Thermodynamic Investigation of the Hydrolysis Behavior of Fluorozirconate Complexes at 423.15–773.15 K and 100 MPa

Yan, Haibo; He, Junjie; Liu, Xiaowen; Wang, Hongbo; Liu, Junfeng; Ding, Xing

doi:10.1007/s10953-020-00993-1

Cited by 9 publications

(9 citation statements)

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“…In addition to the crystal form of synthesized products, temperature also has an important effect on the hydrolytic reaction's degree and morphology of hydrolytic products [32,[34][35][36]40]. In this study, as the temperature increases, the morphology of synthesized zirconia also varied.…”

Section: Resultsmentioning

confidence: 92%

“…The above reaction generally reached an equilibrium of hydrolysis within a few hours at 200 • C and 100 MPa, producing zirconia crystals and hydrogen fluoride, and demonstrated a strong dependence on temperature and initial solution concentration [33,36]. To avoid the effect of runtime for synthesis products, all synthesis experiments were conducted with a longer duration (12-14 h).…”

Section: Resultsmentioning

confidence: 99%

“…The influence of temperature on the morphology of synthesized zirconia could be explained by the process of hydrolytic reaction. As the temperature increases, the degree of hydrolytic reaction will increase, resulting in Equation (1) moving to the right and forming more precipitates and HF [36]. Hence, a large amount of ZrO 2 precipitated from the solution can facilitate zirconia's growth, resulting in an increase of zirconia in size.…”

Section: Resultsmentioning

confidence: 99%

“…It is connected with a high-precision high-pressure gauge (±5 MPa) measured with a NiCr-Ni thermocouple (±5 • C) [32][33][34]. A constant temperature drying oven (±1 • C, DGG-9070B, Jiangdong) was used for the post-processing of synthetic products [35,36]. All synthesis processes were conducted at the hydrothermal laboratory of the Guangzhou Institute of Geochemistry, China.…”

Section: Reagents and Instrumentsmentioning

confidence: 99%

“…This could also be explained by the degree of the hydrolytic reaction of H 2 ZrF 6 . With the concentration of the initial H 2 ZrF 6 solution increasing, Equation (1) will move to the right and form a large amount of precipitates and HF, resulting in the growth and aggregation of the synthesized zirconia micro-nanoflake with high (001) facets [34,36].…”

Section: Effect Of Initial Solutions' Concentration On the Morphology...mentioning

confidence: 99%

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Synthesis of Zirconia Micro-Nanoflakes with Highly Exposed (001) Facets and Their Crystal Growth

Yan

et al. 2021

Crystals

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This study reports a novel preparation method of zirconia micro-nanoflakes with high (001) facets that is generated through a hydrolysis reaction of the fluozirconic acid (H2ZrF6). Zirconia micro-nanoflakes synthesized at varied conditions were analyzed by the SEM, EDS, μ-XRD, and Raman spectroscopy to characterize the morphology and probe into the crystal growth mechanism. The synthesized zirconia crystals in the form of elliptical micro-nanoflakes or irregular nanoflakes generally display the highly exposed (001) facets with a thickness of 1–100 nm and a length of 0.1–2.0 μm. As the temperature and initial solution concentration increased, the particle sizes of the synthesized zirconia micro-nanoflakes became more uniform and the thicknesses of the (001) facets became larger, suggesting that the synthesized zirconia crystals grow along the (001) facets and mostly along the c-axis direction. This is confirmed by the data from the μ-XRD patterns. The results also demonstrate that an oriented attachment-based growth occurring in a fluorine-rich solution environment was involved in the aggregation and coarsening of zirconia micro-nanoflakes. Meanwhile, synthesized zirconia micro-nanoflakes also evolved from a mixture of monoclinic and tetragonal systems to a pure monoclinic system (i.e., baddeleyite) with the temperature increasing, suggesting a key role of temperature regarding zirconia’s growth.

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