Solubility study of the halite and wurtzite solid solutions in the MgO-ZnO system within temperature range from 1000 to 1600 °C

Xia, Longgong; Liu, Zhihong; Taskinen, Pekka

doi:10.1016/j.jallcom.2016.06.191

Cited by 13 publications

(10 citation statements)

References 15 publications

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“…The sensitivity dX Zn /dT , where X Zn is the mole fraction of ZnO, is in the order of 0.03/100 • C for rock salt but much less in wurtzite. At high temperatures, experiments in sealed capsules gave slightly greater Zn concentrations in rock salt (by ∼ 0.01 in X Zn ) than experiments in unsealed capsules and the results reported in Xia et al (2016), highlighting the importance of Zn volatilization at high temperatures (Fig. 2).…”

Section: Resultsmentioning

confidence: 54%

“…% vs. 2 mol. % at 1000 • C) than the results of Xia et al (2016) from unfluxed experiments, demonstrating the necessity of using a flux to obtain equilibrium in lowtemperature experiments at atmospheric pressure.…”

Section: Resultsmentioning

confidence: 88%

“…The temperature at which x 2 / m Zn reaches the suggested threshold of 100 µm 2 % −1 is then calculated to be 1556 K. At substantially higher temperatures, re-equilibration may not keep up with Zn loss, unless something is done to reduce the latter. Support for this inference comes from the time-series experiments of Xia et al (2016), who found that coexisting rock salt and wurtzite compositions stabilized within 20 h at 1100 • C, but at 1500 • C, X Zn in the rock salt phase continued to decrease through to their longest observation of 20 h.…”

Section: Experimental Starting Materialsmentioning

confidence: 98%

“…In the T -X plane (Fig. 1), the mutual solubility narrows with increasing temperature (Rigamonti, 1946;Sarver et al, 1959;Kondrashev and Omelchenko, 1964;Segnit and Holland, 1965;Hansson et al, 2004;Xia et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

Farmer,

O'Neill

2023

Eur. J. Mineral.

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Abstract. At ambient pressure, MgO crystallizes in the rock salt (B1) structure, whereas ZnO crystallizes in the wurtzite structure (B4). The asymmetric miscibility gap between these two structures in the MgO–ZnO binary system narrows with increasing pressure, terminating at the wurtzite-to-rock-salt phase transition in pure ZnO, which occurs at approximately 5 GPa at 1000 ∘C. Despite their essential simplicity, the pressure–temperature–composition (P–T–X) relations in the MgO–ZnO binary system have been sparsely studied experimentally, with disparate results that are inconsistent with available thermodynamic data. Here we report the experimental determination of the P–T–X relations of the miscibility gap from 940 to 1500 ∘C and 0 to 3.5 GPa, which we combine with calorimetric and equation-of-state data from the literature and on the transition in endmember ZnO, to build a thermodynamic model that resolves many of the inconsistencies. The model treats the rock salt phase as an ideal solution (no excess Gibbs free energy of mixing), while in the wurtzite phase the MgO component follows Henry's law and the ZnO component Raoult's law in the range of compositions accessed experimentally. However, there is an inconsistency between the partial molar volume of wurtzite-structured MgO deduced from this model and that inferred from lattice parameter measurements by X-ray diffraction in the quenched samples. This discrepancy may be caused by unquenchable disordering of some significant fraction of the substituting Mg2+ into normally vacant octahedral interstices of the wurtzite structure.

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Section: Resultsmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 88%

Section: Experimental Starting Materialsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

Farmer,

O'Neill

2023

Eur. J. Mineral.

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“…Theoretically, Mg 2þ ions can rapidly enter the ZnO lattice to replace Zn 2þ ions without forming the MgO phase under extreme conditions of high energy and high pressure. [10,[19][20][21][22] The Mg x Zn 1Àx O films were obtained by the laser thermal treatment process instead of the annealing process in a muffle furnace. The laser thermal treatment process is metastable, and the Mg x Zn 1-x O films with high Mg 2þ components are easily obtained under the action of high temperature and high pressure.…”

Section: Introductionmentioning

confidence: 99%

Laser Thermal Treatment‐Induced Mg_xZn_1−xO Gradient Film and Photodetector with Solar‐Blind UV Response

Wang

Liu

et al. 2022

Physica Status Solidi (a)

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Mg x Zn1−x O is a ternary oxide semiconductor, which has an important application prospect in solar‐blind UV detection fields. Herein, Mg x Zn1−x O gradient film is realized utilizing the sol–gel method and laser thermal treatment process. X‐ray diffraction (XRD) pattern and absorption curve show that the gradient film has a single (002) crystal orientation and a single absorption edge. Field‐emission scanning electron microscope and energy‐dispersive spectroscopy characterization and finite‐element analysis simulation prove that the laser thermal treatment temperature on the gradient film decreases from 1100 to 600 °C, corresponding to the Mg2+ component gradually increasing from 35% to 54% and the bandgap broadening from 3.75 to 5.08 eV. Metal–semiconductor–metal‐structured photodetectors (PDs) are fabricated based on the gradient film. The high responsivity is attributed to the capture and the prolonged lifetime of photogenerated holes. Herein, an idea for the preparation of gradient film and the development of UVC and UVA multiband PDs is provided.

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Strain Fluctuations Unlock Ferroelectricity in Wurtzites

Baksa,

Gelin,

Oturak

et al. 2024

Adv Elect Materials

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Ferroelectrics are of practical interest for non‐volatile data storage due to their reorientable, crystallographically defined polarization. Yet efforts to integrate conventional ferroelectrics into ultrathin memories have been frustrated by film‐thickness limitations, which impede polarization reversal under low applied voltage. Wurtzite materials, including magnesium‐substituted zinc oxide (Zn,Mg)O, have been shown to exhibit scalable ferroelectricity as thin films. In this work, the origins of ferroelectricity in (Zn,Mg)O are explained, showing that large strain fluctuations emerge locally in (Zn,Mg)O and can reduce local barriers to ferroelectric switching by more than 40%. Concurrent experimental and computational evidence of these effects are provided by demonstrating polarization switching in ZnO/(Zn,Mg)O/ZnO heterostructures featuring built‐in interfacial strain gradients. These results open up an avenue to develop scalable ferroelectrics by controlling strain fluctuations atomistically.

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Solubility study of the halite and wurtzite solid solutions in the MgO-ZnO system within temperature range from 1000 to 1600 °C

Cited by 13 publications

References 15 publications

The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

Laser Thermal Treatment‐Induced Mg_xZn_1−xO Gradient Film and Photodetector with Solar‐Blind UV Response

Strain Fluctuations Unlock Ferroelectricity in Wurtzites

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Solubility study of the halite and wurtzite solid solutions in the MgO-ZnO system within temperature range from 1000 to 1600 °C

Cited by 13 publications

References 15 publications

The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

The miscibility gap between the rock salt and wurtzite phases in the MgO–ZnO binary system to 3.5 GPa

Laser Thermal Treatment‐Induced MgxZn1−xO Gradient Film and Photodetector with Solar‐Blind UV Response

Strain Fluctuations Unlock Ferroelectricity in Wurtzites

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Product

Resources

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Laser Thermal Treatment‐Induced Mg_xZn_1−xO Gradient Film and Photodetector with Solar‐Blind UV Response