Synthesis of SrMnO<sub>3</sub> powders with different morphologies by hydrothermal method

Zhu, JingSen; Liu, Jingbing; Wang, Hao; Zhu, Ming‐Qiang; Yan, Hui

doi:10.1002/crat.200610807

Cited by 17 publications

(12 citation statements)

References 22 publications

(32 reference statements)

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“…The alkali earth manganates SrMn IV O 3 and BaMn IV O 3 can also be prepared in one step under mild hydrothermal conditions (T o 240 1C). [158][159][160][161] These are again examples of 'hexagonal perovskites', but in this case they have structures constructed from chains of face-shared {MnO 6 } octahedra, Fig. 12b, so are not strictly perovskite materials.…”

Section: Manganitesmentioning

confidence: 99%

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

2010

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In this critical review we consider the large literature that has accumulated in the past 5-10 years concerning solution-mediated crystallisation of complex oxide materials using hydrothermal, or more generally solvothermal, reaction conditions. The aim is to show how the synthesis of dense, mixed-metal oxide materials, usually prepared using the high temperatures associated with solid-chemistry, is perfectly feasible from solution in one step reactions, typically at temperatures as low as 200 °C, and that important families of oxide materials have now been reported to crystallise using such synthetic approaches. We will focus on two common structures seen in oxide chemistry, ABO(3) perovskites and A(2)B(2)O(6)O' pyrochlores, and include a systematic survey of the variety of chemical elements now included in these two prototypical structure types, from transition metals, in families of materials that include titanates, niobates, manganites and ferrites, to main-group elements in stannates, plumbates and bismuthates. The significant advantages of solution-mediated crystallisation are well illustrated by the recent literature: examples are provided of elegant control of crystal form from the nanometre to the micron length scale to give thin films, anisotropic crystal morphologies, or hierarchical structures of materials with properties desirable for many important contemporary applications. In addition, new metastable materials have been reported, not stable once high temperatures and pressures are applied and hence not amenable using conventional synthesis. We critically discuss the possible control offered by solvothermal synthesis from crystal chemistry to crystal form and how the discovery of new materials may be achieved. Computer simulation, combinatorial synthesis approaches and in situ methods to follow crystallisation will be vital in providing the predictability in synthesis that is needed for rational design of new materials (232 references).

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Section: Manganitesmentioning

confidence: 99%

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

2010

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“…Spooren and Walton reported the first successful hydrothermal synthesis of 4H-SrMnO 3 but the resulting morphology was rather heterogeneous ranging from elongated prismatic microcrystals to microparticles. More recently, Zhu et al have shown the influence of the starting materials in the morphology of the SrMnO 3 particles obtained from hydrothermal conditions, forming rhombus-like shaped crystals when KMnO 4 , Mn(CH 3 COO) 2 and Sr(CH 3 COO) 2 were used as starting materials, and rod-like particles when synthesized from KMnO 4 , MnSO 4 and SrSO 4 , but no SrMnO 3 nanoparticles were attained. Moreover, Rizzuti et al obtained blade-shaped particles of 4H-SrMnO 3 by microwave assisted hydrothermal synthesis although still in the microscale.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of 4H-SrMnO_3.0 Nanoparticles from a Molecular Precursor and Their Topotactic Reduction Pathway Identified at Atomic Scale

et al. 2014

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Stoichiometric 4H-SrMnO3.0 nanoparticles have been synthesized from thermal decomposition of a new molecular heterometallic precursor [SrMn(edta)(H2O)5]·3/2H2O whose crystal structure has been solved by single crystal X-ray diffraction. From this precursor, highly homogeneous 4H-SrMnO3.0 nanoparticles, with average particle size of 70 nm, are obtained. The agglomeration of these nanoparticles maintains the sheet-assembling morphology of the metal–organic compound. Local structural information, provided by atomically resolved microscopy techniques, shows that 4H-SrMnO3.0 nanoparticles exhibit the same general structural features as the bulk material, although structural disorder, due to edge dislocations, is observed. The nanometric particle size enables a topotactic reduction process at low temperature stabilizing a metastable 4H-SrMnO2.82 phase. The oxygen deficiency is accommodated through extra cubic layers breaking the ...chch... 4H-sequence. These defect areas are Mn3+ rich, as evidenced by high energy resolution EELS data. Magnetic characterization of nano-SrMnO3.0 shows significant variations with respect to the bulk material. Besides the dominant antiferromagnetic interactions, a weak ferromagnetic contribution as well as exchange bias and a glassy-like component are present. After the reduction process, the stabilization of Mn3+ in the 4H-structure gives rise to magnetic anomalies in the 40–60 K temperature range. The origin of such magnetic features is discussed.

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“…Theoretical and experiment studies have been devoted to studying strontium manganites and cobaltite with the formulas SrMnO 3 and SrCoO 3 during the last several years [1,2]. The SrMnO 3 is known as a G-type antiferromagnetic insulator.…”

Section: Introductionmentioning

confidence: 99%

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples

Khazaei

Malekzadeh²,

Amini

et al. 2010

Cryst. Res. Technol.

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In this study the effects of citric acid concentration, used as organic emulsifier, on the perovskite phase formation of the nano strontium manganite or cobaltite samples were studied. Stoichiometric perovskites in the absence and presence of citric acid were prepared by drying a solution containing molar ratio of Sr(NO 3 ) 2 /Mn(NO 3 ) 2 ·4H 2 O and Sr(NO 3 ) 2 /Co(NO 3 ) 2 ·6H 2 O = 1 followed by calcination at 900 °C for 5 h. Citric acid concentration, selected to be 0.0, 0.3, 0.6, 1.0, 1.3, 2.5 and 5 times of the total number of moles of the nitrate ions. The results revealed that increase in the citric acid concentration, larger than number of moles of the nitrate ions equivalent, deteriorates the perovskite phase formation. Instead, a new phase of carbonates and metal oxides are appeared.

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Synthesis of SrMnO₃ powders with different morphologies by hydrothermal method

Cited by 17 publications

References 22 publications

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

Synthesis of 4H-SrMnO_3.0 Nanoparticles from a Molecular Precursor and Their Topotactic Reduction Pathway Identified at Atomic Scale

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples

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Synthesis of SrMnO3 powders with different morphologies by hydrothermal method

Cited by 17 publications

References 22 publications

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

Solvothermal synthesis of perovskites and pyrochlores: crystallisation of functional oxides under mild conditions

Synthesis of 4H-SrMnO3.0 Nanoparticles from a Molecular Precursor and Their Topotactic Reduction Pathway Identified at Atomic Scale

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO3 and SrCoO3 samples

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Synthesis of SrMnO₃ powders with different morphologies by hydrothermal method

Synthesis of 4H-SrMnO_3.0 Nanoparticles from a Molecular Precursor and Their Topotactic Reduction Pathway Identified at Atomic Scale

Effect of citric acid concentration as emulsifier on perovskite phase formation of nano‐sized SrMnO₃ and SrCoO₃ samples