Publications List

Angel RJ (1984) The experimental determination of the johannsenite-bustamite equilibrium inversion boundary. Contributions to Mineralogy and Petrology 85:272-278.

Angel RJ, Price GD, Putnis A (1984) A mechanism for pyroxene-pyroxenoid and pyroxenoid-pyroxenoid transformations. Physics and Chemistry of Minerals 10:236-243.

Angel RJ (1985) The role of planar defects in phase transformation. Ph.D. Thesis, University of Cambridge.

Angel RJ (1985) Structural variation in wollastonite and bustamite. Mineralogical Magazine 49:37-48.

Angel RJ, Price GD, Yeomans J (1985) Energetics of polytypic systems: Further applications of the ANNNI model. Acta Crystallographica B40:310-318

Angel RJ (1986) Transformation mechanisms between single-chain silicates. American Mineralogist 71:1441-1454.

McCormick TC, Hazen RM, Angel RJ (1989) Compressibility of omphacite to 60 kbars: Role of vacancies. American Mineralogist 74:1287-1292.

Angel RJ, Burnham CW (1991) Pyroxene-pyroxenoid polysomatism revisited: A clarification. American Mineralogist 76:900-903.

Angel RJ, Chopelas A, Ross NL (1992) High-density clinopyroxene: a major new upper-mantle phase. Nature 358:322-324.

Hugh-Jones DA, Angel RJ (1994) A compressional study of MgSiO₃ orthoenstatite up to 8.5 GPa. American Mineralogist , 79:405-410.

Hugh-Jones DA, Woodland AB, Angel RJ (1994) The structure of high-pressure C2/c ferrosilite and the crystal chemistry of high-pressure C2/c pyroxenes. American Mineralogist, 79:1032-1041.

Angel RJ, Hugh-Jones DA (1994) Equations of state and thermodynamic properties of enstatite pyroxenes. Journal Geophysical Research , 99:19777-19783.

Hugh-Jones DA, Sharp T, Angel RJ, Woodland AB (1996) The transition of orthoferrosilite to high-pressure C2/c clinoferrosilite at ambient temperature. European Journal of Mineralogy, 8:1337-1345.

Hugh-Jones DA, Angel RJ (1997) The effect of Ca²⁺ and Fe²⁺ on the equations of state and compressional behaviour of MgSiO₃ pyroxenes. Journal Geophysical Research, 102:12333-12340.

Hugh-Jones DA, Chopelas A Angel RJ (1997) Tetrahedral compression in (Mg,Fe)SiO₃ orthopyroxenes. Physics and Chemistry of Minerals , 24:301-310.

Woodland AB, Angel RJ (1997) Reversal of the orthoferrosilite - high-P clinoferrosilite transition, a phase diagram for FeSiO₃ and implications for the mineralogy of the Earth's upper mantle. European Journal of Mineralogy, 9: 245-254.

Woodland AB, McCammon C, Angel RJ (1997) Intersite partitioning of Mg and Fe in Ca-free high-pressure C2/c pyroxene. American Mineralogist, 82:923-930.

Angel RJ, McCammon C, Woodland AB (1998) Structure, ordering and cation interactions in Ca-free P2₁/c clinopyroxene. Physics and Chemistry of Minerals, 25:249-258.

Arlt T, Angel RJ, Miletich R, Armbruster T, Peters T (1998) High pressure P2₁/c - C2/c phase transitions in clinopyroxenes: Influence of cation size and electronic structure. American Mineralogist, 83: 1176-1181.

Arlt T, Kunz M, Stolz J, Armbruster T, Angel RJ (2000) P-T-X data on P2₁/c clinopyroxenes and their displacive phase transitions. Contributions to Mineralogy and Petrology, 138:35-46.

Arlt T, Angel RJ (2000) Displacive phase transitions in C-centred clinopyroxenes: spodumene, LiScSi₂O₆ and ZnSiO ₃. Physics and Chemistry of Minerals, 27:719-731.

Angel RJ, Hazen RM, McCormick TC, Prewitt CT, Smith JA (1988) Compressibility of end-member feldspars. Physics and Chemistry of Minerals 15:313-318.

Angel RJ (1988) High pressure structure of anorthite. American Mineralogist 73:1114-1119.

Angel RJ, Redfern SAT, Ross NL (1989) Spontaneous strain below the I-1 = P-1 transition in anorthite at pressure. Physics and Chemistry of Minerals, 16:539-544.

Angel RJ, Carpenter MA, Finger, LW (1990) Structural variation associated with compositional variation and order-disorder behaviour in anorthite-rich feldspars. American Mineralogist 75:150-162.

Carpenter MA, Angel RJ, Finger, LW (1990) Calibration of Al/Si order variations in anorthite. Contributions to Mineralogy and Petrology 104:471-480.

Hackwell TP, Angel RJ (1992) The compressibilities of boron feldspars and their aluminium analogues. European Journal of Mineralogy 4:1221-1227.

Angel RJ (1992) Order-disorder and the high-pressure P-1-I-1 transition in anorthite. American Mineralogist 77:923-929

Angel (1994) Feldspars at high pressure. In: Parsons (Ed) "Feldspars and their Reactions", pp271-312, NATO ASI vol C421.

Hackwell TP, Angel RJ (1994) Reversed brackets for the P-1 = I-1 transition in anorthite at high pressures and temperatures. American Mineralogist, 80:239-246.

Allan DR, Angel RJ (1997) A high-pressure structural study of microcline (KAlSi₃O₈) to 7 GPa. European Journal of Mineralogy, 9:263-275.

Angel RJ (1993) The high-pressure, high-temperature equation of state of calcium fluoride, CaF₂. Journal of Physics: Condensed Matter 5:L141-144.

Christy AG, Angel RJ, Haines J, Clark SM (1994) Crystal structure variation and phase transition in caesium trichlorocuprate at high pressure. J Physics: Condensed Matter 6:3125-3136.

Christy AG, Angel RJ (1995) A model for the origin of the cell doubling transitions in clinopyroxene and body-centered anorthite. Physics and Chemistry of Minerals, 22:129-135.

Angel RJ, Ross NL (1996) Compression mechanisms and equations of state. Philosophical Transactions of the Royal Society A 354:1449-1459.

Angel RJ (1996) New phenomena in minerals at high pressures. Phase Transitions, 59:105-119.

Angel RJ (1997) The Earth's mantle remodelled. Nature, News and Views, 385:490-491.

Angel RJ (1997) Transformation of fivefold-coordinated silicon to octahedral silicon in calcium silicate, CaSi₂O ₅. American Mineralogist, 82:836-839.

Allan DR, Kelsey AA, Clark SJ, Wu ZY, Ouvrard G, Angel RJ, Ackland GJ (1998) High-pressure semiconductor - semimetal transition in TiS₂. Physics Review B, 57:5106-5110.

Miletich R, Allan DR, Angel RJ (1998) Structural control of polyhedral compression in synthetic braunite, Mn²⁺Mn³⁺ ₆SiO₄. Physics and Chemistry of Minerals, 25:183-192.

Miletich R, Seifert F, Angel RJ (1998) Compression of cadmium orthosilicate Cd₂SiO₄: A high-pressure single-crystal study. Zeitschrift für Kristallographie, 213:288-295.

Angel RJ, Kunz M, Miletich R, Woodland AB, Koch M, Knoche R (1999) Effect of isovalent Si,Ti substitution on the bulk moduli of Ca(Ti _1-xSi_x)SiO₅ titanites. American Mineralogist, Prewitt Volume, 84:282-287.

Ross NL, Angel RJ (1999) Compression of CaTiO₃ and CaGeO₃ perovskites. American Mineralogist, Prewitt Volume, 84:277-281.

Angel RJ, Kunz M, Miletich R, Woodland AB, Koch M, Xirouchakis D (1999) High-pressure phase transition in CaTiOSiO₄ titanite. Phase Transitions, 68, 533-543.

Redfern SAT, Angel RJ (1999) High-pressure behaviour and equation of state of calcite, CaCO₃. Contributions to Mineralogy and Petrology, 134:102-106.

Warren MC, Redfern SAT, Angel RJ (1999) Change from six-fold to five-fold coordination of silicate polyhedra: Insights from first-principles calculations of CaSi₂O₅. Physical Review B, 59:9149-9154.

Miletich R, Angel RJ (1999) Phase transitions and equations of state. In: Wright K., Catlow R. (Eds) NATO Science Series volume C543 "Microscopic processes in Minerals", pp 477-492

Miletich R, Nowak M, Seifert F, Angel RJ (1999) High-pressure crystal chemistry of chromous orthosilicate, Cr₂SiO₄ . A single-crystal X-ray diffraction and electronic absorption spectroscopy study. Physics and Chemistry of Minerals, 26:446-459.

Angel RJ, Bismayer U (1999) Renormalisation of the phase transition in lead phosphate, Pb₃(PO₄)₂ , by high pressure: lattice parameters and spontaneous strain. Acta Crystallographica B 55:896-901

Woodland AB, Angel RJ, Koch M, Kunz M, Miletich R (1999) Equations of state for Fe²⁺₃Fe³⁺₂ Si₃O₁₂ "skiagite" garnet and Fe₂SiO ₄-Fe₃O₄ spinel solid solutions. Journal of Geophysical Research, B104:20049-20058.

Brunet F, Allan DR, Redfern SAT, Angel RJ, Miletich R, Reichmann H, Hanfland M, Sergent J (1999) Compressibility and thermal expansivity of synthetic apatites, Ca₅(PO₄)₃X with X= OH, F and Cl. European Journal of Mineralogy, 11:1023-1035.

Boffa-Ballaran T, Angel RJ, Carpenter MA (2000) High pressure transformation behaviour of the cummingtonite-grunerite solid solution. European Journal of Mineralogy 12:1195-1213.

Angel RJ (2000) High-pressure powder diffraction. In: Dinnebier RE (Ed) "Structure determination and refinement from powder diffraction data" Berichte aus Arbeitskreisen der Deutsche Gesselschaft für Kristallographie, v9, pp 209-228.

Smyth JR, Jacobsen SD, Swope RJ, Angel RJ, Arlt T, Domanik K, Holloway JR (2000) Crystal structures and compressibilities of synthetic 2M₁ and 3T phengite micas. European Journal of Mineralogy, 12:955-964.

Angel RJ, Frost DJ, Ross NL (2000) Stabilities and equations of state of dense hydrous magnesium silicates. Physics of the Earth and Planetry Interiors, in press.

Kung J, Angel RJ, Ross NL (2001) Elasticoty of CaSnO ₃ perovskite. Physics & Chemistry of Minerals, 28:35-43.

Angel RJ, Mosenfelder JL, Shaw CSJ (2001) Anomalous compression and equation of state of coesite. Physics of the Earth and Planetry Interiors, 124:71-79.

Angel RJ, Bismayer U, Marshall WG (2001) Renormalisation of the phase transition in lead phosphate, Pb₃(PO₄ ) ₂, by high pressure: structure. Journal of Physics C: Condensed Matter, submitted.

Ross NL, Angel RJ, Seifert F (2001) Compressibility of Brownmillerite, Ca₂Fe₂O₅: Effect of Vacancies on the Elastic Properties of Perovskites. Physics of the Earth and Planetry Interiors, submitted.

Angel RJ, Ross NL, Wood IG, Woods PA (1992) Single crystal X-ray diffraction at high pressures with diamond-anvil cells. Phase Transitions 39:13-32.

Allan DR, Miletich R, Angel RJ (1996) A diamond-anvil cell for single-crystal X-ray diffraction studies to pressures in excess of 10 GPa. Reviews of Scientific Instruments, 67:840-842.

Angel RJ, Ross NL (1997) Equations of state of mantle minerals from high-pressure diffraction. Physics & Chemistry of the Earth, 22:119-123.

Angel RJ, Allan DR, Miletich R, Finger LW (1997) The use of quartz as an internal pressure standard in high-pressure crystallography. Journal of Applied Crystallography, 30:461-466.

Shen AH, Reichmann H-J, Chen G, Angel RJ, Bassett WA, Spetzler H (1997) Gigahertz ultrasonic interferometry in a diamond anvil cell: P-wave velocities in periclase to 4.4 GPa and 207^o C. In: Properties of Earth and Planetary Materials at High Pressure and Temperature, Manghanni (Ed). AGU Geophysical Monograph 101, pp71-77.

Reichmann HJ, Angel RJ, Spetzler H, Bassett WA (1998) Ultrasonic interferometry and X-ray measurements on MgO in a new diamond anvil cell. American Mineralogist, 83:1357-1360.

Arlt T, Angel RJ (2000) Pressure buffering in a diamond anvil cell. Mineralogical Magazine, 64:241-245.

Bassett WA, Reichmann HJ, Angel RJ, Spetzler H, Smyth J (2-000) New diamond-anvil cells for gigaherz ultrasonic interferometry and X-ray diffraction. American Mineralogist, 85:283-287.

Angel RJ (2000) High-pressure structural phase transitions. In: Redfern SAT (Ed) "Transformation processes in Minerals" MSA Reviews in Mineralogy and Geochemistry, v39, pp 85-104.

Angel RJ, Downs RT, Finger LW (2001) Diffractometry. In Hazen, R.M., Downs, R.T. (Eds.), High-pressure, high-temperature crystal chemistry. Reviews in Mineralogy and Geochemistry, 41, in press.

Putnis A, Angel RJ (1985) Al,Si ordering in cordierite using "magic angle spinning" NMR. II: Models of Al,Si order from NMR data. Physics and Chemistry of Minerals 12:217-222.

Angel RJ (1986) Polytypes and polytypism. Zeitschrift für Kristallographie 176:193-204.

Angel RJ, Finger LW (1988) Polymorphism of nickel sulphate hexahydrate, NiSO₄.6H₂O. Acta Crystallographica C44:1869-1873.

Angel RJ, Gasparik T, Ross NL, Finger LW, Prewitt CT, Hazen RM (1988) A silica-rich sodium pyroxene phase with six-coordinated silicon. Nature 333:156-158.

Angel RJ, Finger LW, Hazen RM, Kanzaki M, Weidner DJ, Liebermann RC, Veblen DR (1989) Structure and twinning of single-crystal MgSiO₃ garnet synthesised at 17 GPa and 1800^o C. American Mineralogist 74:509-512.

Angel RJ, Gasparik T, Finger LW (1989) Crystal structure of a Cr²⁺-bearing pyroxene. American Mineralogist 74:599-603.

Roberts AC, Bonardi M, Erd RC, Criddle J, Stanley CJ, Cressey G, Angel RJ, Laflamme JHG (1990) Edgarbaileyite, the first know silicate of mercury, from California and Texas. Mineralogical Record 21:215-220.

Angel RJ, Ross NL, Finger LW, Hazen RM (1990) Ba₃ CaCuSi₆O₁₇: A new {lB,1¹_oo }[⁴Si₆O₁₇] chain silicate. Acta Crystallographica C46:2028-2030.

Angel RJ, Cressey G, Criddle AJ (1990) Edgarbaileyite, Hg₆Si₂O₇: The crystal structure of the first mercury silicate. American Mineralogist 75:1192-1196.

Ross NL, Angel RJ (1991) Crystal structure of high-pressure SrB₂O₄(IV). Journal of Solid State Chemistry 90:27-30.

Chandley P, Clark RJH, Angel RJ, Price GD (1992) Site preference of vanadium doped into ZrSiO₄ and ZrGeO₄ . Journal of the Chemical Society, Dalton Transactions, 1579-1584.

Hayward CL, Angel RJ, Ross NL (1994) The structural redetermination and crystal chemistry of sinhalite, MgAlBO₄. European Journal of Mineralogy 6:313-321.

Angel RJ, Ross NL, Seifert F, Fliervoet TF (1996) Structural characterisation of pentacoordinate silicon in a calcium silicate. Nature , 384:441-444.

Miletich R, Allan DR, Angel RJ (1997) The synthetic Cr ²⁺ silicates BaCrSi₄O₁₀ and SrCrSi₄ O₁₀: the missing links in the gillespite-type ABSi ₄O₁₀ series. American Mineralogist, 82:697-707.

Woodland AB, Angel RJ (1998) Crystal structure of a new spinelloid with the wadsleyite structure in the system Fe₂SiO ₄-Fe₃O₄ and implications for the Earth's mantle. American Mineralogist, 83:404-408.

Schmidt MW, Angel RJ, Finger LW, Dinnebier R (1998) Synthesis, stability and structure of phase egg (AlSiO₃(OH)), a high-pressure hydrous aluminium silicate. American Mineralogist, 83:881-888.

Angel RJ, Woodland AB,(1998) Crystal structure of spinelloid II in the system Fe₂SiO₄-Fe₃O₄ . European Journal of Mineralogy, 10:607-611.

Knoche R, Angel RJ, Seifert F, Fliervoet TF (1998) Complete substitution of Si for Ti in titanite Ca(Ti_1-xSi_x) ^VISi^IVO₅. American Mineralogist, 83:1168-1175.

Chakraborty S, Knoche R, Schulze H, Rubie DC, Dobson D, Ross NL, Angel RJ (1999) Enhancement of cation diffusion rates across the 410-kilometer discontinuity in earth's mantle. Science, 283:362-365.

Gautron L, Angel RJ, Miletich R (1999) Structural characterisation of the high-pressure phase CaAl₄Si₂O₁₁. Physics and Chemistry of Minerals, 27:47-51.

Angel, RJ (1999) Silicon. In: McGraw-Hill 1999 Yearbook of Science and Technology.

Angel RJ, Seifert F (1999) The effect of pressure on cation ordering in minerals: problems and perspectives. Phase Transitions, 69:1-16.

Becerro AI, McCammon C, Langenhorst F, Seifert F, Angel RJ (1999) Oxygen-vacancy ordering in CaTi₁O₃-CaFeO _2.5 perovskites: From isolated defects to infinite sheets. Phase Transitions, 69:133-146.

Miletich R, Angel RJ (1999) Crystal structures at extremes of pressure and temperature. In: Wright K., Catlow R. (Eds) NATO Science Series volume C543 "Microscopic processes in Minerals", pp 1-18.

McCammon C, Becerro AI, Langenhorst F, Angel RJ, Marion S, Seifert F (2000) Short-range ordering of oxygen vacancies in CaFe _xTi_1-xO_3-x/2 perovskites (0 < x < 0.40). Journal of Physics C: Condensed Matter 12:2969-2984.

Becerro AI, Seifert F, Angel RJ, Ríos S, McCammon C (2000) Displacive phase transitions and spontaneous strains in oxygen-deficient CaFe_xTi_1-xO_3-x/2 perovskites (0 < x < 0.40). Journal of Physics C: Condensed Matter 12:3661-3670.

Becerro AI, Langenhorst F, Angel RJ, Marion S, McCammon C, Seifert F (2000) The transition from short-range to long-range ordering of oxygen vacancies in CaFe_xTi_1-xO_3-x/2 perovskites. Journal of Physical Chemistry: Chemical Physics , 2:3933-3941.

Woodland AB, Angel RJ (2000) Phase relations in the system fayalite-magnetite at high-pressures and temperatures. Contributions to Mineralogy and Petrology, 139:734-747.

Angel RJ, Prewitt CT (1986) Crystal structure of mullite: A re-examination of the average structure. American Mineralogist 71:1476-1482.

Angel RJ, Prewitt CT (1987) The incommensurate structure of mullite by Patterson synthesis. Acta Crystallographica B43:116-126.

Angel RJ, McMullan RK, Prewitt CT (1991) Substructure and superstructure of mullite by neutron diffraction. American Mineralogist 76:332-342.

McConnell JDC, McCammon CA, Angel RJ, Seifert F (2000) The nature of the incommensurate structure in Åkermanite, Ca₂ MgSi₂O₇, and the character of its transformation from the normal structure. Zeitschrift für Kristallographie 215:669-677.

Hazen RM, Finger LW, Angel RJ, Prewitt CT, Ross NL, Mao HK, Hadidiacos CG, Hor PH, Meng RL, Chu CW (1987) Crystallographic description of the phases in the Y-Ba-Cu-O superconductor. Physical Review B35:7238-7241.

Ross NL, Angel RJ, Finger LW, Hazen RM, Prewitt CT (1987) Oxygen-defect perovskites and the 93K superconductor. in: "Chemistry of high-temperature superconductors", American Chemical Society Symposium Series, vol 354.

Hazen RM, Prewitt CT, Angel RJ, Ross NL, Finger LW, Hadidiacos CG, Veblen DR, Heaney PJ, Hor PH, Meng RL, Sun YY, Wang YQ, Xue YY, Huang ZJ, Gao L, Bechtold J, Chu CW (1988) Superconductivity in the very high T _c Bi-Ca-Sr-Cu-O system: Phase identification. Physics Review Letters 60: 1174-1177.

Meng RL, Hor PH, Sun YY, Huang ZJ, Gao L, Xue YY, Wang YQ, Bechtold J, Chu CW, Hazen RM, Prewitt CT, Angel RJ, Ross NL, Finger LW, Hadidiacos CG (1988) The 120 K superconducting phase in Bi-Ca-Sr-Cu-O. Modern Physics Letters 2:543-549.

Veblen DR, Heaney PJ, Angel RJ, Finger LW, Hazen RM, Prewitt CT, Ross NL, Chu CW, Hor PH, Meng RL (1988) Crystallography, chemistry and structural disorder in the new high-T_c Bi-Ca-Sr-Cu-O superconductor. Nature 332:334-337.

Hazen RM, Finger LW, Angel RJ, Prewitt CT, Ross NL, Hadidiacos CG, Heaney PJ, Veblen DR, Sheng VV, Ali AE, Hermann AM (1988) 100K superconducting phases in the Tl-Ca-Ba-C-O system. Physics Review Letters 60:1657-1660.

Liu RS, Hughes SD, Angel RJ, Hackwell TP, MacKenzie AP, Edwards PP (1992) Crystal structure and cation stoichiometry of superconducting Tl₂Ba₂CuO_6+δ single crystals. Physica C 198:203-208.

Angel RJ (1998) "Silicon". In: "McGraw-Hill Yearbook of Science and Technology, 1999", Editors: Weil, Felsenfeld, and Martin, McGraw-Hill.

Angel RJ (1999) "X-ray Diffraction". In: "Encyclopedia of Geochemistry", Editors: Marshall and Fairbridge; Kluwer Academic Press.