Twinning (endemic conditions of) - Revision history

BrianMcMahon: Tidied translations.

2017-11-20T14:25:40Z

Tidied translations.

2017-05-17T15:10:54Z

Style edits to align with printed edition

2006-06-25T08:06:59Z

2006-06-23T09:59:00Z

2006-06-23T09:50:27Z

2006-05-16T12:50:38Z

2006-05-16T12:49:36Z

2006-05-16T12:29:07Z

2006-05-16T12:14:13Z

2006-05-16T12:11:13Z

← Older revision		Revision as of 14:25, 20 November 2017
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−	<~~Font~~ color="blue"> Maclage (conditions endémiques)</~~Font~~> (''Fr''). <~~Font~~ color="black"> Geminazione (condizioni endemiche di) </~~Font~~>(''It'').	+	<font color="blue">Maclage (conditions endémiques)</font> (''Fr''). <font color="black">Geminazione (condizioni endemiche di)</font> (''It'').
		+

	When a lattice necessarily contains at least one sublattice that supports either [[twinning by reticular merohedry]] or [[twinning by reticular pseudomerohedry]], it is said that an endemic condition of [[twinning]] does exist. The following cases are known.		When a lattice necessarily contains at least one sublattice that supports either [[twinning by reticular merohedry]] or [[twinning by reticular pseudomerohedry]], it is said that an endemic condition of [[twinning]] does exist. The following cases are known.

@@ Line 1: / Line 1: @@
-<Font color="blue"> Maclage (conditions endémiques)</Font> (''Fr''). <Font color="black"> Geminazione (condizioni endemiche di) </Font>(''It'')
+<Font color="blue"> Maclage (conditions endémiques)</Font> (''Fr''). <Font color="black"> Geminazione (condizioni endemiche di) </Font>(''It'').
 When a lattice necessarily contains at least one sublattice that supports either [[twinning by reticular merohedry]] or [[twinning by reticular pseudomerohedry]], it is said that an endemic condition of [[twinning]] does exist. The following cases are known.
@@ Line 6: / Line 6: @@
 '''Rhombohedral lattice''' (''hR'')
-A ''hR'' lattice (symmetry <math> \bar 3</math>''m'') always contains a ''hP'' lattice (symmetry 6/''mmm''). Consequently, the crystal structures based on a ''hR'' lattice are endemic candidates to twinning by reticular merohedry via the symmetry elements that occur in the 6/''mmm'' point group of the sublattice, but not in the <math> \bar 3</math>''m'' point group of the lattice.
+A ''hR'' lattice (symmetry <math> \bar 3</math>''m'') always contains a ''hP'' lattice (symmetry 6/''mmm''). Consequently, the crystal structures based on a ''hR'' lattice are endemic candidates to twinning by reticular merohedry ''via'' the symmetry elements that occur in the 6/''mmm'' point group of the sublattice, but not in the <math> \bar 3</math>''m'' point group of the lattice.

@@ Line 1: / Line 1: @@
-<Font color="black"> Geminazione (condizioni endemiche di) </Font>(''It'')
+<Font color="blue"> Maclage (conditions endémiques)</Font> (''Fr''). <Font color="black"> Geminazione (condizioni endemiche di) </Font>(''It'')
 When a lattice necessarily contains at least one sublattice that supports either [[twinning by reticular merohedry]] or [[twinning by reticular pseudomerohedry]], it is said that an endemic condition of [[twinning]] does exist. The following cases are known.
@@ Line 16: / Line 16: @@
 '''Pseudo ''cP'' and ''hR'' lattices'''
-The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus their can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value) lattice and favour twinning by pseudo (reticular) merohedry.
+The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus they can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value) lattice and favour twinning by pseudo (reticular) merohedry.

← Older revision		Revision as of 09:59, 23 June 2006
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	'''Pseudo ''cP'' and ''hR'' lattices'''		'''Pseudo ''cP'' and ''hR'' lattices'''

−	The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus their can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value)lattice and favour twinning by pseudo (reticular) merohedry.	+	The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus their can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value) lattice and favour twinning by pseudo (reticular) merohedry.

← Older revision		Revision as of 09:50, 23 June 2006
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	'''Cubic lattices'''		'''Cubic lattices'''

−	The primitive cells of ''cF'' and ''cI'' lattices are rhombohedric (''hR'') lattices with α = 60° and 109.47°, respectively; a ''cP'' lattice can be seen a a rhombohedric lattice with α = 90°. As said above, a ''hP'' sublattice is always embedded in a ''hR'' lattice with consequent possibility of favouring twinning by reticular merohedry.	+	The primitive cells of ''cF'' and ''cI'' lattices are rhombohedric (''hR'') lattices with α = 60° and 109.47°, respectively; a ''cP'' lattice can be seen as a rhombohedric lattice with α = 90°. As said above, a ''hP'' sublattice is always embedded in a ''hR'' lattice with consequent possibility of favouring twinning by reticular merohedry.

@@ Line 2: / Line 2: @@
 When a lattice necessarily contains at least one sublattice that supports either [[twinning by reticular merohedry]] or [[twinning by reticular pseudomerohedry]], it is said that an endemic condition of [[twinning]] does exist. The following cases are known.
 '''Rhombohedral lattice''' (''hR'')
@@ Line 11: / Line 12: @@
 The primitive cells of ''cF'' and ''cI'' lattices are rhombohedric (''hR'') lattices with &alpha; = 60° and 109.47°, respectively; a ''cP'' lattice can be seen a a rhombohedric lattice with &alpha; = 90°. As said above, a ''hP'' sublattice is always embedded in a ''hR'' lattice with consequent possibility of favouring twinning by reticular merohedry.
 '''Pseudo ''cP'' and ''hR'' lattices'''
 The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus their can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value)lattice and favour twinning by pseudo (reticular) merohedry.
 '''Pseudo ''hP'' lattices'''

@@ Line 10: / Line 10: @@
 '''Cubic lattices'''
-The primitive cells of ''cF'' and ''cI'' lattices are rhombohedric (''hR'') lattices with &alpha; = 60° and 109.47°, respectively; a ''cP'' lattice can be seen an a rhombohedric lattice with &alpha; = 90°. As said above, a ''hP'' sublattice is always embedded in a ''hR'' lattice with consequent possibility of favouring twinning by reticular merohedry.
+The primitive cells of ''cF'' and ''cI'' lattices are rhombohedric (''hR'') lattices with &alpha; = 60° and 109.47°, respectively; a ''cP'' lattice can be seen a a rhombohedric lattice with &alpha; = 90°. As said above, a ''hP'' sublattice is always embedded in a ''hR'' lattice with consequent possibility of favouring twinning by reticular merohedry.
-'''Pseudo ''cP'' and ''hR''lattices'''
+'''Pseudo ''cP'' and ''hR'' lattices'''
 The primitive cells of ''oI'' and ''tI'' lattices always have ''a'' = ''b'' = ''c''; thus their can either approach a ''cP'' (all angles close to 90°) or a ''hR'' (all angles close to the same value)lattice and favour twinning by pseudo (reticular) merohedry.
@@ Line 19: / Line 19: @@
 The primitive cells of ''mC'' and ''oC'' lattices have ''a'' = ''b'', a condition which brings into existence a ''hP'' sublattice when &gamma; is about 120°.
 [[Category:Twinning]]