini method. These nanoparticles showed the excellent adsorption efficiency towards Eosin dye in aqueous solution. The adsorption studies were carried out at different pH values, dye concentrations, various adsorbent dosages, and contact time in a batch experiment. The dye removal efficiency was found to be decreased with increasing in initial pH of the dye solution, and nanoadsorbent exhibited good dye removal efficiency at acidic pH specially pH 1. Experimental results indicated that the adsorption kinetic data follow a pseudofirst-order rate for tested dye. The isotherm evaluations revealed that the Freundlich model attained better fits to the experimental equilibrium data than the Langmuir and Temkin models.

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“…Another explanation for the decrease observed in lead amount may due to the complex formation such as PbOH or Pb 4 ðOHÞ 4 4 . [29] Figures 8 and 9 demonstrate the effect of PAA=PEO comb polymers and PAA on the solubility of PMN as a ion concentration in solution at pH 6 and pH 9. Furthermore, an increase was observed in Pb þ2 and Mg þ2 concentrations in solution as the polyelectrolyte concentration increase.…”

Section: Cation Dissolution From Pmn In the Presence Ofmentioning

confidence: 99%

Influence of Dispersing Agents on the Solubility of Perovskites in Water

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of Dispersion Science and Technology

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In this study, solubility behavior of lead magnesium niobate (PMN) powders in water was investigated in the presence of pure polyacrylic acid and polyacrylic acid/polyethylene oxide comb polymers. Experiments were performed by measuring the solubility of PMN in terms of the concentration of Pb þ2 and Mg þ2 ions in supernatant as a function of pH and dispersing agent dosage. The concentrations of the metal ions in supernatant were found to be affected by the dispersant concentration, stirring time and the suspension pH. Results revealed that both dispersing agents enhance the cation dissolution from PMN surface at pH 9 due to weak (reversible) adsorption and complexation of Pb þ2 and Mg þ2 by carboxylate groups. On the other hand, under acidic conditions cation dissolution from PMN is inhibited and this was attributed to the strong adsorption of dispersing agents onto the powder surface and formation of a dense polymer layer.

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Solubility and aging of lead magnesium niobate in water

Cited by 13 publications

References 16 publications

Rheological behavior of PMN gels for solid freeform fabrication

Rheological behavior of PMN gels for solid freeform fabrication

Fabrication of perovskite-type oxide La0.5Pb0.5MnO3 nanoparticles and its dye removal performance

Influence of Dispersing Agents on the Solubility of Perovskites in Water

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