A purple barium copper silicate pigment from early China

FitzHugh, Elisabeth West; Zycherman, Lynda A.

doi:10.1179/sic.1992.37.3.145

Cited by 33 publications

(5 citation statements)

References 3 publications

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“…The Chinese chromophore technology was very specific with, for instance, the use of barium derivatives to produce violet, blue, and green colors [96][97][98] with a composition similar to that of Egyptian blue and green [99,100]. In actuality, great technological improvements took place during the 8 th century in China (Tang porcelains [55,[101][102][103]) and the 9 th century in the Ancient World (Abbasids pottery [57,104,105]).…”

Section: The Development Of Solid State Chemistry and Related Technolmentioning

confidence: 99%

The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview

Colomban

2013

Arts

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The birth of Chemistry can be found in two main practices: (i) the Arts du feu (ceramic and glass, metallurgy, i.e., inorganic and solid state chemistry) and (ii) the preparation of remedies, alcohols and perfumes, dyes, i.e., organic and liquid state chemistry). After a brief survey of the history of (glazed) pottery and (enameled) glass artifacts, the development of destructive and non-destructive analytical techniques during the last few centuries is reviewed. Emphasis is put on mobile non-destructive Raman microspectroscopy of pigments and their glass/glaze host matrices for chronological/technological expertise. The techniques of white opacification, blue, yellow, green, red, and black coloring, are used as examples to point out the interest of pigments as chronological/technological markers

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Section: The Development Of Solid State Chemistry and Related Technolmentioning

confidence: 99%

The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview

Colomban

2013

Arts

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“…BaCuSi 4 O 10 was used in many Chinese artifacts as a synthetic pigment. It was named Han Blue by FitzHugh and Zycherman [1]. The stable blue color is rare in nature; therefore, the chemical development and the production of blue pigments began in ancient times with Egyptian Blue (CaCuSi 4 O 10 ) in Egypt and Han Blue (BaCuSi 4 O 10 ) and Han Purple (BaCuSi 2 O 6 ) in China [2].…”

Section: Introductionmentioning

confidence: 99%

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Masunaga

Rebello

Schye

et al. 2015

Journal of Physics and Chemistry of Solids

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Sleep Slow Oscillations (SSOs), paradigmatic EEG markers of cortical bistability (alternation between cellular downstates and upstates), and sleep spindles, paradigmatic EEG markers of thalamic rhythm, are two hallmarks of sleeping brain. Selective thalamic lesions are reportedly associated to reductions of spindle activity and its spectrum~14 Hz (sigma), and to alterations of SSO features. This apparent, parallel behavior suggests that thalamo-cortical entrainment favors cortical bistability. Here we investigate temporally-causal associations between thalamic sigma activity and shape, topology, and dynamics of SSOs. We recorded sleep EEG and studied whether spatio-temporal variability of SSO amplitude, negative slope (synchronization in downstate falling) and detection rate are driven by cortical-sigma-activity expression (12-18 Hz), in 3 consecutive 1 s-EEG-epochs preceding each SSO event (Baselines). We analyzed: (i) spatial variability, comparing maps of baseline sigma power and of SSO features, averaged over the first sleep cycle; (ii) event-by-event shape variability, computing for each electrode correlations between baseline sigma power and amplitude/slope of related SSOs; (iii) eventby-event spreading variability, comparing baseline sigma power in electrodes showing an SSO event with the homologous ones, spared by the event. The scalp distribution of baseline sigma power mirrored those of SSO amplitude and slope; event-by-event variability in baseline sigma power was associated with that in SSO amplitude in fronto-central areas; within each SSO event, electrodes involved in cortical bistability presented higher baseline sigma activity than those free of SSO. In conclusion, spatio-temporal variability of thalamocortical entrainment, measured by background sigma activity, is a reliable estimate of the cortical proneness to bistability.

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“…The idea that perfectly frustrated competing interactions could lead to an effective reduction of d has been both proposed [3][4][5] and contested [6][7][8] to explain the physics of BaCuSi 2 O 6 . This S ¼ 1=2 material, known as Han purple from its use as a pigment in ancient China [9,10], presents a three-dimensional (3D) stack of Cu 2þ bilayers [ Fig. 1(a)] with dominant antiferromagnetic (AF) dimerization, significant intrabilayer interactions, and a geometrically exact offset between adjacent bilayers, but was reported to show 2D scaling exponents around the field-induced QPT [3].…”

mentioning

confidence: 99%

Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi2O6

et al. 2020

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A purple barium copper silicate pigment from early China

Cited by 33 publications

References 3 publications

The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview

The Destructive/Non-Destructive Identification of Enameled Pottery, Glass Artifacts and Associated Pigments—A Brief Overview

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

Multiple Magnetic Bilayers and Unconventional Criticality without Frustration in BaCuSi2O6

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