https://orcid.org/0000-0001-9560-4728 https://orcid.org/0000-0002-5149-603X https://orcid.org/0000-0002-6776-1213 https://orcid.org/0000-0003-0698-4891 https://orcid.org/0000-0001-7564-7990 PLDO focuses on the description of planar defects in crystalline materials. Planar Defects Ontology (PLDO) Examples of a Contributor include a person, an organization, or a service. Typically, the name of a Contributor should be used to indicate the entity. Contributor An entity responsible for making contributions to the resource. Examples of a Creator include a person, an organization, or a service. Typically, the name of a Creator should be used to indicate the entity. Creator An entity primarily responsible for making the resource. Description may include but is not limited to: an abstract, a table of contents, a graphical representation, or a free-text account of the resource. Description An account of the resource. Title A name given to the resource. In current practice, this term is used primarily with literal values; however, there are important uses with non-literal values as well. As of December 2007, the DCMI Usage Board is leaving this range unspecified pending an investigation of options. The range of skos:altLabel is the class of RDF plain literals. skos:prefLabel, skos:altLabel and skos:hiddenLabel are pairwise disjoint properties. alternative label An alternative lexical label for a resource. Acronyms, abbreviations, spelling variants, and irregular plural/singular forms may be included among the alternative labels for a concept. Mis-spelled terms are normally included as hidden labels (see skos:hiddenLabel). definition A statement or formal explanation of the meaning of a concept. example An example of the use of a concept. A general note, for any purpose. A resource has no more than one value of skos:prefLabel per language tag, and no more than one value of skos:prefLabel without language tag. The range of skos:prefLabel is the class of RDF plain literals. skos:prefLabel, skos:altLabel and skos:hiddenLabel are pairwise disjoint properties. preferred label The preferred lexical label for a resource, in a given language. has tilt component The relation between a mixed grain boundary and the tilt grain boundary component. has twist component The relation between a mixed grain boundary and the twist grain boundary component. geometrical degrees of freedom The geometrical degrees of freedom are the parameters that are necessary to characterize a grain boundary. has GB plane A data property indicating the grain boundary (GB) plane using Miller Indices. has misorientation angle A data property indicating the misorientation angle (θ) of the grains with respect to each other. has rotation axis A data property indication the rotation axis [uvw]. Sigma value of a GB is the coincidence index, calculated as the coincidence unit cell volume by the crystal primitive unit cell volume. The coincidence index refers to the Coincidence Site Lattice (CSL). has sigma value A data property linking a GB with its sigma value. In simulations of grain boundaries, the macroscopic DOFs are imposed on the structure. macroscopic degrees of freedom There are five macroscopic degrees of freedom (DOFs) that are sufficient to describe the thermodynamic description of the grain boundary. In simulations of grain boundaries, the microscopic DOFs are obtained after the grain boundary energy minimization. microscopic degrees of freedom The microscopic degrees of freedom (DOFs) refer to the translation of one crystal with respect to the other at the microscopic scale. The microscopic parameters result from the relaxation process and are not independent of the macroscopic parameters. Antiphase Boundary APB An antiphase boundary is a planar defect which occurs in ordered alloys. The boundary separates two domains of the same ordered phase. Grain Boundary GB A grain boundary is a planar defect that separates two crystals (or grains) of the same material. Reference: ISBN 978-94-007-4968-9 Low Angle Grain Boundary Low-Angle Grain Boundary A low angle GB is a grain boundary with a misorientation angle lower than 15 degrees. Reference: ISBN 978-94-007-4968-9 Mixed Grain Boundary A mixed grain boundary is a grain boundary where the [uvw] rotation axis has perpendicular and parallel components with respect to the boundary plane. Planar Defect Interface A planar defect is a defect of the crystal structure across a plane. It is considered to be a two-dimensional defect, such as an internal interface or the surface. Stacking Fault A stacking fault is a planar defect created by an error (fault) in the order of the sequential layering of crystallographic planes. Surface The free surface (or external surface) of the material is a planar defect where the surface atoms have no neighbours or cohesive bonds on the external side. Reference: ISBN 978-94-007-4968-9 Symmetrical Tilt Grain Boundary A symmetrical tilt grain boundary is a tilt grain boundary where the two grains are symmetric. The boundary plane has the same Miller indices in crystals I and II: {hkl}_1 = {hkl}_2. Reference: ISBN 978-94-007-4968-9 Tilt Grain Boundary Tilt Boundary A twist boundary is a grain boundary with a [uvw] rotation axis perpendicular to the boundary plane. Twin Boundary A twin boundary is a planar defect that occurs between two separate crystals which are mirror images of each other, both crystals should have the same crystal structure. Reference: ISBN 978-94-007-4968-9 Twist Grain Boundary Twist Boundary A twist boundary is a grain boundary with a [uvw] rotation axis contained within the boundary plane. A meaningful collection of concepts. An idea or notion; a unit of thought. A set of concepts, optionally including statements about semantic relationships between those concepts. Thesauri, classification schemes, subject heading lists, taxonomies, 'folksonomies', and other types of controlled vocabulary are all examples of concept schemes. Concept schemes are also embedded in glossaries and terminologies. An ordered collection of concepts, where both the grouping and the ordering are meaningful. skos:broadMatch is used to state a hierarchical mapping link between two conceptual resources in different concept schemes. Relates a concept to a concept that is more general in meaning. skos:broaderTransitive is a transitive superproperty of skos:broader. A note about a modification to a concept. skos:closeMatch is used to link two concepts that are sufficiently similar that they can be used interchangeably in some information retrieval applications. In order to avoid the possibility of "compound errors" when combining mappings across more than two concept schemes, skos:closeMatch is not declared to be a transitive property. A note for an editor, translator or maintainer of the vocabulary. skos:exactMatch is used to link two concepts, indicating a high degree of confidence that the concepts can be used interchangeably across a wide range of information retrieval applications. skos:exactMatch is a transitive property, and is a sub-property of skos:closeMatch. Relates, by convention, a concept scheme to a concept which is topmost in the broader/narrower concept hierarchies for that scheme, providing an entry point to these hierarchies. A lexical label for a resource that should be hidden when generating visual displays of the resource, but should still be accessible to free text search operations. A note about the past state/use/meaning of a concept. Relates a resource (for example a concept) to a concept scheme in which it is included. Relates two concepts coming, by convention, from different schemes, and that have comparable meanings Relates a collection to one of its members. Relates an ordered collection to the RDF list containing its members. skos:narrowMatch is used to state a hierarchical mapping link between two conceptual resources in different concept schemes. Relates a concept to a concept that is more specific in meaning. skos:narrowerTransitive is a transitive superproperty of skos:narrower. A notation, also known as classification code, is a string of characters such as "T58.5" or "303.4833" used to uniquely identify a concept within the scope of a given concept scheme. Relates a concept to a concept with which there is an associative semantic relationship. skos:relatedMatch is used to state an associative mapping link between two conceptual resources in different concept schemes. A note that helps to clarify the meaning and/or the use of a concept. Links a concept to a concept related by meaning. Relates a concept to the concept scheme that it is a top level concept of.