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- W2048991653 abstract "Abstract The kinetics of crystal growth of the lead fluoride phases was studied at 25°C using the so-called constant composition method (pF-stat method). A linear growth law was obeyed for αPbF 2 growth from equivalent lead nitrate and potassium fluoride solutions with low supersaturation and pH between 5.2 and 5.6 in pure water and in 0.1 mol dm −3 KNO 3 solution. The rate is about 5 times greater at high ionic strength. It decreases linearly with changing pH of the supersaturated solution both to higher and to lower values than mentioned (addition of KOH and HNO 3 , respectively), i.e. reaching the pH's at which two other lead fluoride phases grow: (a) with large excess of Pb(NO 3 ) 2 over KF and KOH to pH = 5.2 phase(s) of so far unresolved structure, which undergoes the recrystallization in water to pure αPbF 2 , and after annealing to 450°C decomposes into β-PbF 2 , and an unidentified phase (probably α(K N Pb N−1 )F 2−N phase with N varied); (b) with large excess of KF over Pb(NO 3 ) 2 and HNO 3 to pH = 4.3, the βPbF 2 phase was identified. The characterization of the grown phases was done on the basis of polarizing microscopy, Fourier transform infrared (FTIR) spectra and X-ray powder diffraction analysis." @default.
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- W2048991653 date "1993-05-01" @default.
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- W2048991653 title "Crystal growth of lead fluoride phases using the constant composition method III. Effect of pH and ionic strength" @default.
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- W2048991653 doi "https://doi.org/10.1016/0022-0248(93)90865-t" @default.
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