Synthesis of leucite from potash feldspar

Abstract

Leucite particles were synthesized from feldspar mixed with 0% to 52% potassium nitrate fi red from 800 °C to 1 200 °C by solid state method. The X-ray Diffraction (XRD) patterns show that in the temperature range from 800 °C to 1 200 °C, the leucite can be removed as the single crystalline phase. Kalsilite may be crystallized with leucite at 800 °C, but can be eliminated after prolonged heating. The scanning electron Microscopy (SEM) images clearly display the that crystals of micrometer scale leucite, and the leucite crystals distribute evenly in the matrix. The Thermal expansion coeffi cient (TEC) of the samples fabricated is as high as 20.52sx10⁻⁶ °C⁻¹ measured from 20 °C to 500 °C. The mechanism of transformation from feldspar to leucite was proposed.

Keywords

leucite / synthesis / potash feldspar

References

[1] Kelly J. R., Nishimural I., Campbell S. D. Ceramics in Dentistry: Historical Roots and Current Perspectives[J]. J. Prosth. Dent., 1996, 75: 18-32.

[2] Panzera C, Mead B, Kaiser L M. Method of Manufacture of Dental Porcelain Having Small Leucite Crystallites[P]. US patent 6 660 073, 2003-12-9

[3] Mackert J. R., Evans A. L. Quantitative X-ray Diffraction Determination of Leucite Thermal Instability in Dental Porcelain[J]. J. Am. Ceram. Soc., 1991, 74: 450-453.

[4] Combe E C, Trevor-Burke F J, Douglas W H. Dental Biomaterials[M]. Kluwer Academic Publishers, 1999, 326

[5] Mackert J. R., Twiggs S. W. Isothermal Anneal Effect on Leucite Content in Dental Porcelain[J]. J. Dent. Res., 1995, 74: 1259-1265.

[6] Taylor D., Henderson C. M. B. The Thermal Expansion of the Leucite Group of Minerals[J]. Am. Mineral., 1968, 53: 1476-1489.

[7] Sheu T. S., O’Brien W. J., Rasmussen S. T. Mechanical Properties and Thermal Expansion Behavior in Leucite Containing Materials[J]. J. Mater. Sci., 1994, 29: 125-128.

[8] Oishi S., Miyata T., Suzuki T. Growth of Leucite Crystals from a K₂Mo₂O₇ Flux[J]. J. Mater. Sci. Lett., 2003, 22: 927-929.

[9] Zhang Y., Wu J. Q., Rao P. G., . Low Temperature Synthesis of High Purity Leucite[J]. Mater. Lett., 2006, 60: 2819-2823.

[10] Erbe E M, Sapieszko R S. Chemically Derived Leucite[P]. US patent 5622551, 1997-4-22

[11] Novotna M., Satava V., Kostka P. Synthesis of Leucite for Application in Dentistry[J]. Glass Tech., 2004, 45: 105-107.

[12] Novotna M., Satava V., Lezal D. Preparation of Leucite Based Materials[J]. Solid State Phenom., 2003, 90: 377-382.

[13] Zhang Y., Lv M., Chen D. D., . Leucite Crystallization Kinetics with Kalsilite as a Transition Phase[J]. Mater. Lett., 2007, 61: 2978-2981.

[14] Zhang Y., Li B., Rao P. G., . Seeded Crystallization of Leucite[J]. J. Am. Ceram. Soc., 2007, 90(5): 1615-1618.

[15] Zhang Y., Lv M., Rao P. G., . Quantitative XRD Analysis of Hydrothermally-derived Leucite Content in Dental Porcelain Ceramics[J]. J. Ceram. Soc. Jpn., 2007, 115(5): 329-332.

[16] Zhang Y., Qu C., Rao P. G., . Nanocrystalline Seeding Effect on the Crystallization of Two Leucite Precursors[J]. J. Am. Ceram. Soc., 2007, 90(8): 2390-2398.

[17] Ota T., Takahashi M., Yamai I., . High-thermal-expansion Polycrystalline Leucite Ceramic[J]. J. Am. Ceram. Soc., 1993, 76: 2379-2380.

[18] Höland W., Frank M., Rheinberger V. Surface Crystallization of Leucite in Glass[J]. J. Non-Crystal. Solids, 1995, 180: 292-307.

[19] Zhang B., Peng B., Duan X.L., . A New Technology of Microcrystallizing Leucite to Reinforce Dental Glass Ceramics[J]. J. Wuhan Univ. Technol., 1999, 19: 94-95.

[20] Bedard R L, Flanigen E M. High Density Leucite Based Ceramics from Zeolite[P]. US patent, 5071801, 199112-10

[21] Burk B, Burnett A P. Leucite-containing Porcelains and Method of Making Same[P]. US patent 4101330, 1978-7-18

[22] Kacicz J M, Fonvielle F P. Leucite Porcelain[P]. US patent 4604366, 1986-8-5

[23] Hashimoto S., Yamaguchi A., Fukuda K. Synthesis of Leucite Crystals Using Potash Feldspar[J]. J. Ceram. Soc. Jpn., 2004, 112: 242-244.

[24] Qiu Y., Gao L. Novel Way to Synthesize Nanocrystalline Aluminum Nitride from Coarse Aluminum Powder[J]. J. Am. Ceram. Soc., 2003, 86: 1214-1216.

[25] Liu C. L., Komarneni S., Roy R. Seeding Effect on Crystallization of KAlSi₃O₈, RbAlSi₃O₈ and CsAlSi₃O₈ Gels and Glasses[J]. J. Am. Ceram. Soc., 1994, 77: 3105-3112.

[26] Hoèland W., Rheinberger V., Wegner S. Needle-like Apatiteleucite Glass-ceramic as a Basematerial for the Veneering of Metal Restorations in Dentistry[J]. J. Mater. Sci.: Mater. Med., 2000, 11: 11-17.

[27] Levin E M, Robbins C R, Mcmurdie H F. Phase Diagrams for Ceramists[J]. The American Ceramic Society, 1964:158

[28] Rouf M. A., Hermansson L., Carlsson R. Crystallization of Glasses in the Primary Phase Field of Leucite in the K₂OAl₂O₃-SiO₂ System[J]. Trans. J. Brit. Ceram. Soc., 1978, 77: 32-35.

[29] Levin E M, Robbins C R, Mcmurdie H F. Phase Diagrams for Ceramists[J]. The American Ceramic Society, 1964:158