Structural changes in irradiated BeO

Yakel, H. L.; Borie, A.

doi:10.1107/s0365110x63001584

Cited by 35 publications

(8 citation statements)

References 4 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First, study of magnetic ordering on the Mn 3+ ions is more straightforward in YMnO 3 than in the rare earth manganites since there is no perturbation from the rare earth f -electron magnetic moment. In addition, YMnO 3 forms both the hexagonal and orthorhombic phases on solution synthesis at ambient pressure [13] making it particularly appealing for use in a comparative study.…”

Section: Introductionmentioning

confidence: 99%

“…Early (1960s) work on YMnO 3 [13] established the hexagonal phase to be ferroelectric, with the hexagonal perovskite structure and the P 6 3 cm space group. The hexagonal perovskite structure consists of ABCACB... stacking of close packed O layers, with the Mn ions occupying 5-fold coordinated sites, and the rare earth atoms in 7-fold coordinated interstices.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

First principles study of structural, electronic and magnetic interplay in ferroelectromagnetic yttrium manganite

Filippetti¹,

Hill²

2001

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

We present results of local spin density approximation (LSDA) pseudopotential calculations for the ferroelectromagnet, yttrium manganite (YMnO3). The origin of the differences between ferroelectric and non-ferroelectric perovskite manganites is determined by comparing the calculated properties of yttrium manganite in its ferroelectric hexagonal and non-ferroelectric orthorhombic phases. In addition, orthorhombic YMnO3 is compared with the prototypical non-ferroelectric manganite, lanthanum manganite. We show that, while the octahedral crystal field splitting of the cubic perovskite structure causes a centro-symmetric Jahn-Teller distortion around the Mn 3+ ion, the markedly different splitting in hexagonal perovskites creates an electronic configuration consistent with ferroelectric distortion. We explain the nature of the distortion, and show that a local magnetic moment on the Mn 3+ ion is a requirement for it to occur. pacs numbers 75.50. Dd,71.15.Mb

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

First principles study of structural, electronic and magnetic interplay in ferroelectromagnetic yttrium manganite

Filippetti¹,

Hill²

2001

Journal of Magnetism and Magnetic Materials

View full text Add to dashboard Cite

show abstract

“…In early works in the 1960s, the ferroelectricity (T C $ 950 K) in hexagonal YMO was ascribed to an offcenter distortion of Mn 3þ towards one of the apical oxygen ions. 79,80 However, recent detailed single crystal x-ray diffraction experiments revealed that the Mn ions remain very close to the centre of the oxygen bipyramids, and the ferroelectric phase should be ascribed to the buckling of the layered MnO 5 bipyramids accompanied by the displacements of the Y ions. 78 The mechanism of the ferroelectricity in hexagonal YMO is associated with the strong hybridization between Y 4d and O 2p states.…”

Section: Antiferromagnetic Rmnomentioning

confidence: 98%

Multiferroic oxide thin films and heterostructures

Tian

et al. 2015

Applied Physics Reviews

142

View full text Add to dashboard Cite

Multiferroic materials promise a tantalizing perspective of novel applications in next-generation electronic, memory, and energy harvesting technologies, and at the same time they also represent a grand scientific challenge on understanding complex solid state systems with strong correlations between multiple degrees of freedom. In this review, we highlight the opportunities and obstacles in growing multiferroic thin films with chemical and structural integrity and integrating them in functional devices. Besides the magnetoelectric effect, multiferroics exhibit excellent resistant switching and photovoltaic properties, and there are plenty opportunities for them to integrate with other ferromagnetic and superconducting materials. The challenges include, but not limited, defect-related leakage in thin films, weak magnetism, and poor control on interface coupling. Although our focuses are Bi-based perovskites and rare earth manganites, the insights are also applicable to other multiferroic materials. We will also review some examples of multiferroic applications in spintronics, memory, and photovoltaic devices.

show abstract

“…I t should be noted that,, whereas the rocking curve scan is tangevstiab in reciprocal space. t'he st'andard scan on conventional diffractomet'ers, such as used by Walker et al [3] and Take1 and Borie [ 5 ] , is a radial scan in reciprocal space. Because of this difference in scanning directjion, it should be expected that apparent line profiles by the two methods would be different, as is the case.…”

Section: Examination Of As-irradiated Rrystalsmentioning

confidence: 99%

“…The appearance of duplex structure in (hkl) reflections was considered by Sabine, who concluded on formal mathematical bases t>hat the duplex structure in X-ray diffraction pat>terns was consistent with the presence of interplanar clust>ers parallel t)o the basal plane [4]. By a somewhat different approach, Yakel and Borie also credited int,erplanar clusters for the observed broadening of ( h k l ) reflect>ions from polycrystalline Be0 [ 5 ) . The presence of small clu-t b ers has also been notjed by neutron scattering [S!…”

Section: Introductionmentioning

confidence: 99%

Dimensional and X‐Ray Diffraction Changes in Irradiated Single Crystal BeO

Austerman¹,

Miller²

1965

Physica Status Solidi (b)

View full text Add to dashboard Cite

Single crystals of B e 0 were irradiated by high energy (2 1 MeV) neutrons to doses of 102" t o 6:. 102O nvt a t low temperature (< 100 "C). The crystal structure effects of irradiation were examined by X-ray diffraction and measurement of interfacial angles between crystallographic faces. The diffraction patterns are characterized by duplex reflect,ions each composed of a sharp and a broad component. The sharp component is attributed to t,he matrix crystal volume, which is expanded by a random distribution of point defects. The broad component is attributed t o t h e presence of interplanar clusters lying parallel to the basal plane. This structure showed little change below 800 O C with short-term anneal. Between 800 and 1600OC there was nearly complete recovering of line breadth and lattice constants. The annealing data indicate ( I ) removal of the point defects, and (2) some growth of cluster size, during thermal annealing.BeO-Einkristalle wurden mit Neutronen hoher Energie ( 2 1 MeV; Dosis lozo bis 6 >' lo2" n'eutronen pro Zeiteinheit) bei tiefen Temperatnren (< 100 "C) best,rahlt. Der EinfluB dieser Bestrahlung auf die Kristallstruktur wurde mit Hilfe der Rontgenbeugung und Messungen der Greuzflachenwinkel zwischen kristallographischen Flachen untersucht. Die Beugungsbilder sind durch Doppelreflexe charakterisiert, von denen jede aus einer scharfen und einer breiten Komponente zusammengesetzt ist. Die scharfe Komponente mird dem Matrixvolumen zugeschrieben, das durch eine statistische Verteilung von Punktdefekten gedehnt ist. Die breite Komponentc wird durch die Anwesenheit von interplanaren Anhaufungen erklart, die parallel zur Basisflache liegen. Diese Struktur zeigt geringe Veranderungen bei kurzzeitiger Temperung unterhalb 800 O C . Zwischen 800 und 1600 "C erholen sich die Linienbreiten und Gitterkonstantm nahezu vollstandig. Die Temperungsergebnisse zeigen 1) eine Beseitigung von Punktdefekteu und 2) ein gewisses Aniva.chsen der GroBe der Anhaufung wahrend der Temperung. 2, Private communication from J. M. McKenna, Philips Petroleum Co., Idaho Falls. 3, Private communication from C. G. Collins, General Electric Co., Cincinnati, Ohio. Idaho. 16'

show abstract

Structural changes in irradiated BeO

Cited by 35 publications

References 4 publications

First principles study of structural, electronic and magnetic interplay in ferroelectromagnetic yttrium manganite

First principles study of structural, electronic and magnetic interplay in ferroelectromagnetic yttrium manganite

Multiferroic oxide thin films and heterostructures

Dimensional and X‐Ray Diffraction Changes in Irradiated Single Crystal BeO

Contact Info

Product

Resources

About