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By Radu Robert Piticescu; Witold Łojkowski; John R Blizzard

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Diffraction contrast variation across the particles caused by high strains within the particles is clearly observed. The high strains obviously stem from structural defects formed during hydrothermal synthesis, presumable in the form of lattice OH− ions and their compensation by cation vacancies. HRTEM images demonstrate that surface facets parallel to the (100) and (110) planes and small islands with 3 ~ 4 atomic layer thickness are frequently observed around the edge of the particles. Introduction Barium titanate (BT) has good dielectric and ferroelectric properties, and is widely used in thermistors, multilayer ceramic capacitors (MLCs), and electro-optic devices.

1 J/cm2 for the unfocused beams at 532 nm, 266 nm and 400 nm, respectively. The irradiated colloidal solutions were stable and free from any precipitates for at least some months. The properties of the nanoparticles and their changes after the laser irradiation were studied by optical absorption spectroscopy because as discussed [8,9] the position and shape of the plasmon absorption are sensitive to the particle size. The optical absorption spectra of silver colloids were recorded with a Carry-500 spectrometer in a 1 cm path length quartz cuvette.

Commercial HAp time 4 hours-P1HPA10 time 3 hours-P1HPA9 time 2 hours-P1HPA8 0 10 20 30 40 50 2θ 60 70 0 80 10 20 30 40 50 60 70 2θ a) b) Figure 1. 810 Int. 637 100 59 29 100 80 70 30 100 78 68 10 100 74 46 20 100 70 61 30 100 73 64 28 100 66 74 23 d (Å) Phase Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Ca5(PO4)3(OH) – hydroxylapatite Table 2.

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