# The thermal expansion of calcite from room temperature up to 400°C

01 Aug 1955-Vol. 42, Iss: 2, pp 81-85

About: The article was published on 1955-08-01. It has received 14 citations till now. The article focuses on the topics: Calcite & Thermal expansion.

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TL;DR: In this article, the temperature dependence of the elastic constants of calcite has been investigated by the ultrasonic phase-comparison method from 25° to 375°C, and the results of the present investigation are in agreement with the other related high-temperature studies of calcites.

Abstract: The temperature dependence of the elastic constants of calcite have been investigated by the ultrasonic phase‐comparison method from 25° to 375°C. The variation in the elastic constants and the elastic moduli of calcite is smooth and linear over the temperature range, and does not show the break in the variation of the elastic moduli with temperature reported by Reddy and Subrahmanyam at 200°C. The results of the present investigation are in agreement with the other related high‐temperature studies of calcite. The reported discontinuity in the variation of elastic moduli with temperature thus seems to be inconsistent with the high‐temperature behavior of calcite. This conviction is strengthened by the impossible behavior of compressibility of calcite with temperature as obtained from the calcite data of Reddy and Subrahmanyam. The elastic constants of calcite at T°C within the temperature range of the present work are adequately represented by the following equations: C11=14.7994−57.82×10−4×(T−25)C33=8.5694−14.06×10−4×(T−25)C44=3.2790−14.36×10−4×(T−25)C66=4.6316−14.03×10−4×(T−25)C13=5.4540−25.76×10−4×(T−25) C14=−2.0966+8.32×10−4×(T−25).

61 citations

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TL;DR: In this article, the authors investigated the variability in the elastic constants of calcite in the range of 160° to 300°K by the ultrasonic phase-comparison method.

Abstract: Variation in the elastic constants of calcite in the range of 160° to 300°K has been investigated by the ultrasonic phase‐comparison method. The values of the elastic constants and the elastic compliances of calcite vary linearly over the temperature range, and thus are in disagreement with the nonlinear behavior of the elastic compliances of calcite between 90° and 273°K reported by Ramamurthy and Reddy (R and R). It is suggested that this discrepancy in the two results is likely to be due to the inconsistent vibrational data of R and R and the impossible behavior of the compressibility of calcite with temperature as obtained from their estimates of the elastic compliance values of calcite. The present investigation also indicates that the variation in the volume compressibility of calcite is primarily due to the variation in linear compressibility of calcite perpendicular to its optic axis, and the temperature dependence of all the elastic constants except for C44 are explicitly due to the temperature c...

47 citations

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Academia Sinica

^{1}TL;DR: The elastic properties of calcite have been determined by Brillouin spectroscopy for temperatures up to 600°C as mentioned in this paper, which indicates a nearly constant Poisson's ratio (0.23 - 0.0097) for calcite from 22 to 600 °C.

Abstract: The elastic properties of calcite have been determined by Brillouin spectroscopy for temperatures up to 600 °C. The results reveal that the variations of the aggregate bulk (K
VRH) and shear (G
VRH) moduli of calcite with respect to temperature can be approximately expressed as follows:
$$\begin{aligned} K_{{{\text{VRH}}}} ({\text{GPa}}) & = 79.57-0.0230\;T\, (T\;{\text{in}}\;^{^\circ } {\text{C}}) \\G_{{{\text{VRH}}}} ({\text{GPa}}) & = 32.23 - 0.0097\;T. \\\end{aligned}$$
This indicates a nearly constant Poisson’s ratio (0.322) for calcite from 22 to 600 °C. A further analysis shows that the compressibility along the c axis (β
||) and that perpendicular to the c axis have comparable contributions to the volume compressibility of calcite, although the contribution of β
|| decreases with an increase in the temperature.

36 citations

### Cites methods from "The thermal expansion of calcite fr..."

...By using the old thermal expansion data reported in Srinivasan (1955), they attributed the change in the slope of all Sij–temperature (T) plots to an internal change at 150–200 C (Reddy and Subrahmanyam 1960)....

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TL;DR: Microstructures and textures of calcite mylonites from the large-scale shearzone in southwestern Switzerland develop principally as a function of extrinsic physical parameters as discussed by the authors.

22 citations

##### References

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01 Sep 1945TL;DR: In this article, the Raman spectrum of aragonite crystal has been photographed using λ2536·5 excitation and 25 frequency shifts have been recorded as compared to 17 observed previously.

Abstract: The Raman spectrum of aragonite crystal has been photographed using λ2536·5 excitation. 25 Frequency shifts have been recorded as compared to 17 observed previously. They are distributed as follows: five due to the internal oscillation of the CO3 ion, fourteen due to lattice oscillation and six belonging to the second order spectrum. The latter have been assigned as some of the octaves and combinations of the fundamental frequencies of vibration of the aragonite structure.

23 citations

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TL;DR: In this paper, the Ubereinstimmung der auf makroskopischem and rontgenographischem Wege gewonnenen Dichten von Einkristallen is studied.

Abstract: Die Arbeit beschaftigt sich mit der Frage der Ubereinstimmung der auf makroskopischem und rontgenographischem Wege gewonnenen Dichten von Einkristallen. Zwischen 20 und 600° C ist die Gitterdehnung von reinen und Ca-haltigen KCl-Kristallen mit einer Prazisions-Rontgenmethode gemessen worden. Ein Vergleich mit vorhandenen makroskopischen Meswerten zeigt Ubereinstimmung der beiden Dichten innerhalb der Fehlergrenze der makroskopischen Messungen. Eine Abweichung der Dichten bei 600° C mus kleiner als 1,5‰ sein. Formeln fur die experimentell gefundene Abhangigkeit 1. der Gitterkonstante, 2. der linearen Ausdehnung, 3. des linearen thermischen Ausdehnungskoeffizienten von KCl zwischen 20 und 600° C werden angegeben.

19 citations