Chemistry and structure of glass-ceramic materials for high precision optical applications

Petzoldt, Joseph; Pannhorst, W.

doi:10.1016/0022-3093(91)90095-n

Cited by 51 publications

(25 citation statements)

References 4 publications

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“…Therefore, these cation sites are fully occupied with Nb and Si and no vacancies were obtained. The primary titanate nuclei in most glass-ceramic systems are not rutile, but more complex titanate-type phases [14,19]. It can be considered that by increasing the time of heating at the same temperature, a heterogenous interaction on titanate and subsequent growth of the crystals occurred.…”

Section: Resultsmentioning

confidence: 99%

DTA study of the crystallization of Li2O–Nb2O5–SiO2–TiO2 glass

Živanovic

Tošić

Grujić

et al. 2015

J Therm Anal Calorim

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In this study, the crystallization of 30Li 2 OÁ 15Nb 2 O 5 Á50SiO 2 Á5TiO 2 (mol%) glass was examined. The parent glass was prepared by the standard melt quenching method, and the investigations were performed under nonisothermal and isothermal conditions using the DTA, XRD, SEM and EDS methods. The results revealed primary crystallization of this glass and the dendritic morphology of crystal growth. Three crystalline phases were formed in the glass matrix during crystallization, whereby LiNbO 3 was formed as the primary phase, followed by Li 2 Si 2 O 5 and SiO 2 as the secondary. The surface and volume mechanisms of crystallization occur. The condition that both the mechanisms were dominant was determined. In the case of volume crystallization, the characteristics of the nucleation process were examined. The kinetic parameters of crystallization under different mechanisms of crystallization were determined.

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Section: Resultsmentioning

confidence: 99%

DTA study of the crystallization of Li2O–Nb2O5–SiO2–TiO2 glass

Živanovic

Tošić

Grujić

et al. 2015

J Therm Anal Calorim

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“…XRD pattern reveals that the as-cast glass obtained an amorphous phase consistent with the appearance of this glass which looked clear implying that no phase-separation occurred in this glass. After heat , Zn + and Al 3+ stabilized β-quartz until it did not transform into the low-quartz-solid-solution during the process of cooling down to room temperature 19 . The virgilite formation was due to the slow reaction rates in the Li 2 O-Al 2 O 3 -SiO 2 system, which needed high pressure and temperature.…”

Section: Phase Formationmentioning

confidence: 99%

Effect of Pre-Crystallization on Lithium Disilicate Glass-Ceramics Fabricated by Different Processes

Monmaturapoj

Srion

Chunkiri

2016

Phosphorus Research Bulletin

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SiO 2 -Li 2 O-K 2 O-Al 2 O 3 -P 2 O 5 based lithium disilicate glass ceramic was prepared and fabricated into dental crowns. The influence of factors such as pre-crystallization temperature and fabrication technique on the phase formation and morphology of the glass ceramic was investigated. Differential thermal analysis (DTA), X-ray diffraction (XRD), scanning and transmission electron microscopies (SEM and TEM) were performed to determine the thermal properties, the phase formation and microstructure of the samples, respectively. The composition of lithium disilicate glass ceramic could be fabricated into dental crowns through the hot-pressing and CAD/CAM techniques. Similarities in phase formation have been revealed on the dental crown samples after fabrication by both methods. The dental crown samples fabricated by the CAD/CAM technique exhibited significantly finer needle-like crystals of lithium disilicate. The pre-cerammed ingots and fabrication technique have no significant change on the phase formation; however, they play important roles in changing the morphology of the samples in this study.

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“…The market for precision optical applications of glass-ceramics is smaller, though it is developing [4]. There are transparent low thermal expansion glass-ceramics based on the LAS system for large type telescope mirror blanks, for ring laser gyroscopes and optical parts [5][6][7]. Transparent glass-ceramics based on fluoride [8][9][10][11][12], oxyfluoride [13][14][15][16][17][18][19][20][21][22][23][24][25][26], chalcogenide [27,28] glasses, and doped by rare-earth ions are successfully used for wavelength up-conversion devices, for erbium doped waveguide amplifiers [29].…”

Section: Introductionmentioning

confidence: 99%