Formation of MgZnO alloy under thermodynamic conditions

Маркевич, И. В.; Stara, T.; Kuchuk, Andrian; Polishchuk, Yu.; Kladko, V. P.

doi:10.1016/j.physb.2014.05.012

Cited by 7 publications

(9 citation statements)

References 25 publications

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“…The revealed peak shifts indicate formation of ZnMgO solid solutions of hexagonal and cubic crystalline structures. In fact, we have shown earlier that formation of cubic and hexagonal ZnMgO phases occurs side by side during sintering of ZnMgO ceramics. The concentrations of the hexagonal ZnO‐like and cubic MgO‐like crystal phases evaluated by Reference Intensity Ratio method were found to be, respectively, 94 and 6% in the films annealed at temperatures in the range of 800–1000 °C and 96 and 4% in the films annealed at lower temperatures.…”

Section: Resultsmentioning

confidence: 80%

“…The phase diagram of ZnO‐MgO binary system predicted a pure wurtzite Zn 1‐x Mg x O alloy with Mg content up to about 4% . The solubility limit of Mg in hexagonal Zn 1‐x Mg x O alloy produced under thermodynamic conditions has been shown to be about 20%, although formation of the hexagonal and cubic ZnMgO phases occurs simultaneously . In the films grown under metastable conditions, pure wurtzite Zn 0.6 Mg 0.4 O phase has been reported .…”

Section: Introductionmentioning

confidence: 99%

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The Effect of High Temperature Annealing on the Photoluminescence of ZnMgO Alloys

Borkovska

Khomenkova

Маркевич

et al. 2018

Physica Status Solidi (a)

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The effect of thermal annealing on the luminescence of wurtzite ZnMgO alloys in the films and ceramics produced by solid state reaction route is investigated. Formation of hexagonal ZnMgO phase is proved by X‐ray diffraction, micro‐Raman, photoluminescence (PL), and PL excitation methods. Mg starts incorporating into ZnO lattice at 700 °C, and its content increases with the increase of the annealing temperature up to 1000 °C. Nevertheless, in the PL spectra of the films annealed in air at 1000 °C, excitonic and defect‐related emissions from residual ZnO phase dominate, while those from the ZnMgO alloy are weak. The annealing in Zn vapor results in even weaker ZnMgO PL. In ceramics sintered in the air at 1000 °C, the PL from wurtzite ZnMgO phase is found to be strongly supressed on the surface and bright in the depth of a pellet. The gettering of Na, K, and Ca residual impurities at the surface of the samples under annealing is proved by Secondary ion mass spectrometry. It is proposed that degradation of ZnMgO PL in the near surface region is caused mainly by intense thermal decomposition of wurtzite ZnMgO phase accompanied by generation of non‐radiative defects.

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Section: Resultsmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

The Effect of High Temperature Annealing on the Photoluminescence of ZnMgO Alloys

Borkovska

Khomenkova

Маркевич

et al. 2018

Physica Status Solidi (a)

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“…In this case, the samples were located in a closed crucible with metallic zinc scraps and annealed in N 2 flow. In all cases, firm and dense hexagonal phase ceramics were obtained (X-ray diffraction patterns were shown in [13]). Prepared samples were cut transversally and defect-related PL spectra in 400-800 nm range as well as PL excitation (PLE) spectra in 250-400 nm range were measured from cleft surface at room temperature.…”

Section: Methodsmentioning

confidence: 96%

“…The Mg content x was changed from 0 up to 0.20, which was found to be the solubility limit of Mg in hexagonal-structure Mg x Zn 1-x O ceramics [13]. After drying at room temperature, the samples were sintered in air at 1050 °C for 3 hours and cooled with the furnace.…”

Section: Methodsmentioning

confidence: 99%

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Influence of Mg content on defect-related luminescence of undoped and doped wurtzite MgZnO ceramics

Маркевич¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Undoped as well as Li-, Ag-, Cu-and Zn-doped Mg x Zn 1-x O ceramics with x = 0-0.20 were sintered at 1000 °C. Defect-related photoluminescence (PL) and PL excitation spectra were measured at room temperature in 400-800 nm and 250-400 nm spectral ranges, accordingly. Two types of PL bands were observed: i) the bands, spectral positions of which were not influenced by the Mg content (Cu-related as well as selfactivated orange and red ones); ii) the bands, spectral positions of which exhibited some blueshift with increasing Mg content (Li-and Ag-related and self-activated green ones). It has been shown that used doping gives the possibility to obtain the phosphor with intense visible emission within the blue-yellow spectral range.

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Ultra‐Sensitive Bulk Piezophotovoltaic Effect in NaBa(P,Bi) Alloy Under Topological Phase Transition

Jiang,

Kang,

et al. 2024

Adv Funct Materials

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The bulk photovoltaic effect, with ultra‐sensitive control under ambient piezo response, plays a significant role in many modern optoelectronic applications. However, functional bulk photovoltaic materials with high piezo sensitivity are rare, and discovering them is a great challenge. This article proposes a practical design scheme to achieve an ultra‐sensitive bulk piezophotovoltaic effect (BPPVE) in a single‐valley topological alloy material system. The BPPVE is accomplished by reversing the giant shift current in an alloy material that exhibits piezo‐sensitive topological band inversion, as predicted in the acentric single‐valley NaBa(P,Bi) alloy system. First‐principles calculations confirm that the shift current in NaBaP1‐xBix has high directional and magnitude sensitivity (−5000 to 400 µA V−2) in a rather low‐stress region (<0.5 GPa) near the critical alloy concentration (x ∼ 0.48), along with a remarkable topological phase transition. Notably, the stress‐induced bulk photovoltaic effect in NaBa(P,Bi) is much more sensitive than in other existing bulk photovoltaic materials. The outcomes demonstrate an outstanding BPPVE with ultra‐high piezo sensitivity for the first time in topological alloy systems.

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Formation of MgZnO alloy under thermodynamic conditions

Cited by 7 publications

References 25 publications

The Effect of High Temperature Annealing on the Photoluminescence of ZnMgO Alloys

The Effect of High Temperature Annealing on the Photoluminescence of ZnMgO Alloys

Influence of Mg content on defect-related luminescence of undoped and doped wurtzite MgZnO ceramics

Ultra‐Sensitive Bulk Piezophotovoltaic Effect in NaBa(P,Bi) Alloy Under Topological Phase Transition

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