Structural stability of multiferroics BiMnO3 under high pressure

H., Z.; You, Shujie; Yang, Lihong; Chen, L. C.; Chen, Jin; Wang, X. H.; Chen, R. Z.; Li, L. T.; Li, Y. C.; Li, X. D.; Liu, Jing

doi:10.1007/s10832-007-9306-0

Cited by 10 publications

(11 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a previous paper, Chi et al have shown that the crystal structure of BiMnO 3 is unchanged even under a pressure of 260 kbar at room temperature. 23 So, under the small pressure of our measurement (p max ∼ 16 kbar) compared that of Chi et al, we should not expect any structural phase transition in our sample. Therefore, this scenario can be discarded.…”

contrasting

confidence: 44%

“…the strain effect on film is anisotropic), leading to a constant value of the Mn-O-Mn bond angle. Chi's report shows that the pressure-dependent compression of different lattice constants is anisotropic, 23 which will distort the lattice and change the value of each Mn-O-Mn bond angle.…”

mentioning

confidence: 99%

“…A simple quantitative calculation has been performed based on Chi's reported lattice constants. 23 We assume that the structure parameters (x, y, z) 12 are unchanged at low temperature and high pressure, and calculate the bond angles of different Mn-O-Mn pathways at ambient pressure and at 260 kbar. The results are shown in Table I.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Anomalous pressure effect on the magnetic ordering in multiferroic BiMnO3

Chou,

Taran,

Her

et al. 2010

Preprint

View full text Add to dashboard Cite

We report the magnetic field dependent dc magnetization and the pressure-dependent (pmax ∼ 16 kbar) ac susceptibilities χp(T ) on both powder and bulk multiferroic BiMnO3 samples, synthesized in different batches under high pressure. A clear ferromagnetic (FM) transition is observed at TC ∼ 100 K, and increases with magnetic field. The magnetic hysteresis behavior is similar to that of a soft ferromagnet. Ac susceptibility data indicate that both the FM peak and its temperature (TC) decrease simultaneously with increasing pressure. Interestingly, above a certain pressure (9 ∼ 11 kbar), another peak appears at Tp ∼ 93 K, which also decreases with increasing pressure, with both these peaks persisting over some intermediate pressure range (9 ∼ 13 kbar). The FM peak disappears with further application of pressure; however, the second peak survives until present pressure limit (pmax ∼ 16 kbar). These features are considered to originate from the complex interplay of the magnetic and orbital structure of BiMnO3 being affected by pressure.

show abstract

contrasting

confidence: 44%

mentioning

confidence: 99%

See 1 more Smart Citation

Anomalous pressure effect on the magnetic ordering in multiferroic BiMnO3

Chou,

Taran,

Her

et al. 2010

Preprint

View full text Add to dashboard Cite

show abstract

“…23 The use of high-pressure and high-temperature synthesis conditions favors stabilization of monoclinic phases in perovskite oxides. 16,24,25 In this work, we report on the synthesis of LaGdO 3 in a pure single monoclinic phase via a modified sol−gel Pechini method and its structural characterization by means of X-ray diffraction (XRD) and Raman spectroscopy. Additionally, we investigate the effect of Er 3+ and Er 3+ /Yb 3+ doping on the crystal structure and their Er 3+ photoluminescence (PL) properties, in particular, those related to the optimum doping concentration for temperature sensing.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In LaREO 3 , the radius difference between La 3+ and other RE ions provides t values far from 1 and all compounds show an orthorhombic structure with the exception of the monoclinic LaDyO 3 . The use of high-pressure and high-temperature synthesis conditions favors stabilization of monoclinic phases in perovskite oxides. ,, …”

Section: Introductionmentioning

confidence: 99%

Upconversion and Optical Nanothermometry in LaGdO₃: Er³⁺ Nanocrystals in the RT to 900 K Range

et al. 2019

View full text Add to dashboard Cite

The search for material hosts being able to incorporate Er 3+ impurities with a thermally stable structure and a high melting temperature is priority in optical thermometry. In this work, we report on the structural and spectroscopic characterization of Er 3+ -doped and Yb 3+ /Er 3+codoped LaGdO 3 nanocrystals synthesized via the sol−gel Pechini method. X-ray diffraction and Raman spectroscopy unequivocally show that the synthesis method provides nanocrystals with a single-phase B-type monoclinic structure (space group, C2/m). Intensity decay curves, I(t), were measured to investigate the efficiency of upconversion processes yielding green emission. We showed that an energy transfer upconversion (ETU) process involving Yb−Er pairs governs visible emission upon near-infrared (NIR) excitation. The temperature dependence of the thermalized green luminescence at 525 nm ( 2 H 11/2 → 4 I 15/2 ) and 549 nm ( 4 S 3/2 → 4 I 15/2 ) was checked for thermometric applications in the room temperature (RT) to 900 K range. We demonstrate that the B-type monoclinic phase of LaGdO 3 is stable from low temperatures up to 900 K. Doped with Er 3+ , it shows suitable thermometer capabilities with a maximum sensitivity of S = 4.3 × 10 −3 K −1 at 554 K and a relative sensitivity decreasing from its maximum value at 0 K to S R = 1.2 × 10 −2 K −1 at 298 K. The results suggest that LaGdO 3 in its B-type monoclinic phase is a promising material as a wide-range temperature sensor, without any further surface protection.

show abstract