Krystallbau und chemische Zusammensetzung

Goldschmidt, V. M.

doi:10.1002/cber.19270600550

Cited by 411 publications

(189 citation statements)

References 12 publications

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“…Generally, M s (D,T 0) increases with quantized features at low T [132][133][134] for FM metals, particularly of the 3d series, which have itinerant moments and the magnitude of the moment is affected by details of the band structure. Pauling [135] and Goldschmidt [136] premises that h would shrink by 12%, 4% and 3% if the CN of an atom reduces from 12 to 4, 6 and 8, respectively, which causes the 3d electrons to be more localized, and hence produces larger magnetic moment per atom than bulk. For instance, compared with the Ni, Co and Fe bulk moments of 0.6μ B , 1.7μ B and 2.2μ B [88], respectively, the average magnetic moment per atom (the M s per atom) increases to 1.05μ B , 2.35μ B and 3.1μ B as the cluster size is decreased from 700 atoms to 30 atoms [137].…”

Section: Magnetizationmentioning

confidence: 99%

Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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Due to the involvement of high portion of atomic coordination imperfection in surfaces and interfaces, the properties of magnetic nanocrystals dramatically differ from that of the corresponding bulk counterparts, which have led to a surge in both experimental and theoretical investigations in the past decades. This review summarizes the studies for these size-dependent magnetic properties, and additional thermal or phase stabilities, and mechanical properties. To interpret the above phenomena, a thermodynamic model for the size dependence and interface dependences of these properties is described, which is based on Lindemann s criterion for melting, Mott s expression for the vibrational melting entropy, and Shi s model for the size-dependent melting temperature. The model without any adjustable parameter is confirmed by a large number of experimental results, and helps us to understand the structures and properties of the magnetic nanocrystals. Moreover, other theoretical works on the above properties are also mentioned and commented.

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Section: Magnetizationmentioning

confidence: 99%

Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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“…6) is feasible and can be derived by simply estimating the ratio of the (A-X) and (B-X) bond distances, represented by Goldschmidt tolerance factor (t), 26 t ¼ ðr A þ r X Þ= ð2 1=2 ½r B þ r x Þ, where r A , r B and r X are the ionic radii of A, B and X, respectively. Within the range of 0:78 < t < 1:05, the perovskite structure can be stabilized.…”

Section: Structure and Physical Properties Of Chmentioning

confidence: 99%

Organometal Halide Perovskite Photovoltaics: A Diamond in the Rough

Grätzel

Park

2014

NANO

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The sun¯nds a diamond in the rough, which is the organo-metal halide perovskite. Thanks to exceptional optoelectronic characteristics, solar cells employing perovskite demonstrated¯rst a power conversion e±ciency (PCE) of 9.7% in the middle of 2012, which rose steeply to an amazing 16% at the end of 2013. Perovskite-based photovoltaics have several advantages over conventional semiconductor p-n junction devices because high e±ciency can be achieved from sub-micrometer-thick very cheap perovskite layers that can be formed by solution processing at temperatures below 150 C, rendering the perovskite solar cell versatile in its application. If photo-and thermal stability as well as tolerance to humidity can be achieved, commercial application on the large scale appear to be feasible.

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“…8) An ideal perovskite structure has an ABX 3 stoichiometry with a cubic crystal structure, which is composed of the three-dimensional framework of corner-shared BX 6 octahedrons. The A-site cation fills the 12 coordinate cavities formed by the BX 6 network and is surrounded by 12 equidistant X anions.…”

Section: )7)mentioning

confidence: 99%

The effect of Gd substitution in perovskite lanthanum strontium manganite films for use in resistive switching devices

Lee

Choi

Yeom

et al. 2014

J. Ceram. Soc. Japan

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La 0.7¹x Gd x Sr 0.3 MnO 3 (LSGMO: x = 0.1, 0.3, and 0.5) perovskite manganite thin films were formed on a Pt(111)/Ti/SiO 2 /Si(100) substrate heated to 500°C using a radio frequency magnetron sputter. The effects of substituted Gd 3+ on the physical, chemical, and electrical properties of perovskite manganite thin films were systematically investigated. X-ray diffraction results showed that the crystallinity of the films was affected by the substitution of La 3+ with Gd 3+ ions. Raman spectroscopy analysis showed an increase in both the tilt of the MnO 6 octahedron and the structural distortion as a result of Gd 3+ substitution. This is due to the increased structural instability of LSGMO associated with the rhombohedral structure, which can be contrasted with a stable crystalline structure of Gd 0.7 Sr 0.3 MnO 3 such as orthorhombic. From the above analyses, it was revealed that structural distortion, crystallinity, and bond strength could affect on resistive switching property.

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Krystallbau und chemische Zusammensetzung

Cited by 411 publications

References 12 publications

Size Dependence of Structures and Properties of Magnetic Materials

Size Dependence of Structures and Properties of Magnetic Materials

Organometal Halide Perovskite Photovoltaics: A Diamond in the Rough

The effect of Gd substitution in perovskite lanthanum strontium manganite films for use in resistive switching devices

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