Replacement of Potassium Ions in Solid Potassium Hexatitanate by Sodium Ions from a Chloride Flux

Plumley, A.L.; Orr, W.C.

doi:10.1021/ja01467a008

Cited by 11 publications

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“…Jeppeite is monoclinic, C2/m, with parameters a The X-ray powder data for jeppeite (Table II) are from Guinier films taken with Cu-Kct, KC1 internal standard, I visual. The line measurements correlate approximately with the unindexed data of Berry et al (1960) and with the indexed set of Plumley and Orr (1961), PDF card No. 13-574 for artificial K2Ti6013.…”

supporting

confidence: 80%

Jeppeite, a new K-Ba-Fe titanate from Walgidee Hills, Western Australia

Pryce¹

1984

Mineral. mag.

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Jeppeite, a new mineral, similar in composition to and overgrown on priderite, has been found in the lamproite plug of Walgidee Hills (18° 19′ S, 124° 51′ E), Western Australia. The mineral is named for the discoverer, Dr J. Jeppe. It is monoclinic, C2/m, a 15.453 b 3.8368 c 9.123 Å β 99.25°, strongest powder lines 4.50(002) (4), 3.07(310) (10), 2.99(003,31) (10), 2.961(20) (4), 2.812(311,112) (10), 2.091 (6), 2.074 (6), 1.919 (8) similar to artificial K2Ti6O13. The sparse eluvial crystals are black, elongated along b, bounded by {100}, {20} faces (Λ 45°) and {010}; perfect 100 and good 20 cleavages or partings, submetallic lustre, pale-brown streak, brittle, and cleave into (100) flakes. Dobs 3.94, Dcalc 3.98. Colour values for illuminant C from reflectance spectra for Rp, Rb, and Rθ are: Y% 13.3, 14.4, 16.6; λd 474, 473, 475; and Pe% 5.1, 4.5, 4.3. Refractive indices from reflectances at 590 nm in air are 2.13, 2.21 and 2.35. In thin section, αΛα10° blue, β = b dark greenish brown almost to black, γ = c brown. Bireflectance and birefringence positive. H 5–6, VHN100 orientation dependent; for indentations normal to b 664–773.Jeppeite is common in the lamproite as prismatic to acicular aggregates associated with priderite, richterite, shcherbakovite, wadeite, perovskite, and apatite in a green and white celadonite and chlorite matrix, with a little calcite and sphene, after olivine, pyroxene, and leucite.Electron probe analysis, using Fe, Ti, nepheline, and benitoite standards, gave K2O 8.47, BaO 17.35, TiO2 69.29, Fe2O3 (total Fe) 4.74, sum 99.85%; (Mg, Na, Zr detected). This analysis calculates to (K1.15,Ba0.73)Σ1.88 (Ti5.56, Fe3+0.38)Σ5.94O13, or ideally, (K,Ba)2(Ti,Fe)6O13.

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confidence: 80%

Jeppeite, a new K-Ba-Fe titanate from Walgidee Hills, Western Australia

Pryce¹

1984

Mineral. mag.

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“…When α increases to six, the product is long NMTO whiskers (Figure 4b3 and Figure 5b3). Although the equilibrium constant for NaCl( l ) + K + ( s ) → Na + ( s ) + KCl( l ) is 1 [16], the K + ions in the layer structured KMTO can still be displaced by Na + via ion exchange when the concentration of surrounding Na + ions is sufficiently large. The above experimental results indicate that the molten salt does not only provide a liquid phase environment for reactions, however the cations may also participate in reactions and strongly affect the growth of crystalline products.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Morphology Control of Potassium Magnesium Titanates and Sodium Iron Titanates by Molten Salt Synthesis

Zhang

Zhou

et al. 2019

Materials

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Titanates materials have attracted considerable interest due to their unusual functional and structural properties for many applications such as high-performance composites, devices, etc. Thus, the development of a large-scale synthesis method for preparing high-quality titanates at a low cost is desired. In this study, a series of quaternary titanates including K0.8Mg0.4Ti1.6O4, Na0.9Mg0.45Ti1.55O4, Na0.75Fe0.75Ti0.25O2, NaFeTiO4, and K2.3Fe2.3Ti5.7O16 are synthesized by a simple molten salt method using inexpensive salts of KCl and NaCl. The starting materials, intermediate products, final products, and their transformations were studied by using TG-DSC, XRD, SEM, and EDS. The results show that the grain size, morphology, and chemical composition of the synthesized quaternary titanates can be controlled simply by varying the experimental conditions. The molar ratio of mixed molten salts is critical to the morphology of products. When KCl:NaCl = 3:1, the morphology of K0.8Mg0.4Ti1.6O4 changes from platelet to board and then bar-like by increasing the molar ratio of molten salt (KCl–NaCl) to raw materials from 0.7 to 2.5. NaFeTiO4 needles and Na0.75Fe0.75Ti0.25O2 platelets are obtained when the molar ratio of molten salt (NaCl) to raw materials is 4. Pure phase of Na0.9Mg0.45Ti1.55O4 and K2.3Fe2.3Ti5.7O16 are also observed. The formation and growth mechanisms of both potassium magnesium titanates and sodium iron titanates are discussed based on the characterization results.

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“…[2][3][4] However, superfine K 2 Ti 6 O 13 fibers (diameter is less than 0.5micron) are often obtained during large scale manufacture process which show poor performances. In this work, Flux method [5] is used to control the surface morphologies and crystal structures of these fine K 2 Ti 6 O 13 fibers. The reaction and crystal growth mechanism of fibers in flux are discussed.…”

Section: Introductionmentioning

confidence: 99%

Control of Surface Morphologies and Crystal Structures of Potassium Titanate Fibers by Flux Method

Liu

Qin

Yang

et al. 2007

KEM

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In this work, flux method is used to control the surface morphologies and crystal structures of the fine K2Ti6O13 fibers. When K2CO3 as a flux is added into fine K2Ti6O13 fibers and heated at 1100oC for 2h, the crystal of fibers are transformed to K2Ti4O9 and K2Ti2O5, however, the resulting fibers have no significant change in morphologies. On the other hand, when KCl is used as flux (15wt%) and heated at 1200oC for 2h, the diameters of the resulting fibers become about 2 micron without any change of the crystal structure.

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Replacement of Potassium Ions in Solid Potassium Hexatitanate by Sodium Ions from a Chloride Flux

Cited by 11 publications

References 0 publications

Jeppeite, a new K-Ba-Fe titanate from Walgidee Hills, Western Australia

Jeppeite, a new K-Ba-Fe titanate from Walgidee Hills, Western Australia

Microstructure and Morphology Control of Potassium Magnesium Titanates and Sodium Iron Titanates by Molten Salt Synthesis

Control of Surface Morphologies and Crystal Structures of Potassium Titanate Fibers by Flux Method

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