Bi1-xCaxMnO3 (x = 0.4 and 0.45): X-ray Single-Crystal and Electron Microscopy Study

Giot, M.; Béran, P.; Pérez, Olivier; Malo, Sylvie; Hervieu, M.; Raveau, B.; Nevřiva, M.; Knı́žek, K.; Roussel, Pascal

doi:10.1021/cm060222h

Cited by 18 publications

(23 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The melt was cooled from 1150 °C to 900 °C at a relatively quick rate of 90 °C per hour, whereupon the furnace was turned off and allowed to cool to ambient temperature. Crystals of Bi x Ca y MnO 3 ( x =0.55, y =0.45; x =0.60, y =0.40)51 were successfully grown out of a Bi 2 O 3 flux at 1094 °C, which was slow cooled at 4 °C per hour to room temperature. Large cubic crystals with edges of up to 5 mm were isolated following removal of the flux using hot HNO 3 .…”

Section: Solvent Systemsmentioning

confidence: 99%

Materials Discovery by Flux Crystal Growth: Quaternary and Higher Order Oxides

2012

View full text Add to dashboard Cite

This Review highlights the application of high-temperature solutions for exploratory crystal growth and materials discovery of novel complex oxides. It provides an overview of the method of flux crystal growth of complex oxides and can function as a "how to" guide for those interested in oxide crystal growth. The most commonly used fluxes are discussed in terms of their applicability for dissolving specific elements and the typical reaction conditions are compiled. A large variety of recent quaternary and higher oxides that have been grown as crystals from fluxes are used to illustrate the power of the flux method to grow oxide crystals containing specific elements.

show abstract

Section: Solvent Systemsmentioning

confidence: 99%

Materials Discovery by Flux Crystal Growth: Quaternary and Higher Order Oxides

2012

View full text Add to dashboard Cite

show abstract

“…[23][24][25][26][27][28][29][30][31][32][33][34][35] Fig. 4(a) is a [001] HRTEM image of the CO1 phase.…”

mentioning

confidence: 99%

Microstructure of bilayer manganite PrCa2Mn2O7 showing charge/orbital ordering

Tian

Deng

et al. 2013

Applied Physics Letters

View full text Add to dashboard Cite

The microstructure of the charge/orbital ordering Ruddleden-Popper phase PrCa 2 Mn 2 O 7 was studied by transmission electron microscopy along both the [001] and the [110] orientation. Three coexisting charge/orbital ordering phases CO1, CO2, and CO3 were observed along the [001] orientation at room temperature. Different from the one-dimensional modulation in the CO1 and CO2 phase, the CO3 phase is characterized by two sets of mutually perpendicular structural modulations. From [110] high angle annular dark field-scanning transmission electron microscopy, we found that the Pr atoms locate in-between the bilayer MnO 6 octahedra, which is different from the previous reports. The strongly correlated electronic systems of perovskite manganites have received great attention because of their fascinating physical properties such as colossal magnetoresistance and high spin polarity, which could find potential applications in spintronics or magnetic tunnel junction. [1][2][3][4][5][6][7][8][9] The physical mechanism of these properties was ascribed to the complicated interplays between the four degrees of freedom of lattice, charge, orbital, and spin, and the consequent ordering as well as possible phase separation. 6,[10][11][12] Recently, two distinct charge/orbital ordering (CO/OO) states were found in the Ruddlesden-Popper (RP) compound Pr(Sr 1Àx Ca x ) 2 Mn 2 O 7 . 13 Pr(Sr 1Àx Ca x ) 2 Mn 2 O 7 has a layer structure (AO) (ABO 3 ) n (n ¼ 2), where two (ABO 3 ) perovskite layers are separated by a AO rock salt layer along the long axis. The two reported CO/OO phases in Pr(Sr 0.1 Ca 0.9 ) 2 Mn 2 O 7 are the high-temperature phase CO1 phase at 330 K > T > 295 K (lattice parameters a ¼ 0.5412, b ¼ 1.0921, c ¼ 1.9234 nm, and space group Pbnm) and the lower-temperature CO2 phase at T < 295 K (a ¼ 1.0812, b ¼ 0.5475, c ¼ 1.9203 nm, and space group Am2m, Ref. 13). The CO1 phase is centrosymmetric without any spontaneous electric polarization, but the CO2 phase is a noncentrosymmetric phase with spontaneous electric polarization. 13 The thermally induced rotation of orbital stripes between these two ordering phases has attracted extensive interest. [14][15][16][17][18] However, the limited information about its microstructures has obstructed a better understanding of the macro properties and physics underneath. Therefore, we carried out a transmission electron microscopy (TEM) study on PrCa 2 Mn 2 O 7 to reveal the different aspects of the microstructure. The phases and micro domains viewed along the [001] zone axis are discussed. The heavy Pr atoms were found to locate inbetween the bilayer MnO 6 octahedra.Bulk PrCa 2 Mn 2 O 7 samples were synthesized using a traveling solvent floating zone method with high oxygen background pressure. 17,18 Powdered samples, deposited on a Cu grid coated with a holey carbon film, as well as Ar-ion milled TEM samples were used for TEM investigation. A Tecnai G 2 electron microscope equipped with a Gatan cooling and heating holder operated at 200 kV was used to record electron diffractio...

show abstract

“…Die Schmelze wurde mit einer relativ großen Geschwindigkeit von 90 °C pro Stunde von 1150 °C auf 900 °C abgekühlt, worauf der Ofen ausgeschaltet wurde und bis auf Raumtemperatur abkühlte. Kristalle von Bi x Ca y MnO 3 ( x =0.55, y =0.45; x =0.60, y =0.40)51 wurden bei 1094 °C in einem Bi 2 O 3 ‐Fluss gezüchtet, der mit 4 °C pro Stunde langsam auf Raumtemperatur abgekühlt wurde. Nach Entfernen des Flussmittels mit heißer HNO 3 wurden große kubische Kristalle mit einer Kantenlänge von bis zu 5 mm isoliert.…”

Section: Lösungsmittelsystemeunclassified

Auf der Suche nach neuen Materialien: Kristallzucht von quaternären und höherwertigen Oxiden in Flussmitteln

Bugaris

Loye

2012

Angewandte Chemie

View full text Add to dashboard Cite

Dieser Aufsatz behandelt die explorative Kristallzucht in Hochtemperaturlösungen als eine Methode zur Entdeckung von komplexen Oxidmaterialien. Er gibt eine Übersicht über das Verfahren der Kristallzucht in der Schmelze (Flux‐ oder Flussmittelzüchtung) und kann als Leitfaden für die Anwendung dieser Technik dienen. Die am häufigsten eingesetzten Schmelzen werden hinsichtlich ihres Lösungsvermögens für spezifische Elemente diskutiert, und typische Reaktionsbedingungen werden zusammengestellt. Um das Leistungsvermögen der Fluxmethode zu demonstrieren, werden verschiedene kürzlich hergestellte quaternäre und höhere Oxide vorgestellt, die für das Züchten von Oxidkristallen aus spezifischen Elementen geeignet sind.

show abstract

Bi_1-_xCa_xMnO₃ (x = 0.4 and 0.45): X-ray Single-Crystal and Electron Microscopy Study

Cited by 18 publications

References 37 publications

Materials Discovery by Flux Crystal Growth: Quaternary and Higher Order Oxides

Materials Discovery by Flux Crystal Growth: Quaternary and Higher Order Oxides

Microstructure of bilayer manganite PrCa2Mn2O7 showing charge/orbital ordering

Auf der Suche nach neuen Materialien: Kristallzucht von quaternären und höherwertigen Oxiden in Flussmitteln

Contact Info

Product

Resources

About