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Sebastian, Mailadil Thomas; Pullar, Robert C.

doi:10.1002/9781119208549.ch6

Cited by 2 publications

(3 citation statements)

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“…These have been studied in a variety of contexts including nuclear waste immobilization, 35 solid oxide fuel cells and sensors, phosphors, and laser technology, [36][37][38][39] and for their petrologic and geochronologic importance. 40,41 Data from the REO 1.5 -SiO 2 [42][43][44][45] and AlO 1.5 -REO 1.5 34,[46][47][48][49][50][51][52][53][54][55][56] binary systems, studies into apatite crystal chemistry 13,15,35,36,57,58 for calcium-containing rare earth apatite stability, and the literature on T/EBC-CMAS interactions 6,7,12,18 were used to infer the stability of the endmembers at 1400 • C. The results are plotted in Figure 1 as a function of the 8-fold coordinated RE ion radii. 59 With increasing RE ion radius, the stability of the Ca-free apatite increases while that of the pure aluminate garnet endmember decreases.…”

Section: Introductionmentioning

confidence: 99%

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

2021

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This work advances the understanding of the influence of rare earth (RE) ion radius on the stability and extent of the garnet solid solution phase in the (ytterbia/yttria/gadolinia)‐calcia‐magnesia‐alumina‐silica systems. Guided by the crystal chemistry and charge neutrality constraints, selected compositions in the notional garnet stability field were synthesized, equilibrated at 1400°C, and characterized to determine the equilibrium phases and their compositions. The results show a significant reduction in the stability of the silicate garnet relative to apatite with increasing RE ion radius. Apatite was not observed for any composition in the Yb‐containing system, the Y‐containing system formed both garnet and apatite, and there was no evidence of silicate garnets in the Gd‐containing system. However, despite the apparent differences in stability relative to apatite, the extent of the garnet solid solution increases only slightly for the Yb‐ compared to Y‐containing systems. The quantitative microchemical analysis suggests that Mg2+ prefers the octahedral site over the dodecahedral site in the garnet structure, and that the solubility of Mg2+ in the dodecahedral site increased in the system containing Yb3+ compared to Y3+. The results are discussed for their relevance to reactions between RE‐containing thermal and environmental barrier coatings and CMAS‐type silicate deposits.

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Section: Introductionmentioning

confidence: 99%

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

2021

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“…In recent years, with the development of the communication industry, the advantages of microwave dielectric ceramic materials have been explored. With its excellent dielectric properties, it has been often used in microwave components such as filters and resonators . The hot research on BaO–TiO 2 microwave dielectric ceramics has been developed rapidly for the past few year .…”

Section: Introductionmentioning

confidence: 99%

“…With its excellent dielectric properties, it has been often used in microwave components such as filters and resonators. [1][2][3] The hot research on BaO-TiO 2 microwave dielectric ceramics has been developed rapidly for the past few year. 4 It made significant contributions to the miniaturization and integration of the whole microcircuit system.…”

Section: Introductionmentioning

confidence: 99%

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

Luo

Yang

et al. 2019

J Am Ceram Soc

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Ba2Ti9O20 single‐phase ceramics were prepared by reaction sintering method using TiO2 and BaCO3 as raw materials after heat treating at 1150°C for 10 hours. Furthermore, the formation mechanism and microstructure evolution of Ba2Ti9O20 ceramics prepared by reaction sintering method were investigated. The formation behavior of Ba2Ti9O20 phase was analyzed from the perspective of diffusion, where the reaction activation energy required for the process was calculated to be about 386.17 kJ/mol. Combined with the scanning electron microscopy and the energy dispersive spectrometer, it was revealed that the pores on Ba2Ti9O20 grains in the process of reaction sintering might be caused by the absence of oxygen element. Meanwhile, the reason for the roughness of ceramic surface was that the local inhomogeneous distribution of barium on the surface of Ba2Ti9O20 grain leaded to the enrichment of titanium.

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Other Important Materials

Cited by 2 publications

References 306 publications

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method

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Other Important Materials

Cited by 2 publications

References 306 publications

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

Apatite and garnet stability in the Al–Ca–Mg–Si–(Gd/Y/Yb)–O systems and implications for T/EBC: CMAS reactions

Formation mechanism and microstructure evolution of Ba2Ti9O20 ceramics by reaction sintering method

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Formation mechanism and microstructure evolution of Ba₂Ti₉O₂₀ ceramics by reaction sintering method