scispace - formally typeset
Search or ask a question
Author

C.F. Woensdregt

Bio: C.F. Woensdregt is an academic researcher from Utrecht University. The author has contributed to research in topics: Hexagonal prism & Crystal. The author has an hindex of 8, co-authored 12 publications receiving 163 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the structural morphol. of YBa2Cu3O7-x (YBCO) was investigated by application of the periodic bond chain (PBC) theory.

49 citations

Journal ArticleDOI
TL;DR: The Hartman-Perdoktheory enables one to establish the order of morphological importance of the ADP (NH4H2PO4) crystal faces from its crystal structure as mentioned in this paper.

20 citations

Journal ArticleDOI
TL;DR: In this paper, the Hartman-Perdok analysis of spinels has been used to define the surface topology of the spinel, which can be ordered or disordered.

20 citations

Journal ArticleDOI
TL;DR: The attachment energies of the F faces have been calculated in different electrostatic point charge models, in which the point charges of the ions forming the Si-O tetrahedral bonds vary from the completely ionic model with formal charges, to the covalent one with reduced charges as mentioned in this paper.

14 citations

Journal ArticleDOI
TL;DR: The structural morphology of compounds having the PbCl 2 and the closely related SbSI structures has been determined in this paper, based upon the nine-coordination of Pb atoms.

14 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: A comprehensive review on the role that polarity plays at oxide surfaces, interfaces and in nano-objects can be found in this article, with special emphasis on ternary compound surfaces and on polarity effects in ultra-thin films.
Abstract: Whenever a compound crystal is cut normal to a randomly chosen direction, there is an overwhelming probability that the resulting surface corresponds to a polar termination and is highly unstable. Indeed, polar oxide surfaces are subject to complex stabilization processes that ultimately determine their physical and chemical properties. However, owing to recent advances in their preparation under controlled conditions and to improvements in the experimental techniques for their characterization, an impressive variety of structures have been investigated in the last few years. Recent progress in the fabrication of oxide nano-objects, which have been largely stimulated by a growing demand for new materials for applications ranging from micro-electronics to heterogeneous catalysis, also offer interesting examples of exotic polar structures. At odds with polar orientations of macroscopic samples, some smaller size polar nano-structures turn out to be perfectly stable. Others are subject to unusual processes of stabilization, which are absent or not effective in their extended counterparts. In this context, a thorough and comprehensive reflexion on the role that polarity plays at oxide surfaces, interfaces and in nano-objects seems timely.This review includes a first section which presents the theoretical concepts at the root of the polar electrostatic instability and its compensation and introduces a rigorous definition of polar terminations that encompasses previous theoretical treatments; a second section devoted to a summary of all experimental and theoretical results obtained since the first review paper by Noguera (2000 J. Phys.: Condens. Matter 12 R367); and finally a discussion section focusing on the relative strength of the stabilization mechanisms, with special emphasis on ternary compound surfaces and on polarity effects in ultra-thin films.

628 citations

Book
01 Jan 1984
TL;DR: In this paper, the authors present a model for the systematic construction of R(n,A) functions by a sequence of assembling steps, based on a model of the crystal surface as a branch of soliton physics.
Abstract: -- Part C: 1. The continuum approach to crystal interfaces: basics. I: Theoretical framework. 2. Operators for orientation-dependent parameters. 3. Mechanics and thermodynamics of interfaces. 4. Equilibrium structures of junctions, edges and vertices. 5. Growth: kinematic wave theory revisited. 6. Kinetic behaviour of junctions, edges and vertices. 7. Structural phase transitions of a crystal surface as a branch of soliton physics. 8. Miscellaneous topics. II: Growth rate functions. 9. Analytic representations of R(n,A) functions. 10. Nonlinear networks and the 'assembled function' notation. 11. Physical aspects of assembling operations. 12. The systematic construction of R(n,A) functions by a sequence of assembling steps. 13. Notes on sphere-growth experiments. 14. Summary: Conclusions and outstanding questions. References. List of symbols, abbreviations and notations.

274 citations

Journal ArticleDOI
TL;DR: In this article, the authors used the Bravais-Friedel, Donnay-Harker model to predict crystal morphologies from data stored in files in the CIF format.
Abstract: Crystal morphologies are predicted from data stored in files in the CIF format (crystallographic information file standard of the International Union of Crystallography) on the basis of the Bravais–Friedel, Donnay–Harker model. Several simple improvements to the calculation are introduced with Win­XMorph, version 1.4.9, in conjunction with illustrations of the morphologies of quartz, sucrose, lactose, pyrite and lysozyme. The morphologies of the recently discovered pentamorphs of 1,8-dihydroxyanthraquinone are predicted. Win­XMorph is available free-of-charge for educational use.

199 citations

Journal ArticleDOI
TL;DR: In this paper, the authors review the knowledge available for high-alumina spinel-containing castables (preformed and in situ) in order to provide a support for novel technological developments in the area.

168 citations

Journal ArticleDOI
TL;DR: In this article, a novel crystal growth method has been established for the growth of single crystal with selective orientation at room temperature using volatile solvent, the saturated solution containing the material to be crystallized was taken in an ampoule and allowed to crystallize by slow solvent evaporation assisted with a ring heater.

168 citations