Phase diagram for K(1-x)(NH4)(x)H2PO4 (x = 0 - 0.15) solid solutions embedded into magnetic glasses

We present a comparative study of tin segregation onto the (123) and (111) surfaces of a Ge(Sn)- 0.5 at. % bicrystal using the AES technique. Between 350°C and 450°C, the maximum segregated tin amount, about 1.25 monolayer, does not vary with the orientation of the surface or the temperature. This indicates that attractive Sn-Sn forces are involved in the segregated phase which is in fair agreement with the Ge-Sn phase diagram. The shape of the kinetic curves depends on the orientation. On the (111) surface, the formation of various structures in equilibrium with the bulk is correlated with surface reconstructions. First, Sn atoms take the place of Ge adatoms to form a 2D phase; then, Sn segregates in other superficial sites, which leads to the nucleation of denser 2D phases, such as (7 × 7) structure. On the (123) surface, Sn atoms take the place of Ge atoms in quasisubstitutional sites of the superficial layers; the kinetics of surface segregation is not sensitive to sub monolayer structures.

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Phase diagram of the Nd2Fe14B–Sm2Fe14B pseudo-binary system

Journal of Applied Crystallography ◽

10.1107/s1600576715022062 ◽

2016 ◽

Vol 49 (1) ◽

pp. 64-68 ◽

Cited By ~ 3

Author(s):

Ch. F. Xu ◽

K. H. Chen ◽

Z. F. Gu ◽

L. Y. Cheng ◽

D. D. Ma ◽

...

Keyword(s):

Crystal Structure ◽

Phase Diagram ◽

Binary System ◽

Solid Solutions ◽

Structure Parameters ◽

Rietveld Refinements ◽

X Ray ◽

Full Profile ◽

Cell Volumes ◽

Scanning Electron

The phase relations in the (1−x)Nd2Fe14B–xSm2Fe14B system over the whole concentration range have been studied by means of X-ray powder diffraction (XRD), differential thermal analysis (DTA) and scanning electron microscopy with energy-dispersive X-ray spectroscopy. Crystal structure parameters for all studied compositions of (Nd1−xSmx)2Fe14B have been determined by full-profile Rietveld refinements. These results revealed that all intermediate alloys of (Nd1−xSmx)2Fe14B are similar to the end member of the investigated system, Nd2Fe14B, with a tetragonal structure (space groupP42/mnm). The formation of continuous solid solutions has been found in this system. The normalized lattice parameters and unit-cell volumes of (Nd1−xSmx)2Fe14B solid solutions decrease linearly with increasing Sm content. The DTA measurements show that the melting temperature of (Nd1−xSmx)2Fe14B increases linearly with increasing Sm content and no metastable phases were detected. Based on the DTA data and XRD results, a tentative phase diagram for the pseudo-binary system Nd2Fe14B–Sm2Fe14B has been constructed.

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Phase diagram of the system of (1–х)BiFeO3–x PbFe0.5Nb0.5O3 solid solutions at room temperature

Crystallography Reports ◽

10.1134/s1063774516020231 ◽

2016 ◽

Vol 61 (2) ◽

pp. 263-269 ◽

Cited By ~ 6

Author(s):

L. A. Shilkina ◽

A. V. Pavlenko ◽

L. A. Reznitchenko ◽

I. A. Verbenko

Keyword(s):

Phase Diagram ◽

Solid Solutions ◽

Room Temperature

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Phase and Structural Behaviour in the NdAlO3-EuAlO3 System

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.200.93 ◽

2013 ◽

Vol 200 ◽

pp. 93-99 ◽

Cited By ~ 3

Author(s):

Natalia Ohon ◽

Leonid Vasylechko ◽

Yurii Prots ◽

Marcus Schmidt ◽

Caroline Curfs

Keyword(s):

Phase Diagram ◽

Phase Transitions ◽

Binary System ◽

Solid Solutions ◽

Room Temperature ◽

Structural Phase ◽

Structural Phase Transitions ◽

Structural Behaviour ◽

First Order

Phase and structural behaviour in the NdAlO3–EuAlO3 system has been studied in the whole concentration range. Depending on x two kinds of solid solutions Nd1‑xEuxAlO3 exist at room temperature: one with rhombohedral (x < 0.15) and one with orthorhombic (x≈ 0.15–0.20, where the co-existence of both phases was observed. First-order structural phase transitions Pbnm↔Rc has been detected in Nd1-xEuxAlO3 with x = 0.3, 0.4, 0.6 at 520 K, 627 K and 988 K, respectively. Based on the experimental and literature data, the phase diagram of the pseudo-binary system NdAlO3–EuAlO3 has been constructed.

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