Density and hardness of Nd-doped zircon ceramics as nuclear waste forms

Yuan, Xun; Li, Xudong; Wang, Lan; Lu, Xirui

doi:10.1088/1755-1315/61/1/012140

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…3(b) and 3(h), respectively [17][18][19]. The result from our study is consistent with Yuan et al [20], which reported the increase in hardness with increasing density. The temperature dependences of the dielectric constant and dielectric loss of the BCT-NBT ceramics at various sintering temperatures with 1 kHz frequency at Curie temperature and room temperature were studied as shown in Table 2 and plotted in Fig.…”

Section: Resultssupporting

confidence: 92%

“…This result confirmed that the improvement in the Vickers and Knoop micro-hardness could be related to the change in fracture mode from partial intra-granular to mainly intra-granular as shown in Fig.3(b) and 3(h), respectively[17][18][19]. The result from our study is consistent with Yuan et al[20], which reported the increase in hardness with increasing density.…”

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confidence: 92%

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Physical, Dielectric Properties and Micro-Hardness of the (Ba0.90Ca0.10)0.90(Na0.50Bi0.50)0.10TiO3 Ceramics Prepared by Molten Salt Method

Warangkanagool

2018

SSP

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In this study, the physical properties, dielectric properties, and micro-hardness of (Ba0.90Ca0.10)0.90(Na0.50Bi0.50)0.10TiO3 or BCT-NBT ceramics prepared by molten salt method with various sintering temperatures were investigated. The powders were calcined at 500-1100°C for 4 h with heating rate of 5°C/min. It was found that the optimum calcination condition was 1000°C for 4 h. These powders were pressed and sintered at 1200-1400°C for 3 h with a heating rate of 5°C/min. The microstructure was examined by scanning electron microscope (SEM). The density of the sintered samples was measured by Archimedes method with distilled water as the fluid medium. Dielectric properties were examined by LCR meter. The micro-hardness of the BCT-NBT ceramics was determined using the Vickers and Knoop indentation techniques. The results showed that the average grain sizes increased with increasing sintering temperatures. At sintering temperatures higher than 1200°C, the fracture mode changed from partial intra-granular to mainly intra-granular. The sintering temperature at which the density, dielectric and hardness properties were maximal was 1350°C. The highest density was about 5.4 g/cm3, and the Vickers and Knoop micro-hardnesses were 6.6 and 6.4 GPa, respectively. The dielectric constant at the Curie temperature was 3682 and the dielectric loss was 0.01 at 1 kHz frequency.

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Section: Resultssupporting

confidence: 92%

supporting

confidence: 92%

Physical, Dielectric Properties and Micro-Hardness of the (Ba0.90Ca0.10)0.90(Na0.50Bi0.50)0.10TiO3 Ceramics Prepared by Molten Salt Method

Warangkanagool

2018

SSP

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“…3 Data reported in Smedskjaer et al (2008). 4 Data reported in Yuan et al (2017) 5 Data reported in Dekker and Rieck (1974). The reported data are averaged from the applied load at [110] and [100].…”

Section: Code Availabilitymentioning

confidence: 99%

The relaxation of residual inclusion pressure and implications to Raman-thermobarometry

Zhong

Moulas

Tajčmanová

2019

Preprint

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Abstract. Residual pressure can be preserved in mineral inclusions, e.g. quartz-in-garnet, after exhumation due to differential expansion between inclusion and host crystals. Raman spectroscopy has been applied to infer the residual pressure and provides information on the entrapment temperature and pressure conditions. However, the amount of residual pressure relaxation cannot be directly measured. An underestimation of pressure relaxation may lead to significant errors between calculated and actual entrapment pressure. This study focuses on three mechanisms responsible for the residual-pressure relaxation: 1) viscous creep; 2) plastic yield; 3) proximity of inclusion to thin-section surface. Criteria are provided to quantify how much of the expected residual pressure is relaxed due to these three mechanisms. An analytical solution is introduced to demonstrate the effect of inclusion depth on the residual pressure field when the inclusion is close to thin-section surface. It is shown that for quartz-in-garnet system, the distance between thin-section surface and inclusion centre needs to be at least two times the inclusion radius to avoid pressure relaxation. In terms of viscous creep, representative case studies on quartz-in-garnet system show that viscous relaxation may occur from temperatures as low as 600∼700 °C depending on the particular P-T path and various garnet compositions. For quartz entrapped along the prograde P-T path and subject to viscous resetting at peak T above 600∼700 °C, its residual pressure after exhumation may be higher than predicted from its true entrapment conditions. Moreover, such a viscous resetting effect may introduce apparent overstepping of garnet nucleation that is not related to reaction affinity.

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Highly efficient preparation of 0.2ZrO2/ZrSiO4 bulk ceramics with high density and hardness by molten-salt method and hot-pressing sintering

Zhao,

Chen,

Guo

et al. 2024

Ceramics International

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Density and hardness of Nd-doped zircon ceramics as nuclear waste forms

Cited by 5 publications

References 18 publications

Physical, Dielectric Properties and Micro-Hardness of the (Ba<sub>0.90</sub>Ca<sub>0.10</sub>)<sub>0.90</sub>(Na<sub>0.50</sub>Bi<sub>0.50</sub>)<sub>0.10</sub>TiO<sub>3</sub> Ceramics Prepared by Molten Salt Method

Physical, Dielectric Properties and Micro-Hardness of the (Ba<sub>0.90</sub>Ca<sub>0.10</sub>)<sub>0.90</sub>(Na<sub>0.50</sub>Bi<sub>0.50</sub>)<sub>0.10</sub>TiO<sub>3</sub> Ceramics Prepared by Molten Salt Method

The relaxation of residual inclusion pressure and implications to Raman-thermobarometry

Highly efficient preparation of 0.2ZrO2/ZrSiO4 bulk ceramics with high density and hardness by molten-salt method and hot-pressing sintering

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