Liquid Regions of Lanthanum-Bearing Aluminosilicates

Li, Yandong; Zhang, Tongsheng; Feng, Yefeng; Liu, Chengjun; Jiang, Maofa

doi:10.3390/ma13020450

Cited by 8 publications

(5 citation statements)

References 38 publications

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“…S5. When the obtained analytical data were plotted on a La 2 O 3 -SiO 2 -Al 2 O 3 phase diagram at 1873 K, 22) the corresponding points were distributed towards the stable region of the liquid phase from the point representing the doped LSO (Fig. 4).…”

Section: Chemical Compositions Of Constituent Phasesmentioning

confidence: 99%

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Optimized preparation of <i>c</i>-axis-aligned polycrystal of doped lanthanum silicate oxyapatite and evaluation of its electrical properties

Fukuda,

Okada,

Terao

et al. 2023

J. Ceram. Soc. Japan

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The two types of c-axis-aligned polycrystals of lanthanum silicate oxyapatite (LSO) doped with K 2 O and Al 2 O 3 were prepared by the templated grain growth method with different template/matrix mass ratios of 11.1/88.9 and 5.9/94.1. The template particles, K 2 O-and F-doped plate-like LSO crystals with developed {001} faces, and the matrix powder, mainly Al 2 O 3 -doped LSO, were those used in a previous study with the template/matrix mass ratio of 20.0/80.0. Considering the ionic conductivity and orientation degree of the three types of textured polycrystals, the intermediate mixing ratio of 11.1/88.9 was found to be optimal among the three, with the texture fraction of {0 0 l} apatite being 0.74. Thus, the random grain oriented polycrystal was prepared with the same bulk chemical composition as the control sample. As the temperature increased from 773 to 823 K, the bulk oxide-ion conductivity (• b ) of the textured polycrystal increased from 1.04 © 10 ¹3 to 1.71 © 10 ¹3 S cm ¹1 and the activation energy of conduction (E a ) was 0.61 eV. The • b value of the random grain oriented polycrystal increased steadily from 3.80 © 10 ¹5 to 5.26 © 10 ¹4 S cm ¹1 with increasing temperature from 773 to 973 K (E a = 0.92 eV). Comparing the • b values at the same temperatures, the former was 27.5 (773 K) and 21.2 (823 K) times higher than the latter. The chemical formula of the doped LSO in the textured polycrystal was determined from the average composition to be (La 9.59 K 0.09 □ 0.32 )(Si 5.50 Al 0.38 □ 0.12 )O 26 , where □ denotes vacancies in La and/or Si sites. The major chemical composition of the coexisting interstitial material was estimated to be 29.8 mol % La 2 O 3 , 44.9 mol % SiO 2 , and 25.3 mol % Al 2 O 3 . The mole fractions were determined by the lever rule to be 0.9824 for doped LSO and 0.0176 for interstitial material.

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Section: Chemical Compositions Of Constituent Phasesmentioning

confidence: 99%

“…The bulk chemical compositions of samples 1, 2, and A are also plotted in the diagram. The liquid region is determined in the ternary system at 1873 K in a previous study 22).…”

mentioning

confidence: 99%

Optimized preparation of <i>c</i>-axis-aligned polycrystal of doped lanthanum silicate oxyapatite and evaluation of its electrical properties

Fukuda,

Okada,

Terao

et al. 2023

J. Ceram. Soc. Japan

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“…The base compound, La 2 SiO 5 , is part of the system, SiO 2 -La 2 O 3 , with the compounds, La 2 Si 2 O 7 , La 2 SiO 5 , and La 4 Si 3 O 12 [57]. The compound, La 2 SiO 5 , has a P 2 1 /c monoclinic crystal structure [58].…”

Section: Phase Systems Of Phosphosilicatesmentioning

confidence: 99%

Influence of P and Ti on Phase Formation at Solidification of Synthetic Slag Containing Li, Zr, La, and Ta

et al. 2022

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In the future, it will become increasingly important to recover critical elements from waste materials. For many of these elements, purely mechanical processing is not efficient enough. An already established method is pyrometallurgical processing, with which many of the technologically important elements, such as Cu or Co, can be recovered in the metal phase. Ignoble elements, such as Li, are known to be found in the slag. Even relatively base or highly redox-sensitive elements, such as Zr, REEs, or Ta, can be expected to accumulate in the slag. In this manuscript, the methods for determining the phase formation and the incorporation of these elements were developed and optimized, and the obtained results are discussed. For this purpose, oxide slags were synthesized with Al, Si, Ca, and the additives, P and Ti. To this synthetic slag were added the elements, Zr and La (which can be considered proxies for the light REEs), as well as Ta. On the basis of the obtained results, it can be concluded that Ti or P can have strong influences on the phase formation. In the presence of Ti, La, and Ta, predominantly scavenged by perovskite (Ca1-wLa2/3wTi1-(x+y+z)Al4/3xZryTa4/5zO3), and Zr predominantly as zirconate (Ca1-wLa2/3wZr4-(x+y+z)Al4/3xTiyTa4/5zO9), with the P having no effect on this behavior. Without Ti, the Zr and Ta are incorporated into the pyrochlore (La2-xCa3/2x-yZr2+2/4y-zTa4/5zO7), regardless of the presence of phosphorus. In addition to pyrochlore, La accumulates primarily in britholite-type La oxy- or phosphosilicates. Without P and Ti, similar behavior is observed, except that the britholite-like La silicates do not contain P, and the scavenging of La is less efficient. Lithium, on the other hand, forms its own compounds, such as LiAlO2(Si), LiAl5O8, eucryptite, and Li silicate. Additionally, in the presence of P, Li3PO4 is formed, and the eucryptite incorporates P, which indicates an additional P-rich eutectic melt.

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“…Rare earth oxides have a remarkable impact upon the structure and performance in silicate glass systems. Hence, in order to improve some properties of alkali-free aluminoborosilicate glass, rare earth oxides, as network modifiers, are usually regarded as effective additives [7][8][9][10][11][12][13][14][15][16][17]. Gao et al [18] found that the substitution of Y 2 O 3 for Al 2 O 3 showed a strong effect on the structure and properties of alkali-free aluminoborosilicate glasses.…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF REPLACEMENT OF CaO BY La₂O₃ ON THE STRUCTURE, THERMAL AND DIELECTRIC PROPERTIES OF ALKALI-FREE ALUMINOBOROSILICATE GLASSES

Wu¹

2023

Ceramics - Silikaty

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Alkali-free aluminoborosilicate glasses were prepared by the conventional melting method. The effect of the replacement of CaO by La 2 O 3 on the structure, thermal, and dielectric properties of the glasses was investigated by FTIR, DSC, with thermal expansion instruments, and an impedance analyser. With increasing ratios of La 2 O 3 to CaO, the densities of the glasses increased linearly from 2.458 to 2.627 g•cm -3 . Meanwhile, the polymerisation degree of the glass network increased first and then decreased. The glass transition temperature, crystallisation onset temperature and expansion softening temperature showed a gradually increasing trend, while the thermal stability firstly deteriorated, then gradually improved. Additionally, the coefficient of thermal expansion (CTE), dielectric constant and dielectric loss initially decreased, followed by an increase. The sample with the La 2 O 3 /CaO ratio of 1.00 showed excellent properties: had a low CTE (2.71 × 10 -6 °C-1 ), had a dielectric constant (5.23), and a dielectric loss (1.12 × 10 -3 ), which means it is a promising material for integrated circuit packaging applications.

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Liquid Regions of Lanthanum-Bearing Aluminosilicates

Cited by 8 publications

References 38 publications

Optimized preparation of <i>c</i>-axis-aligned polycrystal of doped lanthanum silicate oxyapatite and evaluation of its electrical properties

Optimized preparation of <i>c</i>-axis-aligned polycrystal of doped lanthanum silicate oxyapatite and evaluation of its electrical properties

Influence of P and Ti on Phase Formation at Solidification of Synthetic Slag Containing Li, Zr, La, and Ta

EFFECT OF REPLACEMENT OF CaO BY La₂O₃ ON THE STRUCTURE, THERMAL AND DIELECTRIC PROPERTIES OF ALKALI-FREE ALUMINOBOROSILICATE GLASSES

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