Results 1 to 10 of about 4,938 (215)

The blue road: Provenance study of azurite samples from historical locations through the analysis of minor and trace elements [PDF]

Heliyon, 2023
The pigments used by artists since ancient times play an important role in historical, artistic, and cultural investigations. They allow the acquisition of useful information for the study of human and technological development.
Laura Medeghini, Silvano Mignardi, Maurizio Petrelli   +2 more
exaly   +4 more sources

Ammonium–Amine Co-Activation: Promoting the Sulfurization of Azurite and Its Effect on Xanthate Adsorption [PDF]

Molecules, 2023
Enhanced sulfurization has always been the focus of research on the flotation of copper oxide minerals. In this study, combined ammonium–amine salts were innovatively applied to improve the sulfurization of azurite.
Chao Su, Dianwen Liu, Jinpeng Cai, Peilun Shen   +3 more
doaj   +2 more sources

Semiquantitative theory for high-field low-temperature properties of a distorted diamond spin chain [PDF]

Condensed Matter Physics, 2012
We consider the antiferromagnetic Heisenberg model on a distorted diamond chain and use the localized-magnon picture adapted to a distorted geometry to discuss some of its high-field low-temperature properties.
O. Derzhko, J. Richter, O. Krupnitska
doaj   +5 more sources

Biodeterioration effects of three Aspergillus species on stucco supported on a wooden panel modeled from Sultan al-Ashraf Qaytbay Mausoleum, Egypt [PDF]

Scientific Reports, 2023
This study focuses on the magnificent decoration of a painted and gilded wooden panel with signs of fungal biodeterioration caused by Aspergillus species in the Mausoleum of Sultan al-Ashraf Qaytbay, Cairo, Egypt.
Hala A. M. Afifi, Maisa M. A. Mansour, Alyaa G. A. I. Hassan, Mohamed Z. M. Salem   +3 more
doaj   +2 more sources

Growth of covellite crystal onto azurite surface during sulfurization and its response to flotation behavior

International Journal of Mining Science and Technology, 2021
In this work, the growth of copper sulfide crystal onto azurite surfaces during sulfurization and its response to flotation are investigated. Filed emission scanning electron microscopy-energy dispersive X-ray spectroscopy (FESEM) and X-ray diffraction ...
Peilun Shen
exaly   +3 more sources

Multi-Analytical and Non-Invasive Approach for Characterising Blackened Areas of Originally Blue Paints [PDF]

Molecules
Azurite, a natural mineral pigment consisting of basic copper carbonate (2CuCO3·Cu(OH)2), is one of the Middle Ages’ most common blue pigments. Why paintings originally coated with azurite appear blackened today remains debated.
Maria Labate, Maurizio Aceto, Giacomo Chiari, Simone Baiocco, Lorenza Operti, Angelo Agostino   +5 more
doaj   +2 more sources

Thermal stability of azurite and malachite in relation to the formation of mediaeval glass and glazes [PDF]

Thermochimica Acta, 2002
Azurite and malachite have been extensively used as pigments in ancient and medieval manuscripts, glasses and glazes. The thermal stability of naturally occurring azurite and malachite was determined using a combination of controlled rate thermal ...
Jacob Teunis Kloprogge, Wayde Martens
exaly   +3 more sources

Critical Phenomena at the Antiferromagnetic Phase Transition of Azurite [PDF]

Journal of the Korean Physical Society, 2012
We report on high-resolution acoustic, specific-heat and thermal expansion measurements in the vicinity of the antiferromagnetic phase transition at T_N = 1.88 K on a high-quality single crystal of the natural mineral azurite. A detailed investigation of
A Kornblit, A Pelissetto, A. Brühl, B Lüthi, B Lüthi, B. Wolf, H Forstat, H Jeschke, H Kikuchi, H S Bennett, H S Bennett, K C Rule, L P Kadanoff, M C R Gibson, M. Lang, P. T. Cong, R J Pollina, R Pott, R. S. Manna, S. Köhler, Sullivan, T Nattermann   +21 more
core   +2 more sources

Dynamic and thermodynamic properties of the generalised diamond chain model for azurite [PDF]

Journal of Physics: Condensed Matter, 2011
The natural mineral azurite Cu3(CO3)2(OH)2 is an interesting spin-1/2 quantum antiferromagnet. Recently, a generalised diamond chain model has been established as a good description of the magnetic properties of azurite with parameters placing it in a ...
Aimo F Krämer S Klanjšek Horvatić M Berthier C, Andreas Honecker, Bursill R J, Caux J-S, Gibson M C R, Honecker A, Honecker A, Jeschke H, Johannes Richter, Kang J, Levy F, Manmana S R Picon J-P Schmidt K P Mila F, Miyahara S, Okamoto K, Okamoto K, Radu T, Richter J, Richter J, Robert Peters, Rojas O de Souza S M Ohanyan V Khurshudyan M, Rule K C, Sakai T, Sakai T, Schnack J, Shijie Hu, Takano K, Tonegawa T, Wolf B, Zhitomirsky M E, Čanova L, Čanova L   +30 more
core   +4 more sources

Raman spectroscopic analysis of azurite blackening

Journal of Raman Spectroscopy, 2008
AbstractAzurite is a basic copper carbonate pigment largely employed in painting realization. The areas painted with azurite are easily alterable and are often less resistant than the other parts of artworks. The azurite alteration in a black pigment, the copper oxide (tenorite), has been studied by micro‐Raman spectroscopy.
Claudia Pelosi
exaly   +3 more sources