Synthesis of new environment-friendly yellow pigments

Furukawa, Shinya; Masui, Toshiyuki; Imanaka, Nobuhito

doi:10.1016/j.jallcom.2005.08.108

Cited by 63 publications

(16 citation statements)

References 8 publications

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“…The part which has extended delocalized system of electrons called a chromophore. A sequence of alternating double bonds through which the electrons are spread is termed a conjugated system [6][7][8]. Group of atoms which can modify the colour are called auxochromes.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Orange Pigments from Rare Earth Metal Ions

Rao¹,

Divya²

2017

Asian J. Chem.

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New inorganic pigments were synthesized through calcination route with advantages such as the ability to prepare homogeneous oxides of lower size, which could provide for higher surface coverage. The synthesized inorganic pigments were characterized by various techniques like infrared, UV-visible spectroscopy and diffuse reflectance spectroscopy (DRS) using CIE -L*a*b* parameters method for colour measurements. The above characterized inorganic pigments were used for the study of the pigments of associated ions. Solid state reactions of these metal ions with transition metal ions like chromium, molybdenum, manganese and iron were carried out individually. A replacement for cadmium, cobalt, lead and mercury based pigments has been sought through the use of rare earth metal ions -cerium and lanthanum. It was found that cerium offered better scope for doping than lanthanum as it produced better shades. Multiple doping plays a vital role in increasing the mass tone and tint strength.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Orange Pigments from Rare Earth Metal Ions

Rao¹,

Divya²

2017

Asian J. Chem.

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“…CeO 2 and WO 3 oxides, mixed and annealed under vacuum, thus under reducing atmosphere, led to Ce 10 W 22 O 81 (Barker & Radosavljevic Evans, 2008). Up to now no attempt has been made to obtain rare earth tungstates at a submicronic or nanometer scale, except the work of Furukawa et al (2006) on amorphous cerium tungstate powders with grain sizes around 15 nm. On the other hand, tungsten alloys are already available at a nanometer scale (Naik et al, 2011;Koseva et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Monoclinic superstructure in orthorhombic Ce₁₀W₂₂O₈₁from transmission electron microscopy

Patout

Jacob

Arab

et al. 2014

Acta Crystallogr Sect B

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Synopsis -A monoclinic superstructure occurring in a Ce 10 W 22 O 81 compound was identified by transmission electron microscopy. The partial oxidation of Ce 3+ along with interstitial oxygen ions could explain this superstructure.Abstract -A complex rare earth tungstate structure, present in a two-phased powder, was solved by electron diffraction, precession and high resolution electron microscopy. The orthorhombic space group Pbnm and the atomic positions deduced from X-rays diffraction experiments were confirmed for Ce 10 W 22 O 81 . A C2/c monoclinic superstructure, with cell parameters a = 7.8 Å, b = 36.1 Å, c = 22.2 Å and β = 100.2°, was evidenced and attributed to a partial oxidation of Ce 3+ leading to interstitial oxygen ions.

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“…Although chrome yellow (PbCrO 4 ), cadmium yellow (CdS), and cadmium red (CdS/CdSe) have been widely used as conventional inorganic pigments, the use of these pigments have been restricted because they contain toxic elements such as Cd, Cr, Pb, or Se, which are harmful not only to our health but also to the environment. Some new safe inorganic pigments based on metal oxides and compounds have been synthesized by several researchers in order to replace the toxic inorganic pigments with the environmentfriendly pigments or less-toxic substances [2][3][4][5][6][7][8][9][10][11]. Although praseodymium yellow (ZrSiO 4 :Pr) [2] has been known as one of the environment-friendly inorganic yellow pigments for ceramics, this pigment is synthesized at elevated temperatures (above 1273 K), which tends to induce particle growth of the pigments.…”

Section: Introductionmentioning

confidence: 99%