Influence of Nitrogen Concentrations on the Lattice Constants and Resistivities of n-Type 4H-SiC Single Crystals

2015 ◽  
Vol 15 (7) ◽  
pp. 3131-3136 ◽  
Author(s):  
Yingxin Cui ◽  
Xiaobo Hu ◽  
Kun Yang ◽  
Xianglong Yang ◽  
Xuejian Xie ◽  
...  
Keyword(s):  
Single Crystals ◽  
Lattice Constants ◽  
Nitrogen Concentrations

Investigation on the Growth and Properties of Six Garnet Single Crystals with Large Lattice Constants

2021 ◽  
pp. 2000221
Author(s):  
Zhiyuan Han ◽  
Dunlu Sun ◽  
Huili Zhang ◽  
Jianqiao Luo ◽  
Cong Quan ◽  
...  
Keyword(s):  
Single Crystals ◽  
Lattice Constants ◽  
Large Lattice

scholarly journals Zur Kenntnis eines Barium-Oxoniobat-Tellurats: Ba2Nb2TeO10 / On a Barium-Oxoniobate-Tellurate: Ba2Nb2TeO10

1996 ◽  
Vol 51 (10) ◽  
pp. 1407-1410 ◽  
Author(s):  
B. Wedel ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reactions ◽  
Orthorhombic Symmetry ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Single crystals of Ba2Nb2TeO10) have been prepared by solid state reactions in air. X-ray investigations led to orthorhombic symmetry, space group D152h-Pbca, a = 7.242(4), b = 12.433(3), c = 9.932(3) Å. Z = 4. Nb5+ and Te6+ show octahedral coordination by O2- . The crystal structure is characterized by planes of edge- and corner-sharing NbO6- and TeO6octahedra. It is shown that in spite of nearly identical lattice constants of Ba2Nb2TeO10 with compounds of the composition M0,5BaNbTe2O9 the so far unknown crystals of these substances may not be derived from the Ba2Nb2TeO10 type.

Quaternäre Strontium-Kupfer(I)-Lanthanoid(III)-Selenide mit Cer und Praseodym: SrCuCeSe3 und SrCuPrSe3, ein ungleiches Geschwisterpaar / Quaternary Strontium Copper(I) Lanthanoid(III) Selenides with Cerium and Praseodymium: SrCuCeSe3 and SrCuPrSe3, Unequal Brother and Sister

2004 ◽  
Vol 59 (9) ◽  
pp. 985-991 ◽  
Author(s):  
Sabine Strobel ◽  
Thomas Schleid
Keyword(s):  
Single Crystals ◽  
Coordination Number ◽  
Unit Cell ◽  
Structural Relationship ◽  
The Other ◽  
Space Group ◽  
Lattice Constants ◽  
The Third ◽  
Other Hand ◽  
Third Dimension

Quaternary strontium copper(I) lanthanoid(III) selenides are formed by the oxidation of elemental strontium, copper and the corresponding lanthanoid with selenium. Orange to red needle-shaped single crystals of SrCuPrSe3 and SrCuCeSe3 have been synthesized by heating mixtures of Sr, Cu, Pr / Ce and Se with CsI as a flux in evacuated silica tubes to 800°C for 7 d. Both compounds crystallize orthorhombically in space group Pnma with four formula units per unit cell, but with unlike lattice constants (a = 1097.32(6), b = 416.51(2), c = 1349.64(8) pm for SrCuPrSe3 and a = 846.13(5), b = 421.69(2), c = 1663.42(9) pm for SrCuCeSe3) and therefore different structure types. The Pr3+ cations in SrCuPrSe3 are surrounded octahedrally by six Se2− anions forming chains of edge-sharing [PrSe6]9− octahedra that are joined by common vertices. Together with [CuSe4]7− tetrahedra they form [CuPrSe3]2− layers piled up parallel (001). Between those layers the Sr2+ cations are coordinated by seven Se2− anions in the shape of capped trigonal prisms linking the structure in the third dimension. On the other hand in SrCuCeSe3 the Ce3+ cations as well as the Sr2+ cations adopt a coordination number of seven. Since the bonding distances between cerium and selenium match with those of strontium and selenium the two crystallographically independent sites of these cations are occupied statistically by Ce3+ and Sr2+ with equal ratios. Nevertheless, there is a close structural relationship between SrCuPrSe3 and SrCuCeSe3. Similar to SrCuPrSe3 where Cu+ and Pr3+ cations together with Se2− anions form [CuPrSe3]2− layers parallel (001), the Cu+ cations and [(Ce1/Sr1)Se7]11.5− polyhedra in SrCuCeSe3 build strongly puckered layers which are connected by (Ce2)3+/(Sr2)2+ cations. The copper selenium part in both compounds correlates as well, with [CuSe4]7− tetrahedra linked by common vertices to form [CuSe3]5− chains running along [010].

Zur Kenntnis von Ba2Fe22+ Fe93+Al11O34 / About Ba2Fe22+ Fe93+Al11O34

1978 ◽  
Vol 33 (2) ◽  
pp. 146-148 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
M. Harder
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Data Space ◽  
Group D ◽  
O 11

Single crystals of the compound Ba2Fe11Al11O34 were prepared by solid state reaction (1700 °C) of BaO-Fe2O3-Al2O3 mixtures. The crystal structure was investigated by X-ray data (space group D46h-P63/mmc, lattice constants: a = 565.3, c = 2281.0 pm). Ba2Fe11Al11O34 is isotypic with Na2O · 11 Al2O3, the structure of β-alumina

Isolierte trigonale SrO6 – Prismen verknüpfen Kagome-Netze im Strontium-Manganat(IV)-Tellurat(VI): SrMnTeO6 / Kagomé Layers Connected by Isolated Trigonal SrO6 Prisms in the Strontium Manganate(IV) Tellurate(VI): SrMnTeO6 L

1998 ◽  
Vol 53 (3) ◽  
pp. 283-286 ◽  
Author(s):  
L. Wulff ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Hexagonal Symmetry ◽  
Unknown Compound ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Abstract Single crystals of the hitherto unknown compound SrMnTeO6 have been prepared from Sr(OH)2 ·8H2O , MnCO3(aq) and TeO2 in air by crystallization below the melt range. X-ray investigations showed hexagonal symmetry, space group D33h -P6̅2m, lattice constants a = 5.143( 1), c = 5.384(2) A, Z = 1. SrMnTeO6 is characterized by staggered [(Mn/Te)6O18] Kagome layers along [001]. These layers are connected by Sr2+ ions, resulting in SrO6 prisms isolated from each other. The structure is discussed with respect to the connection of Kagome nets in the quaternary oxides of the Ba3Ln4O9 type.

Über Oxocuprate, ΧΧΙII Zur Kenntnis von Ho2Cu2O5 / On Oxocuprates, XXIII About Ho2Cu2O5

1977 ◽  
Vol 32 (6) ◽  
pp. 609-611 ◽  
Author(s):  
H.-R. Freund ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Single Crystals ◽  
Oxide Mixture ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants ◽  
Data Space

Single crystals of the compound Ho2Cu2O5 were obtained by melting the oxide mixture (2 CuO : 1 Ho2O3), using KF as a flux. The crystal structure was investigated by single crystal X-ray data (Space group C2v9-P 21 nb, lattice constants: a = 1247.8, b = 1081.3, c = 349.5 pm).

Ein Titan-Tantaloxid mit TiII: Ti0,33 Ta0,67O2 (TiTa2O6) / A Titanium Tantalum Oxide of TiII: Ti0,33 Ta0,67O2 (TiTa2O6)

1995 ◽  
Vol 50 (8) ◽  
pp. 1167-1170 ◽  
Author(s):  
E. Peters ◽  
Hk. Müller-Buschbaum
Keyword(s):  
Single Crystals ◽  
Tantalum Oxide ◽  
Tetragonal Symmetry ◽  
Rutile Structure ◽  
Lattice Constants ◽  
General Terms ◽  
Laser Techniques ◽  
Group D ◽  
Symmetry Space ◽  
Symmetry Space Group

Black single crystals of Ti0.33Ta0.67O2 have been prepared by CO2-LASER techniques heating a mixture of TiO and Ta2O5 to T > 2000 °C. The titanium tantalum oxide crystallizes with tetragonal symmetry, space group D144h -P42/mnm, lattice constants a = 4.7344(6) Å c = 3.0504(2) Å, Z = 2. Ti0.33Ta0.67O2 represents the compound TiTa2O6 with rutile structure because of the statistical distribution of Ti2+ and Ta5+. The composition of rutile-type compounds is discussed in more general terms.

Composition and temperature dependence of band gap and lattice constants of MgxCd1–xSe single crystals

2006 ◽  
Vol 3 (8) ◽  
pp. 2665-2668 ◽  
Author(s):  
Duck-Tae Kim ◽  
Sang-An Park ◽  
Woon-Jo Jeong ◽  
Gye-Choon Park ◽  
Moon-Seog Jin ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Band Gap ◽  
Single Crystals ◽  
Lattice Constants

Orientation of Back Reflection Laue Photographs: A Semi-Automated Approach

1975 ◽  
Vol 19 ◽  
pp. 725-734 ◽  
Author(s):  
R. P. Goehner
Keyword(s):  
Computer Simulation ◽  
Single Crystals ◽  
Stereographic Projection ◽  
Crystallographic Plane ◽  
Polycrystalline Materials ◽  
Laue Pattern ◽  
X Ray ◽  
Lattice Constants ◽  
Stereographic Triangle ◽  
Back Reflection

Computer simulation of back reflection Laue patterns now provides the means to plot Laue patterns for any crystal system in any orientation. This capability makes it possible to determine, rapidly and accurately, the orientation of single crystals and large grains in polycrystalline materials even in cases where little or no symmetry is displayed in the Laue photograph. A set of standard Laue patterns is first simulated to cover the stereographic triangle of the crystal being studied. The Laue photograph obtained from the crystal, or grain, is compared with the set of simulated Laue patterns. The pattern most similar to the photograph is used to determine the (HKL) values of three Laue spots. The (HKL) values of these spots and half their angular separations from the x-ray beam, along with the lattice constants, are used by a computer program to calculate the (HKL) value of the crystallographic plane perpendicular to the x-ray beam. A simulated Laue pattern can now be obtained in exactly the same orientation and it can be drawn directly to the scale of the Laue photograph. Thus the validity of the orientation can be easily verified by direct comparison. The (HKL) value of the crystallographic plane perpendicular to the x-ray beam can also be used to plot a stereographic projection of the crystal poles. Therefore, the complete orientation of the crystal can be determined.

Ho4C7, Y4C7: Carbide mit C34-- und C4- -Ionen / Ho4C7, Y4C7: Carbides with C34- and C4- Ions

1994 ◽  
Vol 49 (10) ◽  
pp. 1439-1443 ◽  
Author(s):  
Hansjürgen Mattausch ◽  
Thomas Gulden ◽  
Reinhard K. Kremer ◽  
Jörg Horakh ◽  
Arndt Simon
Keyword(s):  
Single Crystals ◽  
Space Group ◽  
Lattice Constants ◽  
Carbon Species ◽  
Moisture Sensitive ◽  
New Compounds

AbstractThe new compounds Ho4C7 and Y4C7 have been prepared by reaction of stoichiometric amounts of the metals and C in closed Ta capsules at 1450 and 1300 K. respectively. With HoF3 as a flux, black, needle like single crystals of Ho4C7 were obtained, which are air and moisture sensitive. Ho4C7 crystallizes in the space group P21/n (No. 14) with lattice constants a = 368.06(3), b = 1251.8(1). c = 1364.4(2) pm and β = 96.62(1)°. Y4C7 with a = 370.08(5), b = 1258.9(1), c = 1371.8(1) and β = 96.61(1)°.Two different kinds of carbon species occur in the two structures: isolated C4- ions and C34- units, respectively. The C4- ions are octahedrally surrounded by Ho-atoms. The Ho6C octahedra are condensed to form double chains parallel [100]. The chains are linked via C34- ions, which occupy positions above the edges of the Ho octahedra. Additional Ho atoms are located in voids between the C34- units.The compounds are electrically semiconducting. Ho4C7 has a magnetic Curie-Weiss behaviour with θ= -28(4) K and µeff= 8.8(2) µB.

Sign in / Sign up

Export Citation Format

Share Document