X-Ray Diffraction Analysis of Barium-Strontium Sulfate (Barite-Celestite) Solid Solutions

Goldish, Elihu

doi:10.1017/s0885715600013750

Cited by 14 publications

(14 citation statements)

References 3 publications

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“…within and parallel to the mirror planes), while the distance between mirror planes is less accommodating and increases the b-axis length above the expected mean. The similar results are also presented in BaSO 4 -SrSO 4 solid solution (Goldish, 1989). The variation in the unit cell volume, as shown in Fig.…”

Section: Resultssupporting

confidence: 83%

Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Lee¹,

Wang²,

Iizuka³

et al. 2005

Zeitschrift Für Kristallographie - Crystalline Materials

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Hokutolite / Solid solution / Raman spectroscopy / Single crystal structure analysis / X-ray diffraction Abstract. Natural hokutolite, (Ba,Pb)SO 4 , is a radioactive sulfate mineral occurring in hot-spring deposit. Unlike the limited PbSO 4 content observed in natural specimens, the present study reveals that (Ba,Pb)SO 4 crystals can be grown with compositions covering the whole solid solution series of PbSO 4 and BaSO 4 . X-ray measurements show that the unit cell parameters gradually increase with increasing BaSO 4 content. The nonlinear behavior of the unit cell dimensions with composition shows that a positive deviation from linear variation exists in the b-axis direction and negative deviations for a-and c-axes. It is evident that the variations in the M-O bond lengths result in the significantly negative deviations of all unit cell parameters from Vegard's rule around 70 mol% BaSO 4 . Hence, the abnormally negative deviations of all unit cell parameters from Vegard's rule are primarily attributed to the discontinuities in the mean M-O bond lengths. In addition, the existence of structure gap in natural hokutolite samples reported may be ascribed to the same reason.Raman bands in these synthetic crystals show monotonous changes in n 1 frequency from anglesite to barite. It is inferred that the slight decrease in n 1 frequency for crystals with BaSO 4 content being smaller than 20 mol% may be attributed to the net effect of the S-O force constants, intertetrahedral O-O force constants, and distortions of SO 4 tetrahedra. The present results also indicate that the positional disordering along the solid solution series is responsible for the Raman line broadening, showing the local maximum in the line width plot occurs at about 50 mol% substitution. This work also demonstrates that variations of Raman shift of n 1 band as well as its line width are essentially related to the random Pb-Ba substitution in our synthetic crystals.

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Section: Resultssupporting

confidence: 83%

Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Lee¹,

Wang²,

Iizuka³

et al. 2005

Zeitschrift Für Kristallographie - Crystalline Materials

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“…Goldish (1989) emphasized that synthetic solid solution unit cell parameters show deviations from Yegard's Law, concerning mostly the c parameter, and he therefore suggests that the SrS04 molar fraction can be derived from the (Siemens, 1993). Cell dimensions were refined using the 28 values for 30 centred retlections with 25~28~45.…”

Section: X-ray Crystallographymentioning

confidence: 99%

“…II is known that a solid-solution series is formed over the entire compositional range (Bostrom et al, J968;Browner, 1973) and that the unit cell cdges vary non-linearly with composition (Bostrom et al 1968;Burkhard, 1973;Goldish, 1989 (Hanor, 1968;Bouhlel, 1985). The end-member celestine structure type was first determined by James and Wood (1925) and later refined by Garske and Peacor (1965), Hawthorne and Ferguson (1975) and Miyake et al (1978), but the role of Ba in naturally occurring samples has not been thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

Ba-rich celestine: new data and crystal structure refinement

1997

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“…BaSO 4 and SrSO 4 are currently thought to be isostructural (space group P nma), and belong to a group of minerals with the barite structure, where each metal (M) atom is coordinated by 12 oxygen atoms from 6 neighbouring SO 4 tetrahedra, resulting in edge sharing SO 4 and MO 12 polyhedra [9]. The high pressure elastic and vibrational properties of BaSO 4 [10][11][12][13][14][15] and PbSO 4 [12,16] were studied with Raman and in situ X-ray diffraction. For BaSO 4 transitions towards the high pressure phases have been reported at ≈10 GPa [12] and between 15 -27 GPa, depending on the pressure transmitting medium used [13].…”

Section: Introductionmentioning

confidence: 99%

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

Girard¹,

Stękiel²,

Spahr³

et al. 2018

J. Phys.: Condens. Matter

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In order to resolve inconsistencies encountered in published data for SrSO4, the elasticity and the phase stability of celestite has been studied using thermal diffuse scattering, high pressure powder synchrotron X-ray diffraction, Raman scattering and DFT calculations. The structure of SrSO4 is found to be stable up to 62 GPa at ambient temperature. The preferred values for the components of the elastic stiffness tensor have been determined using X-ray thermal diffuse scattering and are (in GPa): c11 = 105, c22 = 92, c33 = 114, c44 = 16, c55 = 31, c66 = 26, c12 = 40, c13 = 52, c23 = 37. The preferred value for the bulk modulus is K=62(2) GPa. This work shows that thermal diffuse scattering collected at two temperatures allows the determination of the full elastic tensor of crystals with low space group symmetry.

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X-Ray Diffraction Analysis of Barium-Strontium Sulfate (Barite-Celestite) Solid Solutions

Cited by 14 publications

References 3 publications

Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Ba-rich celestine: new data and crystal structure refinement

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

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X-Ray Diffraction Analysis of Barium-Strontium Sulfate (Barite-Celestite) Solid Solutions

Cited by 14 publications

References 3 publications

Crystal structure and Raman spectral studies of BaSO4—PbSO4 solid solution

Crystal structure and Raman spectral studies of BaSO4—PbSO4 solid solution

Ba-rich celestine: new data and crystal structure refinement

Structural, elastic and vibrational properties of celestite, SrSO4, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering

Contact Info

Product

Resources

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Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Crystal structure and Raman spectral studies of BaSO₄—PbSO₄ solid solution

Structural, elastic and vibrational properties of celestite, SrSO₄, from synchrotron x-ray diffraction, thermal diffuse scattering and Raman scattering