BIOVIA MATERIALS STUDIO
MORPHOLOGYDATASHEETBIOVIA Materials Studio Morphology allows you to predict
crystal morphology from the atomic structure of a crystal. The
bulk shape of crystals is critically important to many industrial
processes.

THE BIOVIA MATERIALS STUDIO ADVANTAGE

There are numerous examples in the chemical andpharmaceutical industries where crystal shape may affect thefollowing:

BIOVIA Materials Studio Morphology is operated within BIOVIA
Materials Studio®. The integrated model building and editing
tools in BIOVIA Materials Studio enable you to construct,visualize, and manipulate molecular structures in an asymmetricunit or structures of crystallization solids (e.g. drugs, pigments,
metal oxides, and zeolites).

• Dissolution rate of chemicals and biological availability ofdrugs.
• Handling, packaging, and storage of crystalline products.
• Slurry handling, caking, and filtration during processing.
• Milling, grinding, fragmentation, and dusting• Density and texture optimization.
• Wax and scale formation in petrochemicals.

A crystal graph describes interactions between molecularfragments in a crystal structure can be overlaid on the crystal
structure with BIOVIA Materials Studio Visualizer, or be
displayed as tabular data in a grid document. The crystal graphprovides a powerful tool for analyzing the crystal morphology
and the stability of crystal surfaces in terms of inter-molecularinteractions within the bulk crystal.

The relationship between the crystal morphology and theinternal arrangement of atoms in the crystal is therefore ofgreat interest to chemists, chemical engineers, and processengineers. Rationalization of this relationship allows theprediction of crystal shape, the development of tailor-madeadditives, and the control of solvent and impurity effects.
BIOVIA Materials Studio Morphology’s application areas include
pharmaceuticals, agrochemicals, food sciences, petrochemicals,
cements, and commodity and specialty chemicals.

WHAT DOES BIOVIA MATERIALS STUDIO
MORPHOLOGY DO?
BIOVIA Materials Studio Morphology has been developed
to predict the external morphology of a crystalline material
from its internal crystal structure. Three different methods
are available to deduce morphology through an easy-to-use
interface:
1. Bravais-Friedel Donnay-Harker (BFDH) method1,2 uses the
crystal lattice and symmetry to generate a list of possible
growth faces and their relative growth rates.
2. The growth morphology method3,4 assumes that the growthrate of a crystal face is proportional to its attachment energy(the energy released on attachment of a growth slice to a
growing crystal surface).
3. The equilibrium morphology5 of a crystal is determined by
the minimum of the surface energies for all relevant crystal
faces at zero Kelvin.

The predicted crystal morphology of the most stable
polymorph of CAPP (chloramphenicol-3-palmitate).

Growth faces suggested by the BIOVIA Materials Studio
Morphology can be analyzed using BIOVIA Materials Studio’s
new spreadsheet-like table (called a study table) environment.
The study table combines an easy association of surface
structures with surface properties (e.g. HKL, multiplicity, Dhkl,
surface area, center-to-plane distance, energy for each surface,
the percentage surface area accounted by certain facets) withpowerful sorting and plotting functionality. Polar surfaces canbe identified along with their energy contributions. The study
table also provides a flexible and convenient way to evaluate
additional structural properties for developing quantitative
structure-property relationship models.

Crystal morphology and the relationship between the external
morphology and its underlying internal crystal structure
can be rationalized with BIOVIA Materials Studio Visualizer.
Growth faces can be manipulated by simple mouse actions
to interactively study the dependence of the morphology
on growth rate changes. The most important morphology
properties (e.g. interplanar angles, aspect ratio, total volume,and surface area) are stored in a grid document (one or more
sets of tabular data) in BIOVIA Materials Studio.
Surface chemistry can be further explored using molecularmechanics tools (BIOVIA Materials Studio Discover®, BIOVIA
Materials Studio Forcite, and BIOVIA Materials Studio Compass)or quantum mechanics tools (BIOVIA Materials Studio DMoL3
or BIOVIA Materials Studio CASTEP). Results can be easily
shared with colleagues and copied to standard word processors,
spreadsheet, and presentation packages.

HOW DOES BIOVIA MATERIALS STUDIO
MORPHOLOGY WORK?
The BFDH method combines the Donnay-Harker2 rules toisolate the likely growth planes, and then the Bravais-Friedel
rules1 to deduce their relative growth rates. The method is anapproximation and does not account for the energetics of thesystem. The stronger the bonding effects in the crystal, the lessaccurate the method becomes. In many cases, however, you
can get good approximations, and the method is always usefulfor identifying important faces in the growth process.
The growth morphology method assumes that the growth rateof the crystal face is proportional to its attachment energy;
that is, faces with the lowest attachment energies are theslowest growing and, therefore, have the most morphologicalimportance. The attachment energy is calculated for a seriesof suitable slices (h k l) that are chosen either by performing a
Donnay- Harker prediction2 or by entering your own data. Fromthe energy calculation and, hence, the growth rate, a center-toplane distance is assigned to each face. This information is used
to deduce the morphology using a Wulff plot6.
The equilibrium morphology method calculates the surface energy
using a predefined finite and fixed slab thickness at a temperatureof 0 K. The surface energy is an average between the surfaces with
Miller indices {h k l} and {-h -k -l}. The latter restriction is importantfor crystal structures that do not have a center of inversion.
Instead of performing an energy calculation as part of the
BIOVIA Materials Studio Morphology calculation, the Crystal
Graph functionality can be used to create interactions between
molecular fragments in a crystal. The bond energies for allthese interactions are then calculated, and used as input for
Growth morphology or Equilibrium morphology to determine
the habit of a crystal.

HOW BIOVIA MATERIALS STUDIO MORPHOLOGYBENEFITS YOU?
BIOVIA Materials Studio Morphology allows researchers bothto study particle shape and to consider the effects of altering
the growth rate of particular faces on crystal morphology. Thismay help to estimate to the effect of tailor-made additives
in modifying growth. Knowledge of shape and aspect ratio isessential to understanding packing, flow problems, clogging offilters, and other problems. BIOVIA Materials Studio Morphology
can also provide insight into other properties, such as the
texture of powders and polymorphism.

WITH BIOVIA MATERIALS STUDIO MORPHOLOGY,YOU ARE ABLE TO:• Understand structural reasons for morphology as you predict
crystal habit from crystal structure and analyze relevant
growth faces.
• Relate predicted morphology to experiment, enablingindexing of experimental data.
• Consider the effects of tailor-made additives and solvents byidentifying important interactions at key growth faces.
• Predict the morphological effects of modifying the growth
rates of particular faces.
• Take an essential step towards preferential crystallization ofmetastable polymorphs.
BIOVIA Materials Studio Morphology provides researchers witha fast pathway for the application of computational techniques
to solve real crystallization problems.

FEATURES
Setup• The initial crystal structure can easily be imported from othersources or created using the Crystal Builder within BIOVIA
Materials Studio Visualizer.
• A variety of force fields, as well as quantum mechanics
techniques, are available for calculating atomic charges
and crystal geometries providing flexibility in geometry
optimization.
• Crystals with more than one molecule in the asymmetric unit
can be considered.
• Multiple default settings allow for simple operations, oradvanced users can adjust individual simulation parameters
as necessary.

CALCULATION FEATURES

Analysis• Create crystal graph for organic crystals from the atomic
crystal structures.
• Create crystal graph for inorganic systems without infinite
network of bonded atoms.
• Crystal graph interaction energies may be edited manually to
explore quickly the effect of interaction changes on crystal
morphology.
• Predict morphology of organic7, 8 crystals from the atomic
crystal structures.
• Predict morphology of inorganic systems9 without infinite
network of bonded atoms using the growth morphology orequilibrium morphology method. The BFDH method, on theother hand, can be applied to all inorganic crystal systems.
• Bravais-Friedel Donnay-Harker geometrical rules are used todetermine the likely growth faces.
• Attachment energy calculations are performed to estimate
the relative growth rate of each face, resulting in the growthshape of a crystal.
• Surface energy calculations predict the morphology thatminimizes the total surface energy of a crystal, i.e., theequilibrium morphology.
• Fully implemented BIOVIA Materials Studio Forcite engine
including two dimensional Ewald summation for moreaccurate energy calculations.
• Predict growth morphology or equilibrium morphology of acrystal based on its crystal graph.
• Calculate attributes of a crystal graph (atomic compositionsof molecule pairs involved in an interaction, their symmetry
multiplicity, center-to-center lengths, and bond energies).
• Calculate attributes of a crystal morphology (interplanarangels, aspect ratios, surface area, volume)• Calculate attributes of a crystal surface (multiplicity, Dhkl,
surface area, energy, polarity, effective surface charge,
centerto-plane distance)• Automatic cleaving functionality for all crystal surfaces or
stable surfaces only. Atomistic surface models of arbitrary
substrate thickness can be generated.

• Display 3D graphic image of a crystal graph.
• A crystal graph can be displayed overlaid on the crystal
structure.
• The display style, transparency, and color of the molecules ina crystal graph can be controlled.
• The display style and color of the molecular interactions in a
crystal graph can be manipulated.
• Molecules in a crystal graph can be label with properties
such as cell formula and molecular center, whereas molecularinteractions can be labeled with potential energy, electrostatic
energy, hydrogen-bond energy, length, midpoint.
• Molecular interactions in a crystal graph can be filtered byenergy cutoffs.
• Display 3D graphic image of a crystal morphology.
• The atomistic structure can be displayed with its external
morphology.
• The transparency and color of the crystal faces can becontrolled.
• The relative growth rate of each face can be changed
interactively to analyze the effects of solvents, additives, andimpurities on particle shape.
• Crystal faces can be labeled with properties like Miller indicesand relative surface area.
• Analysis of surface structures and their properties is carriedout with the help of a spreadsheet-like table, called the study
table.
• Each surface structure is embedded in the study table, which
can be viewed independently and displayed along withvarious properties.
• Surface structures in a study table can be sorted according
to one or more properties, e.g. center-toplane distance,
attachment energy, or surface energy.
• A user specified subset can be filtered out from a study table
into a new table.
• Flexible graph plotting enables plotting properties against
each other, and plotting to a selected subset.
• All or part of a study table or a grid document can be copiedand pasted into Microsoft Excel® and Microsoft Word®.
• An interactive, dynamic link is enabled between any growth
face or habit facet of a predicted morphology in a crystal
habit document and its corresponding study table document
providing detailed tabular views of properties for each growth
face or habit facet.
• Structures, crystal graphs, and morphologies can be exported
to bitmap files, and also be printed on grayscale or color
PostScript printers.

Running Jobs
• The crystal graph is generated synchronously on local BIOVIA
Materials Studio clients.
• All BIOVIA Materials Studio Morphology jobs are run in the
background freeing up the BIOVIA Materials Studio client forother research.
• All BIOVIA Materials Studio Morphology jobs can besubmitted to local or remote compute servers.

Results• Crystal graph and its corresponding atomic crystal structuresare stored in a single 3D structure files.
• Crystal graph attributes are stored in a grid document.
• Crystal morphology and its corresponding atomic crystal
structure are stored in a single 3D structure file.
• Surface attributes including atomistic surface models are
stored in a study table.
• BIOVIA Materials Studio Morphology attributes are stored ina grid document.
• Parameter settings are automatically saved for eachsimulation.

Typical Applications• Explore the effect of the intermolecular interaction strength
on the crystal morphology.
• Provide knowledge of shape and aspect ratio, which areessential for understanding packing, flow problems, clogging
of filters, and other problems in processing, handling, andformulation.
• Analyze surface chemistry and consider the effects oftailormade additives, impurities, and solvents.
• Provide insight into many other problems such as the textureof powders and dense packing.
• Examine why certain crystal faces are more stable thanothers.

SYSTEM DETAILS
Operated through the BIOVIA Materials Studio user interface on
Windows® 2000 and XP, BIOVIA Materials Studio Morphology
calculations can be executed on Windows® 2000, 2003, XP,
SGI IRIX, Red Hat Linux (Intel IA32, EM64T, and compatibles),and SuSe Linux (Intel IA32, EM64T, and compatibles) operating
systems.
To learn more about BIOVIA Materials Studio, go toaccelrys.com/materials-studio

REFERENCES:©2014 Dassault Systèmes. All rights reserved. 3DEXPERIENCE, the Compass icon and the 3DS logo, CATIA, SOLIDWORKS, ENOVIA, DELMIA, SIMULIA, GEOVIA, EXALEAD, 3D VIA, BIOVIA and NETVIBES are commercial trademarks
or registered trademarks of Dassault Systèmes or its subsidiaries in the U.S. and/or other countries. All other trademarks are owned by their respective owners. Use of any Dassault Systèmes or its subsidiaries trademarks is subject to their express written approval.

1. A. Bravais, Etudes Crystall-ographiques, Academie des Sciences, Paris (1913).
2. J.D.H. Donnay and D. Harker, Amer. Mineralogist, 22, 463 (1937).
3. Z. Berkovitch-Yellin, J. Am. Chem. Soc., 107, 8239 (1985).
4. R. Docherty, G. Clydesdale, K. J. Roberts, P. Bennema,.J. Phys. D: Appl. Phys., 24, 89 (1991).
5. J.W. Gibbs, Collected Works, Longman, New York (1928).
6. G.Wulff, Z. Krystallogr., 34: 449 (1901).
7. R. Buller, M.L. Peterson, O. Almarsson, L. Leiserowitz, Cryst. Growth & Design, 2, 553-562 (2002).
8. A.Y. Lee, A. Ulman, A. Myerson, Langmuir, 18, 5886-5898 (2002).
9. P. Coveney and W.Humphries, J. Chem. Soc., Faraday Trans., 92, 831-841(1996).

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