Abstract
Interfaces in rocks, especially grain boundaries in olivine dominated rocks, have been subject to about 40 years of studies. The grain boundary structure to property relation is fundamental to understand the diverging properties of polycrystalline samples compared to those of single crystals. The number of direct structural observations is small, i.e. in range of 100 micrographs, and the number of measurements of properties directly linked to structural observations is even smaller. Bulk aggregate properties, such as seismic attenuation, rheology and electrical conductivity, are sensitive to grain size, and seem to show influences by grain boundary character distributions. In this context we review previous studies on grain boundary structure and composition and plausible relations to bulk properties. The grain boundary geometry is described using five independent parameters; generally, their structural width ranges between 0.4–1.2 nm and the commonly used 1 nm seems a good approximation. This region of enhanced disorder is often enriched in elements that are incompatible in the perfect crystal lattice. The chemical composition of grain boundaries depends on the bulk rock composition. We determined the 5 parameter grain boundary character distribution (GBCD) for polycrystaline Fo\(_{90}\) and studied structure and chemistry at the nm-scale to extend previous measurements. We find that grain boundary planes close to perpendicular to the crystallographic c-direction dominate the grain boundary network. We conclude that linking grain boundary structure in its full geometric parameter space to variations of bulk rock properties is now possible by GBCD determination using EBSD mapping and statistical analyses.
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Acknowledgements
We gratefully acknowledge discussions with our colleagues John Fitz Gerald, Ian Jackson and Chris Cline as well as Hauke Marquardt and Nobuyoshi Miyajima. We are also grateful for the technical support at ANU (Harri Kokkonen, Hayden Miller) and BGI (Hubert Schulz, Raphael Njul). U.F. acknowledges support from NSF grant EAR-1321889 and EAR-1464024. KM acknowledges support from the German Science Foundation (MA6287/3, MA6287/6). We also acknowledge the Earthquake Research Institute’s cooperative research program, and thank Sanae Koizumi for the sample synthesis at ERI in Tokyo. The FEI Scios FIB machine at BGI Bayreuth is supported through grant INST 91/315-1 FUGG. We are grateful to Sylvie Demouchy and one anonymous reviewer for their meticulous and thorough reviews. Any surviving errors of omission or commission are entirely ours.
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Invited review article to commemorate the 40th anniversary of the journal.
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Appendix
Nomenclature and definitions
Interface Where two media are in contact we speak of an interface. This term encompasses, solid–liquid, solid–gaseous, gaseous–liquid contacts as well as solid–solid, gas–gas, or liquid–liquid contact zones. Both grain and phase boundaries are interfaces.
Phase boundary Phase boundaries are interfaces between two different solid phases, generally minerals.
Grain boundary The grain boundary defines the interface where two minerals of the same phase are in contact. The only characteristic that varies between the two grains (crystals) is the orientation of the crystal lattice. The grain boundary itself needs five macroscopic parameters for its macroscopic geometry description.
Triple junction / line Three grains of one phase meet to form a line in 3D-space and a point in a 2D section, when interfacial energies are approximately equal this triple junction has 120\(^{\circ }\) angles, typical for soap foam.
Quadrupole junction Four grains of the same phase meet in a nod (Chaim (1997).
Grain boundary structure The atomic configuration that is repetitive along the grain boundary. Different geometric models have been developed to describe grain boundary structures.
Coincidence side lattice model (CSL) Probably, the most successful geometric model that yields the density of coinciding lattice points of two super imposed adjacent crystal lattices. The inverse of coinciding number of lattice sides, n, yields the \(\Sigma\)-value: \(\Sigma = 1/n\).
Grain boundary character distribution (GBCD) The distribution of the grain boundary geometries in their five parameter space for a polycrystalline sample can be described by the GBCD (Watanabe 1979, 1983; Watanabe et al. 1989).
Grain boundary energy The grain boundary energy is an anisotropic property of grain boundaries (e.g. Smith 1948). The anisotropy arises from the different structures of the grain boundaries at the nm-atomic-scale.
Grain boundary width The grain boundary width is a controversial term, that encompasses the structural grain boundary width (Clarke 1979a), but also includes the effective grain boundary width for various processes that can be orders of magnitude larger.
Grain boundary segregation Grain boundaries are preferential sites for segregation of impurities and elements incompatible in the perfect crystal lattice. This results in a thin layer with a chemical composition that differs from the crystal volume. The creep resistance of several non-geological materials generally increases significantly due to grain boundary segregation (Cho et al. 1999; Yasuda et al. 2004; Milas et al. 2008; Harmer 2010), in rare cases also decreases (Yasuda et al. 2004). Segregation can cause variation of electrical conductivity, for example its enhancement in the case of proton doping (Shirpour et al. 2012).
Grain boundary layer and film The terms have been coerced by Clarke in several publications (Clarke 1979a, b, 1987). Film refers to the existence of a chemically and structurally distinct film fully covering all grain boundaries in ceramics. It is noticeable that such films have a wetting angle of \(0^{\circ }\) and are thermodynamically stable.
Grain boundary layer Differs from the film as its properties are much less defined and less well understood and do not meet the full wetting criterion. The term grain boundary layer is used to refer to the chemically and structurally distinct region of the grain boundary that results from the mismatch of the adjacent crystals, segregation of impurities or incompatible elements. Layers can include melted regions that are > 10 nm wide and have bulk melt properties in case of olivine.
Grain boundary pre-melting Pre-melting is a phenomenon where a thin region at the grain boundary melts at a temperature below the bulk melting temperature, or the bulk eutectic (melting) temperature. Experimentally this has been shown for ice, Pb, W doped with Ni and other unary systems, and is reviewed in several articles (Luo and Chiang 2008; Mellenthin et al. 2008). Pre-melting has not been observed in olivine as yet.
Complexion Grain boundary films and layers can often be regarded as interface-stabilised phases that are thermodynamically stable and have distinct structural and chemical properties with temperature- (Kelly et al. 2016) and pressure-dependent transitions. These interface-stabilised phases are called complexions. In recent years, grain boundary complexions gained more and more interest in material sciences (Rohrer 2011b; Bojarski 2014). However in geology, complexions have not yet been described as general grain boundary features might, however, occur and if we interpret the term widely they encompass quasi-crystalline materials which are treated as interface phenomena theoretically by Romeu et al. (1999) have been observed associated with olivine in Khatyrka meteorite (Bindi et al. 2015), however, not explicitly as interface phase. Note that complexions may not be of first-order importance as geological relevant materials are usually chemically highly complex, probably inhibiting the formation of complexions or resulting in such a high variability of complexions that their identification and study might prove difficult or impossible. For the sake of completeness, we like the reader to note that complexions have been shown to affect grain growth (Dillon et al. 2010) as well as sintering behaviour (Luo and Chiang 2008; Luo 2012).
Note that some of the above terms are partially interchangeable and have evolved during the years. The literature of interfaces, grain- and phase boundaries tries to categorise a subject with fluent boundaries; thus, the nomenclature is partially fluent as well.
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Marquardt, K., Faul, U.H. The structure and composition of olivine grain boundaries: 40 years of studies, status and current developments. Phys Chem Minerals 45, 139–172 (2018). https://doi.org/10.1007/s00269-017-0935-9
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DOI: https://doi.org/10.1007/s00269-017-0935-9