Four monazite type structures: comparison of SrCrO4, SrSeO4, PbCrO4(crocoite), and PbSeO4

Effenberger, H.; Pertlik, F.

doi:10.1524/zkri.1986.176.12.75

Cited by 9 publications

(15 citation statements)

References 12 publications

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“…with unit-cell parameters: a = 7.065(7) Å, b = 7.376(7) Å, c = 6.741(7) Å, and β = 103.1(1)º, in good agreement with the literature. 5,7 For the HP Raman measurements, we used a diamond-anvil cell (DAC) equipped with 250 μm diameter diamond culets. Rhenium gaskets were indented to a thickness of 40 m.…”

Section: Methodsmentioning

confidence: 99%

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High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄

et al. 2018

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We studied the electronic and vibrational properties of monazite-type SrCrO under compression. The study extended the pressure range of previous studies from 26 to 58 GPa. The existence of two previously reported phase transitions was confirmed at 9 and 14 GPa, and two new phase transitions were found at 35 and 48 GPa. These transitions involve several changes in the vibrational and transport properties with the new high-pressure phases having a conductivity lower than that of the previously known phases. No evidence of chemical decomposition or metallization of SrCrO was detected. A tentative explanation for the reported observations is discussed.

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Section: Methodsmentioning

confidence: 99%

“…The crystal structure of SrCrO4 at ambient conditions is well known, being isomorphic to the monazite structure (space group P21/n). 5 It consists of Sr atoms coordinated by nine oxygen atoms and distorted CrO4 tetrahedral units. Its main physical properties at atmospheric conditions have been studied experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄

et al. 2018

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“…We have found that all the experiments performed below 4.5 GPa could be undoubtedly assigned to the monazite-type structure determined by Effenberg and Pertlik. 41 This structure is usually described by space group P2 1 /n, where b is the unique crystallographic axis (with a > c). The unit-cell parameters determined from our single-crystal XRD experiments are summarized in Table 1.…”

Section: Structural Analysismentioning

confidence: 99%

High-Pressure Single-Crystal X-ray Diffraction of Lead Chromate: Structural Determination and Reinterpretation of Electronic and Vibrational Properties

et al. 2019

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We have investigated the high-pressure behavior of PbCrO4. In particular, we have probed the existence of structural transitions under high pressure (at 4.5 GPa) by single-crystal X-ray diffraction and density functional theory calculations. The structural sequence of PbCrO4 is different than previously determined. Specifically, we have established that PbCrO4, under pressure, displays a monoclinic–tetragonal phase transition, with no intermediate phases between the low-pressure monoclinic monazite structure (space group P21/n) and the high-pressure tetragonal structure. The crystal structure of the high-pressure polymorph is, for the first time, undoubtedly determined to a tetragonal scheelite-type structure (space group I41/a) with unit-cell parameters a = 5.1102(3) Å and c = 12.213(3) Å. These findings have been used for a reinterpretation of previously published Raman and optical-absorption results. Information of calculated infrared-active phonons will be also provided. In addition, the pressure dependence of the unit-cell parameters, atomic positions, bond distances, and polyhedral coordination are discussed. The softest and stiffest direction of compression for monazite-type PbCrO4 are also reported. Finally, the theoretical pressure dependence of infrared-active modes is given, for the first time, for both polymorphs.

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“…The transparent prismatic to acicular crystals display bright colours, ranging from red to hyacinth red, reddish orange, orange and yellow (Figure 8A). The structure of crocoite is monazitetype, with a tetrahedral anion group XO 4 , where X = Cr (Quareni and De Pieri 1965;Effenberger and Pertlik 1986a). According to Loeffler and Burns (1976), the red-orange colour of crocoite is due to the oxygen (O 2− ) to metal (Cr 6+ ) charge-transfer within the CrO 4 2− group, which determines a strong absorption of the visible light in the violet-green domain.…”

Section: Mineralogical Phases Structure and Occurrencementioning

confidence: 99%

Pigments—Lead-based whites, reds, yellows and oranges and their alteration phases

Gliozzo

Ionescu

2021

Archaeol Anthropol Sci

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This review summarises the state-of-the-art of lead-based pigment studies, addressing their production, trade, use and possible alteration. Other issues, such as those related to the investigation and protection of artworks bearing lead-based pigments are also presented. The focus is mineralogical, as both raw materials and degradation products are mineral phases occurring in nature (except for very few cases). The minerals described are abellaite, anglesite, blixite, caledonite, challacolloite, cerussite, cotunnite, crocoite, galena, grootfonteinite, hydrocerussite, laurionite, leadhillite, litharge, macphersonite, massicot, mimetite, minium, palmierite, phosgenite, plattnerite, plumbonacrite, schulténite, scrutinyite, somersetite, susannite, vanadinite and an unnamed phase (PbMg(CO3)2). The pigments discussed are lead white, red lead, litharge, massicot, lead-tin yellow, lead-tin-antimony yellow, lead-chromate yellow and Naples yellow. An attempt is made to describe the history, technology and alteration of these pigments in the most complete manner possible, despite the topic's evident breadth. Finally, an insight into the analytical methods that can (and should) be used for accurate archaeometric investigations and a summary of key concepts conclude this review, along with a further list of references for use as a starting point for further research.

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Four monazite type structures: comparison of SrCrO₄, SrSeO₄, PbCrO₄(crocoite), and PbSeO₄

Abstract: For a crystal chemical comparison within the monazite type structure the crystal structures of SrCr0 4 , SrSe0 4 , PbCr0 4 (crocoite), and PbSe0 4 were refined [space group

Cited by 9 publications

References 12 publications

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄

High-Pressure Single-Crystal X-ray Diffraction of Lead Chromate: Structural Determination and Reinterpretation of Electronic and Vibrational Properties

Pigments—Lead-based whites, reds, yellows and oranges and their alteration phases

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Four monazite type structures: comparison of SrCrO4, SrSeO4, PbCrO4(crocoite), and PbSeO4

Abstract: For a crystal chemical comparison within the monazite type structure the crystal structures of SrCr0 4 , SrSe0 4 , PbCr0 4 (crocoite), and PbSe0 4 were refined [space group

Cited by 9 publications

References 12 publications

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO4

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO4

High-Pressure Single-Crystal X-ray Diffraction of Lead Chromate: Structural Determination and Reinterpretation of Electronic and Vibrational Properties

Pigments—Lead-based whites, reds, yellows and oranges and their alteration phases

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Product

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Four monazite type structures: comparison of SrCrO₄, SrSeO₄, PbCrO₄(crocoite), and PbSeO₄

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄

High Pressure Raman, Optical Absorption, and Resistivity Study of SrCrO₄