Thermochromism in (Ba,Sr)-Mn oxides

Heiras, J.; Pichardo, E.; Mahmood, Arshad; López, T.; Pérez‐Salas, R.; Siqueiros, J. M.; Blanco, O.; Castellanos, M.

doi:10.1016/s0022-3697(01)00198-6

Cited by 32 publications

(12 citation statements)

References 14 publications

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“…The SrMnO 3 is known as a G-type antiferromagnetic insulator. The properties of the SrMnO 3 sample such as oxygen nonstoichiometry, electronic properties, thermochromism and the others are attributed to the configuration of the skeletal structure that is consisted of a three dimensional network of MnO 6 octahedra [3][4][5]. The conventional solid state reaction method which has been mainly used for preparation of SrMnO 3 manganite needs a temperature about 1400 °C.…”

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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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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“…% of PVA was pressed into discs and then sintered at 1350-1375°C for 3 hours. (d) Also preparation of (Ba, Sr)-Mn oxides (Heiras et al, 2002): BaCO3, SrCO3 and Mn2O3 in appropriate atomic ratios were mixed, ground and calcined at 850°C for 24h following two steps at 350 and 650°C for 3 hours each. The calcined powder was reground and pressed into 1 cm diameter pellets at a pressure of 650Kg/cm 2 .…”

Section: Examples Of Solid State Reactionsmentioning

confidence: 99%

Soft Chemistry Routes to New Nanosize Materials

Melghit

2007

SQU Journal for Science

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The old classical method for preparing inorganic materials is by the ceramic route or solid state reaction. It consists of mixing the starting materials at an elevated temperature. This method has been used for preparing numerous new materials until today. Three decades ago, the materials science community was aware of soft chemistry synthesis or chimie douce, especially with the emergence of nanotechnology field. Instead of the classical method, which involves high temperature, soft chemistry techniques use lower temperatures. In general, starting materials are dissolved in a liquid phase and different parameters such as pH, temperature and reaction time are adjusted in order to obtain the desired product. By using a lower temperature of preparation, the product obtained shows nanosize particles, with sizes lower than 100 nanometers. In contrast, the ceramic route (or solid state reaction) using higher temperatures leads to bigger particles size that are out of the nanosize range. Also, some interesting phases that are not stable at elevated temperatures (named metastable phases) and are not accessible by the classical method, are now prepared by the soft chemistry technique. Usually these metastable phases have interesting structural features and important physical properties. Adding to that, the product is obtained with a higher level of purity.

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“…Due to the special skeletal structure which was consisted of a three dimensional network of MnO 6 octahedra, the SrMnO 3 sample has some properties such as oxygen nonstoichiometry, electronic properties, thermochromism, etc [15]. SrMnO 3 powders have been synthesized with many methods such as high temperature solid-state reaction, coprecipitation [16], sol-gel, etc [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Characterization of Hexagonal SrMnO₃Nanofibers by Electrospinning

Zhu

Zhong

2016

MATEC Web Conf.

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Abstract.SrMnO 3 /Polyvinylpyrrolidone (PVP) composite nanofibers have been prepared successfully by electrospinning from Cerous(II) nitrate and Manganese(II) acetate tetrahydrate, after the heat treatment at 800 o C for 3 h, the hexagonal SrMnO 3 nanofibers was obtained. The effect of PVP concentration was investigated. The size and morphology, phase information, thermal properties of nanofibers were characterized by SEM, EDX, XRD, TGA, FT-IR, respectively.

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Thermochromism in (Ba,Sr)-Mn oxides

Cited by 32 publications

References 14 publications

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

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

Soft Chemistry Routes to New Nanosize Materials

Fabrication and Characterization of Hexagonal SrMnO₃Nanofibers by Electrospinning

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Thermochromism in (Ba,Sr)-Mn oxides

Cited by 32 publications

References 14 publications

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

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

Soft Chemistry Routes to New Nanosize Materials

Fabrication and Characterization of Hexagonal SrMnO3Nanofibers by Electrospinning

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Product

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

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

Fabrication and Characterization of Hexagonal SrMnO₃Nanofibers by Electrospinning