scholarly journals Relationship of Crystal Structure, Lattice Parameters and Thermal Expansion to Nonstoichiometry in La1−xMnO3+d and La1−xSrxMnO3+d Determined by High-Temperature X-Ray Diffraction Under Controlled Oxygen Partial Pressures

1995 ◽  
Vol 1995-1 (1) ◽  
pp. 444-453 ◽  
Author(s):  
Junichiro Mizusaki
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
High Temperature ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
Partial Pressures ◽  
Relationship Of

β-Ca11B2Si4O22: six-fold twinning, crystal structure and thermal expansion

2018 ◽  
Vol 233 (6) ◽  
pp. 379-390 ◽  
Author(s):  
Sergey N. Volkov ◽  
Valentina A. Yukhno ◽  
Rimma S. Bubnova ◽  
Vladimir V. Shilovskikh
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
High Temperature ◽  
Electron Backscatter Diffraction ◽  
Monoclinic Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Backscatter ◽  
Backscatter Diffraction ◽  
Relationship Of

Abstract The low-temperature polymorph β-Ca11B2Si4O22 crystallizes as a monoclinic structure [space group is P21/c, a=14.059(9), b=6.834(5), c=10.597(7) Å, β=100.735(8)°]. The crystal investigated by single-crystal X-ray diffraction was a twin composed of six individuals. The crystal structure is similar to that of mineral spurrite, Ca5(SiO4)2CO3, and can be described as a framework of [CaO5] and [CaO6] polyhedra, the cavities of which are filled with [SiO4] and [BO3] groups. The orientation relationship of twin domains was investigated by electron backscatter diffraction (EBSD). Thermal expansion was studied by high-temperature X-ray powder diffraction. It is slightly anisotropic: α11=10, α22=16, α33=12×10−6°C−1 at 200°C.

Polymorphic transformations and thermal expansion of some modifications in Ag1.5Cu0.5Se and Ag0.4Cu1.6Se

2019 ◽  
Vol 33 (23) ◽  
pp. 1950271 ◽  
Author(s):  
Y. I. Aliyev ◽  
Y. G. Asadov ◽  
A. O. Dashdemirov ◽  
R. D. Aliyeva ◽  
T. G. Naghiyev ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Diffraction Method ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
Polymorphic Transformations ◽  
X Ray

The Ag[Formula: see text]Cu[Formula: see text]Se and Ag[Formula: see text]Cu[Formula: see text]Se compounds have been synthesized and grown as single crystals. High-temperature X-ray diffraction method was used to study polymorphic transformations. It is shown that the Ag[Formula: see text]Cu[Formula: see text]Se crystals of high-temperature FCC modification are decomposed into Ag2Se and AgCuSe when the temperature decreases below T = 488 K and Ag[Formula: see text]Cu[Formula: see text]Se is decomposed into Cu2Se and AgCuSe when the temperature decreases below T = 540 K. Transformations in both compounds are reversible. Crystalline parameters are obtained and the temperature dependence of the lattice parameters for each phase is built.

Lattice parameters and thermal expansion of the T2-phase of the Nb–Si–B system investigated by high-temperature X-ray diffraction

2004 ◽  
Vol 12 (2) ◽  
pp. 181-188 ◽  
Author(s):  
Geovani Rodrigues ◽  
Carlos Angelo Nunes ◽  
Paulo Atsushi Suzuki ◽  
Gilberto Carvalho Coelho
Keyword(s):  
Thermal Expansion ◽  
High Temperature ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
X Ray

Therman Expansion and Crystal Chemistry of (Sr1−x , K2x )Zr4(PO4)6 Ceramic

1995 ◽  
Vol 28 (5) ◽  
pp. 508-512 ◽  
Author(s):  
D.-M. Liu ◽  
L.-J. Lin ◽  
C.-J. Chen
Keyword(s):  
Crystal Structure ◽  
Grain Size ◽  
Thermal Expansion ◽  
High Temperature ◽  
Crystal Chemistry ◽  
X Ray Diffraction ◽  
Lattice Thermal Expansion ◽  
X Ray ◽  
Thermal Expansion Anisotropy ◽  
Sufficient Degree

Thermal expansion of (Sr1−x , K2x )Zr4(PO4)6 (SrKZP) (with x = 0–1) ceramic was investigated using both a dilatometer and a high-temperature X-ray diffractometer. The coefficients of thermal expansion (CTEs) of the SrKZP ceramic measured by the dilatometer demonstrate a similar trend as those from high-temperature X-ray diffraction. Both measurements show an ultra-low CTE at x = 0.5; nevertheless, this composition shows significant lattice thermal-expansion anisotropy (TEA), while the minimum TEA appears with composition x = 0.2. Although it possessed a sufficient degree of TEA, the x = 0.5 composition showed no visible microcracks or negligible microcracks over a grain size as large as 15 μm. A transition of space group from R{\bar 3} to R{\bar 3}c with composition between x = 0.3 and x = 0.5 has been observed. The crystal structure of the SrKZP ceramic with possible occupations of strontium and/or potassium within the lattice in relation to their influence on the CTEs is proposed.

scholarly journals Synthesis, Structure and Thermophysical Properties of Phosphates MNi0.5Zr1.5(PO4)3 (M = Mg, Ca, Sr)

2010 ◽  
Vol 12 (3,4) ◽  
pp. 241 ◽  
Author(s):  
M.V. Sukhanov ◽  
I.A. Schelokov ◽  
V.I. Pet'kov ◽  
E.R. Gobechiya ◽  
Yu.K. Kabalov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Capacity ◽  
Thermal Expansion ◽  
High Temperature ◽  
Single Phase ◽  
Rietveld Method ◽  
Type Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Behavior

<p>New phosphates MNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> (M = Mg, Ca, Sr) were prepared by the precipitating method.<strong><em> </em></strong>Phosphates were characterized using X-ray powder diffraction, IR-spectroscopy and electron microprobe analyses. The crystal structure of phosphates was refined by the Rietveld method. Phosphates CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> and SrNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> are shown to have been crystallized in the NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>-type structure and the phosphate MgNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3 </sub>was obtained as a single-phase with Sc<sub>2</sub>(WO<sub>4</sub>)<sub>3</sub>-type structure. Heat capacity of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was measured in the range 7 – 650 K and increased monotonically over the entire temperature range studied. Thermal expansion of phosphate CaNi<sub>0.5</sub>Zr<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> was studied in the interval 295-1073 K by the high temperature X-ray diffraction. This phosphate is similar to the best low-expansion ceramics, such as zircon, cordierite and silica glass in thermal expansion behavior.</p>

A high-temperature X-ray diffraction study of the NiO–Li2O system

1971 ◽  
Vol 4 (4) ◽  
pp. 293-297 ◽  
Author(s):  
C. J. Toussaint
Keyword(s):  
Crystal Structure ◽  
Phase Diagram ◽  
Thermal Expansion ◽  
High Temperature ◽  
Transition Temperature ◽  
Diffraction Study ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystallographic Study

A crystallographic study of the system Ni2+ 1−2x Ni3+ x Li+ x O has been carried out. The crystal structure of the material in the range 0≤x≤0.4 at room temperature and up to 1000°C has been studied. The principal coefficients of thermal expansion and the phase diagram are given. The structural rhombohedral → face-centred cubic transition temperature of NiO has been determined.

Structural and thermal properties of Cu1.75−xMxTe crystals

2020 ◽  
Vol 34 (19) ◽  
pp. 2050180
Author(s):  
Y. I. Aliyev ◽  
Y. G. Asadov ◽  
L. B. Rustamova ◽  
A. O. Dashdemirov ◽  
N. A. Ismayilova ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Room Temperature ◽  
Lattice Parameters ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cubic Phases ◽  
Temperature Dependences ◽  
Cubic Structure

Single crystals of Cu[Formula: see text]Te, Cu[Formula: see text]Zn[Formula: see text]Te and Cu[Formula: see text]Cd[Formula: see text]Te compounds were synthesized by Brijmen method and their crystal structure was studied by X-ray diffraction. The hexagonal, orthorhombic aand cubic structure phases of these compounds have been determined at room-temperature. Phase transitions at high-temperatures were observed. Lattice parameters for hexagonal, orthorhombic and cubic phases have been determined in the temperature range of [Formula: see text]–1073 K. From the temperature dependences of the lattice parameters, the coefficients of thermal expansion of the existing modifications in the main crystallographic directions were calculated.

Crystal structure and thermal properties of compound K2Zn3(P2O7)2

2008 ◽  
Vol 23 (4) ◽  
pp. 317-322 ◽  
Author(s):  
L. N. Ji ◽  
G. M. Cai ◽  
J. B. Li ◽  
J. Luo ◽  
J. K. Liang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Heating Curve ◽  
X Ray ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

K2Zn3(P2O7)2 was synthesized by solid state reaction and its crystal structure was determined by ab initio method from powder X-ray diffraction (XRD) data. The title compound was determined to be orthorhombic with space group P212121, Z=4, and lattice parameters a=12.901(8) Å, b=10.102(6) Å, and c=9.958(1) Å. Values of lattice parameters from 303 to 573 K were measured by temperature-dependent XRD. Thermal expansion coefficients α0, lattice parameters, and cell volume at 0 K were determined to be α0(a)=1.62327×10−4/K, a0=12.855(4) Å, α0(b)=1.17921×10−4/K, b0=10.070(8) Å, α0(c)=2.62364×10−4/K, c0=9.880(4) Å, and α0(V)=6.599×10−2/K, V0=1278.967(0) Å3. The specific heat equation as a function of temperature was determined to be Cp=0.77115+0.00231T−1241.60027T−2−1.4133×10−6T2 (J/K g), for temperatures from 198 to 710 K. The melting point estimated from the μ-DTA heating curve is 795 °C.

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