Limits of isomorphous substitution of CnH2n+2 chains in paraffins as a function of temperature

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Limits of isomorphous substitution of CnH2n+2 chains in paraffins as a function of temperature. / Filatov, S. K.; Kotelnikova, E. N.; Golynskaya, O. A.

In: Zeitschrift fur Kristallographie - New Crystal Structures, Vol. 188, No. 3-4, 01.01.1989, p. 161-167.

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Author

Filatov, S. K. ; Kotelnikova, E. N. ; Golynskaya, O. A. / Limits of isomorphous substitution of CnH2n+2 chains in paraffins as a function of temperature. In: Zeitschrift fur Kristallographie - New Crystal Structures. 1989 ; Vol. 188, No. 3-4. pp. 161-167.

BibTeX

@article{8d9a74a814dd4fdd8159e0eac1ca6482,

title = "Limits of isomorphous substitution of CnH2n+2 chains in paraffins as a function of temperature",

abstract = "Synthetic solid solutions of n-paraffins C23H48and C21h44 have been studied by the thermoroentgenographic method. It is shown that the limits of isomorphous substitutions of molecules in these paraffins with molecular ratios C23: C21 = 1:2, 1:1 and 2:1 are temperature dependent. At rising temperatures all solid solutions first break down to form two phases which coexist in a narrow temperature range (3 –5°C) and then become homogeneous at further elevation of temperature. Isomorphism in the system is established to be violated in the course of intensive structural rearrangements; it gets restored shortly (7 – 9° C) before the orthorhombic-hexagonal polymorphic transformation. A decrease in the limits of isomorphous substitutions which occurs at rising temperatures is explained by differences in energy states of paraffin chains having different lengths: relatively long chains oscillate about their own axes whereas shorter chains perform complete rotations and get “separated” from solid solutions.",

keywords = "Isomorphous substitution, Paraffins /",

author = "Filatov, {S. K.} and Kotelnikova, {E. N.} and Golynskaya, {O. A.}",

year = "1989",

month = jan,

day = "1",

doi = "10.1524/zkri.1989.188.3-4.161",

language = "немецкий",

volume = "188",

pages = "161--167",

journal = "Zeitschrift f{\"u}r Kristallographie. New crystal structures",

issn = "1433-7266",

publisher = "De Gruyter",

number = "3-4",

}

RIS

TY - JOUR

T1 - Limits of isomorphous substitution of CnH2n+2 chains in paraffins as a function of temperature

AU - Filatov, S. K.

AU - Kotelnikova, E. N.

AU - Golynskaya, O. A.

PY - 1989/1/1

Y1 - 1989/1/1

N2 - Synthetic solid solutions of n-paraffins C23H48and C21h44 have been studied by the thermoroentgenographic method. It is shown that the limits of isomorphous substitutions of molecules in these paraffins with molecular ratios C23: C21 = 1:2, 1:1 and 2:1 are temperature dependent. At rising temperatures all solid solutions first break down to form two phases which coexist in a narrow temperature range (3 –5°C) and then become homogeneous at further elevation of temperature. Isomorphism in the system is established to be violated in the course of intensive structural rearrangements; it gets restored shortly (7 – 9° C) before the orthorhombic-hexagonal polymorphic transformation. A decrease in the limits of isomorphous substitutions which occurs at rising temperatures is explained by differences in energy states of paraffin chains having different lengths: relatively long chains oscillate about their own axes whereas shorter chains perform complete rotations and get “separated” from solid solutions.

AB - Synthetic solid solutions of n-paraffins C23H48and C21h44 have been studied by the thermoroentgenographic method. It is shown that the limits of isomorphous substitutions of molecules in these paraffins with molecular ratios C23: C21 = 1:2, 1:1 and 2:1 are temperature dependent. At rising temperatures all solid solutions first break down to form two phases which coexist in a narrow temperature range (3 –5°C) and then become homogeneous at further elevation of temperature. Isomorphism in the system is established to be violated in the course of intensive structural rearrangements; it gets restored shortly (7 – 9° C) before the orthorhombic-hexagonal polymorphic transformation. A decrease in the limits of isomorphous substitutions which occurs at rising temperatures is explained by differences in energy states of paraffin chains having different lengths: relatively long chains oscillate about their own axes whereas shorter chains perform complete rotations and get “separated” from solid solutions.

KW - Isomorphous substitution

KW - Paraffins /

UR - http://www.scopus.com/inward/record.url?scp=0012313101&partnerID=8YFLogxK

U2 - 10.1524/zkri.1989.188.3-4.161

DO - 10.1524/zkri.1989.188.3-4.161

M3 - статья

AN - SCOPUS:0012313101

VL - 188

SP - 161

EP - 167

JO - Zeitschrift für Kristallographie. New crystal structures

JF - Zeitschrift für Kristallographie. New crystal structures

SN - 1433-7266

IS - 3-4

ER -

ID: 35628814